CuSn10P1合金晶间偏析对拉伸断裂行为的影响及变形机制
Effect of intergranular segregation on tensile fracture behavior and deformation mechanism of CuSn10P1 alloy
刘章兴 1文科 1李永坤 2熊文韬 1王志杰 1周荣锋2
作者信息
- 1. 昆明理工大学 材料科学与工程学院,云南 昆明 650032
- 2. 昆明理工大学 材料科学与工程学院,云南 昆明 650032;昆明理工大学 城市学院,云南 昆明 650051
- 折叠
摘要
在室温和拉伸速度 1 mm·min-1 的条件下,对两种不同晶间偏析程度的CuSn10P1 合金进行了单向拉伸试验.结果表明,半固态合金抗拉强度和断后伸长率相比液态合金分别提高 30.7%和 378.7%.在拉伸过程中,两种材料的裂纹都是沿晶间和α相高锡过渡层扩展,但是半固态CuSn10P1 合金具有更优异的力学性能.这主要归因于半固态CuSn10P1 合金具有较少的晶间组织、更细小的晶粒尺寸和更高的Sn元素固溶度.断裂后,在半固态CuSn10P1 合金的α相高锡过渡层区域发现了变形孪晶,说明其变形机制由滑移机制向孪生机制转变.
Abstract
Unidirectional tensile tests were carried out on CuSn10P1 alloys with two different intergranular segregation degrees at room temperature and stretching velocity of 1 mm·min-1.The results show that the tensile strength and elongation after fracture of semi-solid alloy are increased by 30.7%and 378.7%than those of liquid alloy,respectively.Cracks in both materials extend along the intergranular and α-phase high Sn transition layer during tension process,but the semi-solid CuSn10P1 alloy has superior mechanical properties.This is mainly attributed to that the semi-solid CuSn10P1 alloy has less intergranular structure,finer grain size and higher solid solubility of Sn element.After fracture,deformed twins are found in the region of α-phase high Sn transition layer of the semi-solid CuSn10P1 alloy,indi-cating a shift in the deformation mechanism from slip mechanism to twinning mechanism.
关键词
CuSn10P1合金/晶间偏析/断裂行为/变形机制Key words
CuSn10P1 alloy/intergranular segregation/fracture behavior/deformation mechanism引用本文复制引用
基金项目
国家自然科学基金资助项目(5176050239)
出版年
2024
NETL
NSTL
万方数据