检索结果-内蒙古大学图书馆

Refinement of A356 alloy using continuous rheological extrusion Al-Ti-V-B master alloy

China Foundry 2025年第2期22卷 222-230页

作者： Hong-fei Jia Guang-zong Zhang Shuo Zhang Da Teng Qing He Jun-wen Li Ren-guo Guan Engineering Research Center of Continuous Extrusion Ministry of EducationDalian Jiaotong UniversityDalian 116028LiaoningChina Key Laboratory of Near-Net Forming of Light Metals of Liaoning Province Dalian Jiaotong UniversityDalian 116028LiaoningChina

Based on thermodynamic calculations and continuous rheological extrusion(CRE)technology,Al-Ti-V-B master alloys were designed and *** morphology and the distribution of the refined phases in the master alloys were analyzed by XRD,SEM,and *** effects of master alloy addition and holding time on the microstructure and mechanical properties of A356 alloy were *** the optimum refiner addition of 0.3wt.%and the holding time of 20 min,the average grain size of the refined A356 alloy is 151.8±9.11μm,89.62%lower than that of original A356 *** tensile strength and elongation of as-cast A356refined alloy are 196.11 MPa and 5.75%,*** T6 treatment,the tensile strength and elongation of A356 refined alloy are 290.1 MPa and 3.09%,*** fracture morphology is characterized by a predominance of along-crystal fracture with a small amount of through-crystal fracture,attributed to the refined *** grains promote crack path deflection and localized plastic deformation,enhancing energy dissipation and reducing the tendency for brittle *** study provides a novel approach to improving the mechanical properties of A356 alloy through grain refinement using CRE Al-Ti-V-B master alloy.

关键词： A356 alloy continuous rheological extrusion grain refinement Al-Ti-V-B master alloy mechanical properties

来源：评论

学校读者我要写书评

暂无评论

Achieving the synergistic of strength and ductility in Mg-15Gd-1Zn-0.4Zr alloy with hierarchical structure

引用

Journal of Magnesium and Alloys 2024年第7期12卷 2937-2951页

作者： Kun Jiang Minghang Zhou Haoxin Wu Senzhong Liu Yujuan Wu Yong Liu Key Laboratory of Light weight and High Strength Structural Materials of Jiangxi Province Advanced Manufacturing School of Nanchang UniversityNanchang 330031PR China National Engineering Research Center of Light Alloy Net Forming State Key Laboratory of Metal Matrix CompositeShanghai Jiao Tong UniversityShanghai 200240PR China

Currently,the hierarchical structure is one of the most effective means to enhance the strength and plasticity of metal materials,since the strain localization can be effectively delayed by the coordination of the unique *** this study,a hierarchical structure of Mg-15Gd-1Zn-0.4Zr(GZ151K)alloys containing grain,twin,and precipitation structural units was prepared by ultrasonic surface rolling process(USRP)and recrystallization annealing(RU).The results showed that the stress gradient generated by USRP formed a twin gradient structure,which will activate the twin-assisted precipitation(TAP)effect and twin-induced recrystallization(TIR)effect during ***,the twin gradient structure transformed into a twin-precipitation gradient structure,and finally into a hierarchical structure with grain-twinprecipitation as the increasement of recrystallization ***,the dual gradient structure with twin and precipitation structural units had the highest strength and microhardness owing to the precipitation ***,the hierarchical structure with grain,twin,and precipitation structural units exhibited the most excellent combination of strength and plasticity under grain refinement and precipitation strengthening.

