文献类型：期刊文献

中文题名：半固态注射成型SiC_(p)/AZ37镁合金复合材料的低周疲劳性能

英文题名：Low Cycle Fatigue Properties of Semi-solid Injection Molded SiC_(p)/AZ37 Magnesium Alloy Composites

作者：周丽萍[1];谷立东[1];曾小勤[1];莫旭阳[2];朱明亮[2]

机构：[1]上海交通大学材料科学与工程学院,上海镁材料及应用工程技术研究中心,上海200240;[2]华东理工大学机械与动力工程学院,上海200237

年份：2025

卷号：49

期号：1

起止页码：16

中文期刊名：机械工程材料

外文期刊名：Materials For Mechanical Engineering

收录：;北大核心:【北大核心2023】；

基金：国家自然科学基金资助项目(52305158);上海交通大学决策咨询课题实验技术专项项目(JCZXSJB2024-21)。

语种：中文

中文关键词：半固态注射成型;镁基复合材料;SiC颗粒;AZ37镁合金;低周疲劳

外文关键词：semi-solid injection molding;magnesium matrix composite;SiC particle;AZ37 magnesium alloy;low cycle fatigue

摘要：采用半固态注射成型工艺制备不同质量分数(0,5%,12%)SiC_(p)/AZ37镁合金复合材料,研究了SiC_(p)添加量对显微组织、拉伸性能和低周疲劳性能的影响。结果表明:不同SiC_(p)添加量下复合材料均由初生α-Mg、β-Mg17Al12析出相和SiC_(p)组成,相比AZ37镁合金,晶粒尺寸显著细化,析出相数量减少,屈服强度和弹性模量增大,抗拉强度和断后伸长率减小,随着SiC_(p)添加量增加,拉伸断裂模式由韧性断裂向韧脆混合断裂、脆性断裂转变;随着SiC_(p)添加量增加,循环滞回环变窄,低周疲劳寿命先延长后缩短,循环响应为初始循环软化后循环硬化直至失效,循环硬化程度增大。
SiC_(p)/AZ37 magnesium alloy composites with different mass fractions(0,5%,12%)of SiC_(p)were prepared by semi-solid injection molding.The effects of SiC_(p)addition amount on the microstructure,tensile properties and low cycle fatigue properties were studied.The results show that the composites with different SiC_(p)addition amounts were composed of primaryα-Mg,β-Mg17Al12 precipitates and SiC_(p).Comparing with AZ37 magnesium alloy,the grain size of the composite was significantly refined,the number of precipitates decreased,the yield strength and elastic modulus increased,and the percentage elongation after fracture decreased.With the increase of the SiC_(p)addition amount,the tensile fracture mode changed from ductile fracture to ductile and brittle mixed fracture and brittle fracture.With the increase of SiC_(p)addition,the cyclic hysteresis ring became narrow,and the low cycle fatigue life was first extended and then shortened.The cyclic response was initial cyclic softening and then cyclic hardening until failure,and the cyclic hardening degree increased.