AZ31镁合金板材的微观组织演变及腐蚀行为（英文）  

Microstructure Evolution and Corrosion Performance of AZ31 Magnesium Alloy Sheets

作　　者：杨青山[1,2] 蒋斌[1,2] 向庆[2] 罗素琴 郁笑雯 潘复生[1,2] 

机构地区：[1]重庆市科学技术研究院,重庆401123 [2]重庆大学国家镁合金工程中心,重庆400044

出　　处：《稀有金属材料与工程》2016年第7期1674-1677,共4页Rare Metal Materials and Engineering

基　　金：Chongqing Science and Technology Commission(CSTC2012JJJQ50001,cstc2012gg B50003,CSTC2013jcyj C60001);National Natural Science Foundation of China(51171212,51474043)

摘　　要：在室温下对AZ31镁合金板材分别沿与挤压方向成0°,30°,45°,60°和90°5个方向进行了预拉伸变形,之后研究了其微观结构和预变形后板材的腐蚀性能。结果表明,随着角度的增加,孪晶数量也随之增加,孪晶量多的镁合金板材（-52%）具有较好的抗腐蚀性。这主要是因为拉伸孪晶引入的更多晶界,使合金的微观结构更为均匀,从而可以抑制腐蚀行为产生。AZ31 Mg alloy sheets were pre-stretched（PRS） at the angles of 0°,30°,45°,60° and 90° between the tensile direction and the extrusion direction at room temperature.Twinning was thus introduced and gradually increased.The microstructure evolutions and corrosion behavior were examined and compared.Results show that the corrosion performance of the twinned Mg alloy sheets is sensitive to the area fraction of twins.Meanwhile,the sheet possessing most area fraction of twins（-52%） exhibits the best corrosion resistance.This is attributed to the subdivision of grains by introducing extension twin boundaries.Twinning brings about more grain boundaries that act as a corrosion barrier and thus improve the corrosion resistance.

关 键 词：镁合金 微观组织 孪生 腐蚀行为 

分 类 号：TG146.22[一般工业技术—材料科学与工程]