连铸连轧AZ31+Y+Sr超塑性镁合金力学性能研究.doc

文档介绍：
连铸连轧 AZ31+Y+Sr 超塑性
镁合金力学性能研究#
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(1. 哈尔滨理工大学材料科学与工程学院;
2. 黑龙江工程学院机电工程学院)
摘要:针对添加了 Y 和 Sr 元素的双辊连铸连轧(TRC)AZ31 镁合金板材的超塑性能进行了研究,采用了双辊
连铸连轧工艺制备出实验所需的 1mm 厚板材,并获得更加细小的等轴晶粒组织。AZ31 镁合金中添加的 Y 和
Sr 两种元素在基体内形成第二相,能有效的阻止晶粒长大。对板材进行了拉伸实验,通过光学显微镜和 SEM
对试样进行分析,通过对比,在温度为 400℃和应变速率 7×10-4s-1 条件下,添加了 Y 和 Sr 元素的 AZ31
板材其超塑性能比普通双辊连铸连轧 AZ31 板材有显著提高。
关键词: AZ31+Y+Sr 镁合金,双辊连铸连轧,超塑性,气胀成形
中图分类号:
Mechanical Properties of AZ31+Y+Sr Magnesium Alloys
Produced by Twin-roll Casting and Sequential Hot Rolling
YU Yandong1, NING Huiyan1,2, JIANG Peng1, LIN Kai1
(1. School of Materials Science and Engineering,Harbin Unversity of Science and ology,
Harbin 150040;
2. School of Mechanical and Electrical Engineering,Heilongjiang Institute of Technology, Harbin
150050)
Abstract: Mechanical forming properties of the AZ31+Y+Sr magnesium alloy sheets produced by
twin-roll casting (TRC) and sequential hot rolling were studied. The 1mm sheets of AZ31+Y+Sr
magnesium alloys in the experiment were made by twin roll casting process, which exhibit finer
equiaxed grain structure. The addition of Y and Sr elements to the AZ31 magnesium alloy lead to
the formation of the second phase in the matrix, prevent grain growth effectively. At the same
time,we carried out Uniaxial tensile tests on AZ31+Y+Sr magnesium alloy concluded
through the optical mi