摘要
针对典型航空用钛合金和铝合金,通过准静态拉伸和压缩试验研究不同加载速率下TC4钛合金和7075铝合金的力学性能,并分析了材料拉伸微观断口形貌。研究表明:相同加载速率下钛合金的抗拉强度比铝合金高约300 MPa、抗压强度高约800 MPa;拉伸速率对钛合金和铝合金的弹性模量和断面收缩率均有较为显著的影响。压缩速率对两种合金的力学性能影响均不显著。但同种材料的拉、压弹性模量相差较大;拉伸断裂后钛合金颈缩较为明显,铝合金放射区较为明显,表明钛合金塑性较好,铝合金硬度较大。压缩破坏后钛合金与铝合金断面角度约为45°~55°;拉伸条件下钛合金断口微观组织形貌中出现大量大小不一的韧窝,断口伴有少量的撕裂棱。铝合金断口出现了较大的韧窝,部分韧窝内还包含空洞。
Aiming at typical aerospace titanium alloy and aluminum alloy,the mechanical properties of TC4 titanium alloy and 7075 aluminum alloy at different loading rates were studied by quasi-static tensile and compression tests,and the tensile fracture morphology of the alloy materials was analyzed.The results show that at the same loading rate,the tensile and compressive strengths of the titanium alloy are higher than those of the aluminum alloy by about 300 and 800 MPa,respectively.The tensile rate has significant effects on the elastic modulus and scross-section shrinkage of both titanium alloy and aluminum alloy.The compression rate has little significant effect on the mechanical properties of the two alloys.However,the tensile and compressive elastic modulus of the same material differ greatly.After the tensile fracture,the necking of the titanium alloy is obvious,and the radiation area of the aluminum alloy is obvious,which indicates that the titanium alloy has better plasticity and the aluminum alloy has higher hardness.After compression destruction,the fracture angle of the titanium alloy and the aluminum alloy is about 45°-55°.Under the tensile loading condition,the fracture of the titanium alloy demonstrates a large population of differently sized dimples,accompanied by a small number of tearing edges.The fracture of the aluminum alloy shows large-sized dimples,some of which contain voids.
作者
喻秋
李顺才
邵明辉
吴春力
YU Qiu;LI Shun-cai;SHAO Ming-hui;WU Chun-li(School of Mechanical and Electrical Engineering,Jiangsu Normal University,Xuzhou 221116,China;JSNU-SPBPU Institute of Engineering,Jiangsu Normal University,Xuzhou 221116,China)
出处
《塑性工程学报》
CAS
CSCD
北大核心
2019年第6期157-167,共11页
Journal of Plasticity Engineering
基金
国家自然科学基金资助项目(51574228)
江苏省研究生科研与实践创新计划项目(KYCX18-2150)
江苏省大学生实践创新训练计划项目(201810320024z)
徐州市科技计划项目(KH17002)
关键词
航空用合金
准静态拉伸和压缩
力学性能
断口形貌
aerospace alloy
quasi-static tensile and compression
mechanical properties
fracture morphology