关键词： Mg-Gd-Zn alloy Hierarchical structure Microstructure evolution Mechanical properties Recrystallization kinetics

来源：评论

学校读者我要写书评

暂无评论

Transformation of long-period stacking ordered structures in Mg-Gd-Y-Zn alloys upon synergistic characterization of first-principles calculation and experiment and its effects on mechanical properties

引用

Journal of Magnesium and Alloys 2024年第5期12卷 1867-1879页

作者： Mingyu Li Guangzong Zhang Siqi Yin Changfeng Wang Ying Fu Chenyang Gu Renguo Guan School of Materials Science and Engineering Northeastern UniversityShenyang 110819China Key Laboratory of Near-Net Forming of Light Metals of Liaoning Province Dalian Jiaotong UniversityDalian 116028China Engineering Research Center of Continuous Extrusion Ministry of EducationDalian Jiaotong UniversityDalian 116028China Songshan Lake Materials Laboratory Dongguan 523808China

Based on experiments and first-principles calculations,the microstructures and mechanical properties of as-cast and solution treated Mg-10Gd-4Y-xZn-0.6Zr(x=0,1,2,wt.%)alloys are *** transformation process of long-period stacking ordered(LPSO)structure during solidification and heat treatment and its effect on the mechanical properties of experimental alloys are *** reveal that the stacking faults and 18R LPSO phases appear in the as-cast Mg-10Gd-4Y-1Zn-0.6Zr and Mg-10Gd-4Y-2Zn-0.6Zr alloys,*** solution treatment,the stacking faults and 18R LPSO phase transform into 14H LPSO *** Enthalpies of formation and reaction energy of 14H and 18R LPSO are calculated based on *** show that the alloying ability of 18R is stronger than that of *** reaction energies show that the 14H LPSO phase is more stable than the 18R *** elastic properties of the 14H and 18R LPSO phases are also evaluated by first-principles calculations,and the results are in good agreement with the experimental *** precipitation of LPSO phase improves the tensile strength,yield strength and elongation of the *** solution treatment,the Mg-10Gd-4Y-2Zn-0.6Zr alloy has the best mechanical properties,and its ultimate tensile strength and yield strength are 278.7 MPa and 196.4 MPa,*** elongation of Mg-10Gd-4Y-2Zn-0.6Zr reaches 15.1,which is higher than that of Mg-10Gd-4Y0.6Zr *** improving mechanism of elastic modulus by the LPSO phases and the influence on the alloy mechanical properties are also analyzed.

关键词： Mg-Gd-Y-Zn alloys Long-period stacking ordered First-principles calculations Enthalpies Mechanical properties

来源：评论

学校读者我要写书评

暂无评论

Effect of local loading on microstructure and enhanced mechanical property of large complex castings prepared by Al-Si-Fe-Mn-Mg-Cu alloy during squeeze casting

引用

Journal of Materials Science & Technology 2024年第33期200卷 215-226页

作者： Shuancheng Meng Minqiang Gao Yan Liu Li Yang Huan Ma Jiehua Li Jianjun Wang Renguo Guan School of Materials Science and Engineering Northeastern UniversityShenyang 110819China Key Laboratory of Near-Net Forming of Light Metals of Liaoning Province Dalian Jiaotong UniversityDalian 116028China Engineering Research Center of Continuous Extrusion Ministry of EducationDalian Jiaotong UniversityDalian 116028China Institute of Casting Research Montanuniversität LeobenLeoben A-8700Austria

Flywheel shells with a complex structure and large wall-thickness difference,as key components in heavy trucks,serve to connect the engine and *** and mechanical performance control of such components should be taken into *** this work,an Al–Si–Fe–Mn–Mg–Cu alloy was used to manufacture the flywheel shell via squeeze *** role of local loading on microstructure and mechanical property at thick-walled positions was ***,the effect of the squeeze casting specific pressure and heat treatment on the microstructure and mechanical property of the Al–Si–Fe–Mn–Mg–Cu alloy flywheel shells was also *** results showed that at the thickwalled positions,local loading not only helped eliminate the solidification defects,but also refined the microstructure includingα-Al grains and secondary dendrite arm *** increasing the squeeze casting specific pressure from 24 MPa to 32 MPa,microstructure refinement and mechanical property enhancement of squeeze casting flywheel shells were *** T6 heat treatment,the yield strength and ultimate tensile strength of flywheel shells were further increased to 261.8 and 318.4 MPa,respectively,owing to the formation of spherical eutectic Si phases and nano-sizedβ’’,Q and S precipitates.

