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

作　　者：刘章兴 文科 李永坤[1,2] 熊文韬 王志杰 周荣锋 LIU Zhang-xing;WEN Ke;LI Yong-kun;XIONG Wen-tao;WANG Zhi-jie;ZHOU Rong-feng(Faculty of Materials Science and Engineering,Kunming University of Science and Technology,Kunming 650032,China;City College,Kunming University of Science and Technology,Kunming 650051,China)

机构地区：[1]昆明理工大学材料科学与工程学院,云南昆明650032 [2]昆明理工大学城市学院,云南昆明650051

出　　处：《塑性工程学报》2024年第8期171-178,共8页Journal of Plasticity Engineering

基　　金：国家自然科学基金资助项目(5176050239)。

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。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 andα-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 ofα-phase high Sn transition layer of the semi-solid CuSn10P1 alloy,indicating 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 

分 类 号：TG146.1[一般工业技术—材料科学与工程]