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Ca和Sm复合微合金化对AZ31合金组织和力学性能的影响
Effect of Ca and Sm Combined Microalloying on Microstructure and Mechanical Properties of AZ31 Alloy
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- DOI:
- 作者:
- 郭春榕 付丽 乐启炽 贾征 路林
GUO Chunrong;FU Li;LE Qichi;JLA Zheng;LU Lin
- 作者单位:
- 沈阳大学机械工程学院 东北大学材料电磁过程研究教育部重点实验室
College of Mechanical Engineering,Shenyang University,Shenyang 110044,China;Key Lab of Electromagnetic Processing of Materials,Ministry of Education,Northeastern University,Shenyang 110819,China
- 关键词:
- 镁合金 SM CA 显微组织 力学性能
magnesium alloy Sm Ca microstructure mechanical properties
- 摘要:
- 以AZ31合金为基础,通过加入碱土元素Ca(0.3%)和轻稀土元素Sm(0.3%),分析了铸态和挤压态合金的显微组织,并测试了其室温和高温拉伸力学性能。利用光学显微镜(OM)和扫描电镜(SEM)观察合金组织;采用X射线衍射仪(XRD)进行相组成分析。结果表明,AZ31-0.3Ca-0.3Sm合金铸态组织主要由α-Mg基体、不连续网状β-Mg17Al12相、新相Al11Sm3及少量Al2Ca相组成;挤压态晶粒尺寸明显细化且分布不均,动态再结晶的平均晶粒尺寸为9.5μm;挤压后的室温屈服强度Rp0.2为180 MPa,极限抗拉强度Rm为261 MPa,伸长率A为18.0%,150℃时的屈服强度Rp0.2为125 MPa,极限抗拉强度Rm为148 MPa,伸长率A为52.2%。
Based on AZ31 alloy,the microstructure of as-cast and extruded alloy was analyzed by adding Ca(0.3%)and Sm(0.3%),and the tensile mechanical properties of AZ31 alloy were tested at room temperature and high temperature.The microstructure of the alloy was observed by optical microscope(OM)and scanning electron microscope(SEM).The phase composition was analyzed by X-ray diffractometer(XRD).The results show that the microstructure of as-cast AZ31-0.3Ca-0.3 Sm alloy is mainly composed of-Mg matrix,discontinuousβ-Mg17Al12 phase,new phase Al11Sm3 and a small amount of Al2Ca phase.In the extruded state,the grain size is refined and unevenly distributed,and the average grain size of dynamic recrystallization is 9.5μm.After extrusion,the yield strength Rp0.2 at room temperature is 180 MPa,the ultimate tensile strength Rm is 261 MPa,and the elongation A is 18.0%.At 150℃,the yield strength Rp0.2 is 125 MPa,the ultimate tensile strength Rm is 148 MPa,and the elongation A is 52.2%.