关键词： Al-Si-Fe-Mn-Mg-Cu alloy Squeeze casting Local loading Refinement Solidification defects Strengthening mechanism

来源：评论

学校读者我要写书评

暂无评论

Microstructural evolution and strengthening mechanism of Al–Mg alloys with fine grains processed by accumulative continuous extrusion forming

引用

Journal of Materials Science & Technology 2022年第33期128卷 195-204页

作者： Bowei Yang Yu Wang Minqiang Gao Changfeng Wang Renguo Guan School of Materials Science and Engineering Northeastern UniversityShenyang 110819China Key Laboratory of Near-Net Forming of Light Metals of Liaoning Province Dalian Jiaotong UniversityDalian 116028China Engineering Research Center of Continuous Extrusion Ministry of EducationDalian Jiaotong UniversityDalian 116028China

In this work,the mechanical properties and strengthening mechanisms induced by microstructural evolution in a rheo-extruded 5087 alloy processed via accumulative continuous extrusion forming(ACEF)were *** back-scattered diffraction(EBSD)and transmission electron microscopy(TEM)were utilized to characterize the microstructure of the alloy subjected to ACEF with various *** grain refinement caused by continuous dynamic recrystallization(CDRX)was *** results demonstrated that after 3 passes of ACEF,there was a significant grain refinement effect on the alloy,and the average grain size decreased from 45.6μm to 2.5μm;the ultimate tensile strength(UTS)and yield strength(YS)of the alloy increased to 362.8 MPa and 234.6 MPa,*** cells/walls generated during deformation promoted the formation of low angle grain boundaries(LAGBs).The accumulative strain accelerated the transformation of LAGBs to high angle grain boundaries(HAGBs).Dislocation pile-up enhanced the driving force of CDRX,and nano-sized Al_6(Mn,Fe)phases at the grain boundaries inhibited the growth of grains due to the pinning *** on the quantitative estimation,dislocation strengthening and grain boundary strengthening dominated the enhancement in YS of the ACEFed alloy.

关键词： Al-Mg alloy Grain refinement Mechanical property Dynamic recrystallization Strengthening mechanism

来源：评论

学校读者我要写书评

暂无评论

Thermodynamic Analysis Modelling of in Situ Al-Ti-B Alloy Formed by Fluorine Salt Method 10

Thermodynamic Analysis Modelling of in Situ Al-Ti-B Alloy Fo...

引用

10th Annual International Conference on Material Science and Environmental Engineering, MSEE 2022

作者： Wang, Minghao Zhang, Guangzong Guo, Lili Li, Junwen Li, Gengyang Guan, Renguo Key Laboratory of Near-Net Forming of Light Metals of Liaoning Province Dalian Jiaotong University Dalian116028 China Engineering Research Center of Continuous Extrusion Ministry of Education Dalian Jiaotong University Dalian116028 China

Al-Ti-B master alloy is currently the most widely used grain refiner in aluminum alloys. Reaction controlling plays an important role in changing alloy microstructure and improving the refining effect. In this paper, Al-Ti-B master alloy is prepared by the fluoride salt method, and the control of the in-situ generated phases is realized by establishing a thermodynamic analysis modelling. Results show that the reactant change caused by the difference of alloy system directly determines the reaction sequence, which in turn affects the type and quantity of phases. The combination of elemental Ti and B is affected by the reaction system. When KBF4 is firstly consumed, TiB2 and TiAl3 are produced. And when K2TiF6 is firstly consumed, only TiB2 and AlB2 are generated in the system. Thermal balance calculation results indicate that aluminothermic reaction has a contribution to the pool temperature, which facilitates to improve the kinetic conditions of the reduction reaction. © Published under licence by IOP Publishing Ltd.

