Gd对AZ91D-0.4%Ca-0.3%Sr镁合金低周疲劳性能的影响  

Effect of Gd on Low Cycle Fatigue Properties of AZ91D-0.4Ca-0.3Sr

作　　者：朱永长[1] 宋春梅[1] 李海涛[1] 荣守范[1] 王红英[1] 

机构地区：[1]佳木斯大学材料科学与工程学院,黑龙江佳木斯154007

出　　处：《佳木斯大学学报（自然科学版）》2011年第4期610-612,共3页Journal of Jiamusi University：Natural Science Edition

基　　金：黑龙江省科技厅中俄合作项目支持(WB07B04)

摘　　要：通过运用控制总应变幅的方法,在应力比R=-1条件下施加拉-压载荷,测试了合金元素Gd复合添加对金属型铸造镁合金AZ91D-0.4%Ca-0.3%Sr的低周疲劳性能的影响,并利用光学电子显微镜、扫描电镜分别观察了材料在不同状态下的显微组织及低周疲劳断口特征.结果表明:Gd的添加能细化铸态AZ91D镁合金的晶粒,加入3.0%Gd可以提高镁合金的低周疲劳性能.The properties of gravity casting AZ91D-0.4Ca-0.3Sr alloy with Gd in metal mould were studied by controlling the total strain amplitude under the conditions of the stress of ratio R equal to-1.In addition,the microstructure,phases,chemical constitute,fracture and low cycle fatigue behaviors of the magnesium alloy were primarily researched by means of SEM,EDAX,XRD and so on.The results showed that 3.0wt%Gd and 3.0wt%Y introduced into the AZ91D-0.4Ca-0.3Sr alloy can refine α-Mg,and that Gd can significantly improve the low cycle fatigue life.

关 键 词：AZ91D-0.4Ca-0.3Sr GD 低周疲劳 

分 类 号：TG146.22[一般工业技术—材料科学与工程]