摘要
对铸造态Cu-17Ni-2.5Sn-1.5Al合金依次进行930℃×2.5h均匀化退火处理和950℃热挤压,研究了热挤压态合金的显微组织和拉伸性能,分析了其强化机制。结果表明:热挤压态合金的组织发生明显细化,平均晶粒尺寸约为32μm,基体组织中存在弥散分布的球形Ni3Al相,其直径约为10nm;热挤压态合金的抗拉强度达922MPa,屈服强度为779 MPa;合金中存在细晶强化、固溶强化以及第二相析出强化等3种强化机制,且以固溶强化为主,固溶强化占总强化效果的56%;铝元素主要起固溶强化和第二相析出强化作用。
Homogenization annealing treatment at 930℃for 2.5 hand hot extrusion at 950℃were conducted on as-cast Cu-17 Ni-2.5 Sn-1.5 Al alloy in sequence.The microstructure and tensile properties of the hotextruded alloy were studied,and the strengthening mechanism was analyzed.The results show that the microstructure of the hot-extruded alloy was refined obviously to average grain size of about 32μm.Spherical Ni3 Al phase with a diameter of about 10 nm dispersed in the matrix structure.The ultimate tensile strength of the hotextruded alloy was 922 MPa and the yield strength was 779 MPa.The alloy had three types of strengthening mechanism,namely refinement crystal strengthening,solid solution strengthening and second phase precipitation strengthening.The solid solution strengthening played a main role and accounted for 56%of the total strengthening effect.Aluminum played a solid solution strengthening role and a second phase precipitation strengthening role.
作者
罗保民
李道喜
赵超
罗宗强
王智
杨超
张卫文
LUO Baomin;LI Daoxi;ZHAO Chao;LUO Zongqiang;WANG Zhi;YANG Chao;ZHANG Weiwen(Guangdong Key Laboratory for Processing and Forming of Advanced Metallic Materials,South China University of Technology,,Guangzhou 510640,China;School of Mechanical and Automotive Engineering,South China University of Technology,,Guangzhou 510640,China)
出处
《机械工程材料》
CAS
CSCD
北大核心
2019年第4期1-5,24,共6页
Materials For Mechanical Engineering
基金
广东省自然科学基金团队项目(2015A030312003)
广东省应用型科技研发专项资金资助项目(2016B090931002)