关键词： Aluminum alloys

来源：评论

学校读者我要写书评

暂无评论

Effect of Al-Ti-B Refiner on Microstructure and Properties of A356 Alloy by Continuous Rheo-Extrusion

Effect of Al-Ti-B Refiner on Microstructure and Properties o...

引用

Light Metals Symposium held at the TMS Annual Meeting and Exhibition, TMS 2023

作者： Zhang, Shuo Zhang, Guangzong Teng, Da Li, Junwen Guan, Renguo Key Laboratory of Near-Net Forming of Light Metals of Liaoning Province Dalian Jiaotong University Dalian116028 China Engineering Research Center of Continuous Extrusion Ministry of Education Dalian Jiaotong University Dalian116028 China School of Materials Science and Engineering Northeastern University Shenyang110819 China

ISBN: (纸本)9783031225314

In this paper, an Al-5Ti-1B grain refiner for continuous rheo-extrusion forming and its effect on the microstructure and properties of A356 alloy is investigated. Phase and microstructure of Al-5Ti-1B were examined by XRD, SEM, and EDS. Furthermore, the effect of Al-5Ti-1B on the microstructure and properties of the A356 alloy was studied. Results showed that the continuous rheo-extrusion can break the TiAl3 phase in Al-5Ti-1B alloy and promote the TiB2 particle to distribute uniformly. When the content of Al-5Ti-1B is 0.8 wt%, the refining effect was best. The grain size can reach 170 μm and A356 alloy obtained the optimum mechanical properties. The tensile strength, yield strength, and elongation were 290 MPa, 237 MPa, and 8.5%, respectively. © 2023, The Minerals, Metals & Materials Society.

关键词： Grain refinement

来源：评论

学校读者我要写书评

暂无评论

Effect of Al-3Ti-1B-1.5Ce Refiner on Microstructure and Mechanical Properties of A356 Aluminum Alloy

Effect of Al-3Ti-1B-1.5Ce Refiner on Microstructure and Mech...

引用

Light Metals Symposium held at the TMS Annual Meeting and Exhibition, TMS 2023

作者： Teng, Da Zhang, Guangzong Zhang, Shuo Li, Junwen Zhang, Yaodong Guan, Renguo Key Laboratory of Near-Net Forming of Light Metals of Liaoning Province Dalian Jiaotong University Dalian116028 China Engineering Research Center of Continuous Extrusion Ministry of Education Dalian Jiaotong University Dalian116028 China School of Materials Science and Engineering Northeastern University Shenyang110819 China

ISBN: (纸本)9783031225314

A356 alloy is widely used in rail transit and aerospace fields due to its excellent comprehensive properties. The refiner is called "flavor element" in aluminum industry, which plays an important role in improving the alloy microstructure and mechanical properties. In this paper, as-cast Al-3Ti-1B-1.5Ce master alloy was prepared by fluoride salt method. The optimum amount and holding time were obtained by comparing the effects of Al-3Ti-1B-1.5Ce and Al-3Ti-1B on the microstructure and properties of A356 alloy. Results showed that the average grain size in A356 alloy modified by 0.6% Al-3Ti-1B was 153.73 µm, which was much smaller than that of A356 alloy with an average grain size of 1750 µm. The introduction of Ce element caused a better refining effect of the Al-3Ti-1B-1.5Ce master alloy. When the addition of Al-3Ti-1B-1.5Ce master alloy was 0.4%, the average grain size, tensile strength and elongation reached 145.96 µm, 213.9 MPa and 11.86%, respectively. © 2023, The Minerals, Metals & Materials Society.

