浇注温度对近液相线挤压铸造AZ91D镁合金组织及性能的影响
Effects of Pouring Temperature on Microstructure and Mechanical Property of Near-liquidus Squeeze Casting AZ91D Alloy
赵春芳 1马光全 2颜泽华 3胡茂良 4吉泽升1
作者信息
- 1. 丽水职业技术学院机械工程学院,丽水 323000;哈尔滨理工大学材料科学与化学工程学院,哈尔滨 150080
- 2. 丽水职业技术学院机械工程学院,丽水 323000
- 3. 哈尔滨理工大学荣成学院,荣城 264300
- 4. 哈尔滨理工大学材料科学与化学工程学院,哈尔滨 150080
- 折叠
摘要
以汽车差速器支架为对象,研究了不同浇注温度下近液相线挤压铸造AZ91D镁合金的组织及力学性能.结果表明,浇注温度由595℃ 升至665℃ 时,合金内部球状晶逐渐长大成蔷薇状晶,平均晶粒尺寸由 21.02 μm增大到58.13 μm.第二相β-Mg17Al12的含量从18.55%提高到49.72%,且分布均匀性逐渐降低.浇注温度较低(595℃ 和605℃ )时,合金拉伸断口存在大量韧窝和小面积的解理平面;随着浇注温度提高,断口的韧窝数量、解理台阶逐渐减少.浇注温度为 605℃ 时,合金的抗拉强度为 229.2 MPa,伸长率为3.16%,均达到了最大值.
Abstract
Taking the automobile differential supportor as object,the microstructure and mechanical properties of AZ91D alloy were investigated under different near-liquidus squeeze casting temperatures.The results indicate that when the pouring temperature is increased from 595℃ to 665℃ ,the spherical crystal in the alloy is gradually trans-formed into a rosette-like crystal,and the average grain size is increased from 21.02 μm to 58.13 μm.The content of the second phase β-Mg17Al12 is increased from 18.55%to 49.72%,and its uniformity is gradually weakened.When the pouring temperature is low(595℃ and 605℃ ),there exist a lot of dimples and a small area of cleavage plane in the tensile fracture.The number of dimples and cleavage steps of the fracture is gradually decreased at a higher pouring temperature.At the pouring temperature of 605℃ ,the tensile strength and elongation reach up to 229.2 MPa and 3.16%,respectively.
关键词
浇注温度/近液相线挤压铸造/AZ91D镁合金/微观组织Key words
Pouring Temperature/Near-liquidus Squeeze Casting/AZ91D Mg Alloy/Microstructure引用本文复制引用
基金项目
国家自然科学基金资助项目(51574100)
出版年
2024
NETL
NSTL
维普
万方数据