Microstructure and mechanical properties of as-cast and extruded biomedical Mg-Zn-Y-Zr-Ca alloy at different temperatures  

铸态和挤压态生物医用Mg-Zn-Y-Zr-Ca合金在不同温度下的显微组织与力学性能（英文）

作　　者：Qing-gong JIA Wen-xin ZHANG Yi SUN Chun-xiang XU Jin-shan ZHANG Jun KUAN 贾庆功;张文鑫;孙毅;许春香;张金山;宽军(太原理工大学科学与工程学院,太原030024;山西省高级镁基材料重点实验室,太原030024)

机构地区：[1]College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China [2]Shanxi Key Laboratory of Advanced Magnesium-based Materials, Taiyuan 030024, China

出　　处：《Transactions of Nonferrous Metals Society of China》2019年第3期515-525,共11页中国有色金属学报（英文版）

基　　金：Projects(51574175,51474153) supported by the National Natural Science Foundation of China

摘　　要：A type of biomedical magnesium alloy Mg-3Zn-1Y-0.6Zr-0.5Ca was cast and extruded at three extrusion temperatures of 270, 300 and 330 °C. The microstructure and mechanical properties of the cast and extruded alloys, tailored at different extrusion parameters, were investigated using tensile tests, optical microscopy, scanning electron microscopy, energy dispersive spectroscopy, X-ray diffractometry, transmission electron microscopy and electron backscattered diffraction. Optimum comprehensive mechanical properties are achieved in the alloy extruded at 270 °C, the ultimate tensile strength and the elongation reach 315 MPa and 26%, respectively, which is deemed to be associated with the grain refinement, weak basal texture and second phases strengthening. After hot extrusion, extensive dynamic recrystallization is found in the Mg-3Zn-1Y-0.6Zr-0.5Ca alloy. Continuous Mg3YZn6 phase bands are gradually broken into discontinuous chain-like or dot-like structures, and the grains distribute more uniformly. The as-extruded Mg-3Zn-1Y-0.6Zr-0.5Ca alloy exhibits a weak texture with (0001) basal planes parallel to the extrusion direction.对一种新型生物医用镁合金Mg-3Zn-1Y-0.6Zr-0.5Ca分别在270,300和330°C下进行铸造和挤出实验。通过拉伸试验、光学显微镜、扫描电子显微镜、能量色散光谱、X射线衍射技术、透射电子显微镜和电子背散射衍射研究铸态和不同挤出参数下挤压态合金的显微组织和力学性能。结果表明,270°C挤压态合金具有最佳的综合力学性能,其极限拉伸强度和伸长率分别达到315MPa和26%,这与晶粒细化、较弱的基底织构和第二相强化有关。经热挤压后,Mg-3Zn-1Y-0.6Zr-0.5Ca合金出现大量动态再结晶。连续的Mg_3YZn_6相带逐渐分裂成不连续的链状或点状结构,且晶粒分布更均匀。挤压态Mg-3Zn-1Y-0.6Zr-0.5Ca合金呈(0001)基面平行于挤出方向的弱织构特征。

关 键 词：magnesium alloy QUASICRYSTAL hot extrusion dynamic recrystallization mechanical properties 

分 类 号：TG146.22[一般工业技术—材料科学与工程]