关键词： Titanium alloys

来源：评论

学校读者我要写书评

暂无评论

Shear bands of as-cast and semi-solid Ti_(48)Zr_(27)Cu_(6)Nb_(5)Be_(14)bulk metallic glass matrix composites

引用

China Foundry 2021年第1期18卷 75-82页

作者： Xin-hua Huang Lin-hao Zhu Hong-min Guo Hua-lan Jin Xiang-jie Yang School of Mechanical and Electrical Engineering Nanchang UniversityNanchang330031China Key Laboratory of Near Net Forming in Jiangxi Province Nanchang UniversityNanchang330031China School of Material Science and Engineering Nanchang UniversityNanchang330031China Hunan Province Special Equipment Inspection and Research Institute Changsha410117China

The as-cast Ti_(48)Zr_(27)Cu_(6)Nb_(5)Be_(14)bulk metallic glass matrix composites(BMGMCs)were fabricated using a copper mold suction casting ***,the semi-solid BMGMC samples were obtained following an isothermal treatment(heating at 900°C for 10 min,then cooling with water).The microstructure and compression property were investigated by scanning electronic microscopy(SEM)and universal mechanical *** a result of the isothermal treatment,the crystal shapes change from fine,granular,and dendritic to spherical or vermicular,and the average crystal size of the as-cast and semi-solid samples is 2.2μm and 18.1μm,*** plasticity increases from 5.31%in the as-cast to 10.23%in the semi-solid samples,with an increase of 92.66%.The shear bands from different areas of the side surfaces of as-cast and semisolid compression fracture samples were *** characteristic changes of multiplicity,bend,branch and intersection of shear bands in different areas indicate that the deformation of as-cast and semi-solid samples is non-uniform during *** is found that poor plasticity of the as-cast samples or good plasticity of the semi-solid samples are reflected by characteristics of the shear *** semi-solid isothermal treatment improves the plasticity by forming large crystals which can block the expansion of shear bands and promote the multiplicity of shear bands.

关键词： shear bands Ti_(48)Zr_(27)Cu_(6)Nb_(5)Be_(14) as-cast semi-solid plasticity

来源：评论

学校读者我要写书评

暂无评论

Balancing strength and electrical conductivity in recycled Al-Mg-Si alloys: Beneficial effect of combining continuous rheo-extrusion processing with Al-5Ti-1B refiner

引用

Materials and Design 2025年 255卷

作者： Zhang, Shuo He, Qing Zhang, Guangzong Yin, Siqi Li, Junwen Zhang, Jin Guan, Renguo Engineering Research Center of Continuous Extrusion Ministry of Education Dalian Jiaotong University Dalian116028 China Key Laboratory of Near-Net Forming of Light Metals of Liaoning Province Dalian Jiaotong University Dalian116028 China School of Mechanical Engineering Dalian Jiaotong University Dalian116028 China

This study utilizes the continuous rheo-extrusion (CRE) process and CRE Al-5Ti-1B grain refiner to fabricate high-quality recycled Al-Mg-Si alloy wires, aiming to achieve an optimal balance between strength and electrical conductivity. The research shows that a proper extrusion roll speed (≤ 6 rpm) promotes the formation and transformation of low-angle grain boundaries (LAGBs) into high-angle grain boundaries (HAGBs), while increased shear stress induces the fragmentation of secondary phases and the formation of nano-sized secondary phases. This promotes continuous dynamic recrystallization (CDRX) and grain refinement. However, excessive speeds elevate deformation temperatures, impeding refinement and promoting grain growth. The CRE Al-5Ti-1B addition aids in CDRX and counters the adverse effects of higher temperatures. Grain refinement and increased dislocation density primarily elevate the yield strength (YS), while the increase in volume fraction of nano-sized precipitates chiefly boosts electrical conductivity. At 6 rpm with 0.4 wt.% CRE Al-5Ti-1B, the alloy wire exhibited average grain size of 8.7 μm, YS of 108.6 MPa, ultimate tensile strength (UTS) of 243.5 MPa and an electrical conductivity of 54.8 % IACS. This approach enables the production of Al-Mg-Si alloy wires with enhanced strength and conductivity, offering insights into the recycling and sustainable utilization of these materials. © 2025

关键词： Dynamic recrystallization

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：