| 铸锻复合成形后AZ91镁合金的组织和力学性能 |
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| 引用本文： | 曹韩学,郝婷婷,赵东林.铸锻复合成形后AZ91镁合金的组织和力学性能[J].机械工程材料,2012(8):42-45. |
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| 作者姓名： | 曹韩学 郝婷婷 赵东林 |
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| 作者单位： | 重庆大学材料科学与工程学院;国家镁合金材料工程技术研究中心 |
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| 基金项目： | 重庆市科技攻关项目(CSTC 2008AB4111;CSTC2010AA4045) |
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| 摘 要： | 通过铸锻(压铸和模锻)复合成形方式制备了AZ91镁合金汽车转向控制臂,对控制臂主要受力部位的显微组织和力学性能进行了研究,并对拉伸断口进行了分析。结果表明:铸锻复合成形后,AZ91镁合金转向控制臂不同区域的变形量不同,变形量大的区域呈明显的流线特征,并发生动态再结晶,为细小的等轴晶;与压铸态相比,铸锻复合成形后合金的抗拉强度、屈服强度、伸长率及硬度分别为251.3MPa、156.9MPa、4.12%和125HV;断裂机制由脆性断裂变为韧脆混合断裂。
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| 关 键 词： | AZ91镁合金 铸锻复合成形 显微组织 力学性能 断裂机制 |
Microstructure and Mechanical Properties of AZ91 Magnesium Alloy after Casting-Forging Combined Forming |
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| CAO Han-xue,HAO Ting-ting,ZHAO Dong-lin.Microstructure and Mechanical Properties of AZ91 Magnesium Alloy after Casting-Forging Combined Forming[J].Materials For Mechanical Engineering,2012(8):42-45. |
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| Authors: | CAO Han-xue HAO Ting-ting ZHAO Dong-lin |
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| Affiliation: | 1(1.School of Materials Science and Engineering,Chongqing University,Chongqing 400044,China; 2.National Engineering Research Center for Magnesium Alloy Materials,Chongqing 400044,China) |
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| Abstract: | A AZ91 magnesium alloy vehicle steering control arm was used to prepare by casting-forging combined forming,the microstructure and mechanical properties of the control arm′s main force parts were studied and the tensile fracture was analyzed.The results show that the deformations were different in different zones of AZ91 magnesium alloy vehicle steering control arm after casting-forging forming,the obvious streamlined characteristics and dynamic recrystallization were found in large deformation zone,and the grains were fine equiaxed crystal.Compared with the die-casting,the tensile strength,yield strength,elongation and hardness of the alloy after casting-forging combined forming were 251.3 MPa,156.9 MPa,4.12% and 125 HV,respectively.The fracture mechanism changed from brittle fracture into ductile-brittle fracture. |
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| Keywords: | AZ91 magnesium alloy casting-forging combined forming microstructure mechanical property fracture mechanism |
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