铸造技术2017，Vol.38Issue(7)：1674-1677,4.DOI:10.16410/j.issn1000-8365.2017.07.039
冷却速度对离心铸造AZ91镁合金组织和性能的影响
Effect of Cooling Rate on Microstructure and Properties of AZ91 Magnesium Alloy Prepared by Centrifugal Casting
邵煜波 1马幼平 1杨蕾 1邹龙龙 1赵磊 1李伟1
作者信息
- 1. 西安建筑科技大学冶金工程学院,陕西西安710055
- 折叠
摘要
Abstract
Solidification microstructure evolution and mechanical properties of AZ91 magnesium alloy under different cooling rate were explored.The results show that the grain size of the centrifugal casting AZ91 magnesium alloy refines under heat preservation cooling condition,and only a small amount of β phase (Mg12Al17) precipitates.It tends to directional solidification.The second phase distribution is uniformity,and it consists of the first β3 phase and a small amount of the second phase in the intracrystalline.Under no heat preservation cooling condition,the degree of grain refinement is bigger,the β phase precipitation quantity increases obviously,and it tends to volume solidification,is mainly composed of secondary β phase.With the increase of cooling rate,the first β phase changes from two separate short clavite complete-divorced eutectic structure to bulky continuous "honeycomb" shape part-divorced eutectic structure.In the same centrifugal pressure,with the improvement of cooling rate,the compressive strength increases,the largest plastic drops.关键词
冷却速度/离心铸造/AZ91镁合金/显微组织/力学性能Key words
cooling rate/centrifugal casting/AZ91 magnesium alloy/microstructure/mechanical properties分类
金属材料引用本文复制引用
邵煜波,马幼平,杨蕾,邹龙龙,赵磊,李伟..冷却速度对离心铸造AZ91镁合金组织和性能的影响[J].铸造技术,2017,38(7):1674-1677,4.
