摘要
对具有不同显微特征与缺陷的重力铸造AZ910的力学性能进行了研究。研究表明规模较大的缩松群对AZ910的性能危害最大，残留第二相次之；当合金中没有中等及以上规模缩松或残留第二相时，合金的性能取决于晶粒度大小。常规铸造AZ91DT6态力学性能根据其组织的显微特征与缺陷的不同可以分为三个层次：（1）合金中含有较大规模的缩松或有大量残留第二相时，其抗拉强度〈230MPa；（2）合金中有小规模缩松或少量残留第二相时，其抗拉强度在230—250MPa之间；（3）合金中没有缩松和残留第二相时，其抗拉强度由晶粒度决定，当合金晶粒大小小于200μm时，抗拉强度〉270MPa。
Mechanical properties were tested for the alloy with different microstructural features and defects. The results indicated that heavy shrinkage porosity is the most detrimental to the mechanical properties of gravity cast AZ91D magnesium alloy, left second phase secondly. The mechanical properties were determined by grain size, when there was no serious shrinkage and left second phases. The mechanical properties of AZ91D with T6 state could be divided into three level according to different microstructural features and defects. （1） Large shrinkage porosity or left second phase, UTS〈230 MPa; （2） Little shrinkage porosity or left second phase, 230 MPa〈UTS〈250 MPa; （3） No shrinkage porosity or left second phase, grain size decides the mechanical property, when grain size smaller than 200μm, UTS〉270 MPa.
出处
《铸造工程》
2007年第2期20-24,共5页
Foundry Engineering
关键词
显微特征
缺陷
力学性能
AZ91D
镁合金
Microstructural feature
Defect
Mechanical property
AZ91D
Magnesium alloy
