李海,郑凯,王芝秀,郑子樵.冷轧压下量对时效6156铝合金组织与性能的影响[J].稀有金属材料与工程,2019,48(9):2957~2964.[Li Hai,Zheng Kai,Wang Zhixiu,Zheng Ziqiao.The Effect of Cold-rolling Thickness Reduction on Mechanical Properties and Microstructures of 6156 Al alloy[J].Rare Metal Materials and Engineering,2019,48(9):2957~2964.]
冷轧压下量对时效6156铝合金组织与性能的影响
投稿时间:2018-04-26??修订日期:2018-07-18
中文关键词:??铝合金??形变热处理??微观组织??力学性能??断裂
基金项目:国家自然科学基金资助(项目号51571038、51671038),江苏省自然科学基金资助(项目号BK20151188、BK20171195)
中文摘要:
??????采用拉伸试验、金相观察、X射线衍射、扫描电镜及透射电镜等,研究了180 ℃/1 h欠时效+50~80%压下量冷轧+100 ℃/48 h再时效的6156铝合金组织和力学性能。拉伸测试表明,合金抗拉强度、屈服强度和断裂延伸率分别为515~564 MPa、472~551 MPa和5.7~11.1%,获得高强度和良好塑性。微观分析表明,合金强度源于形变强化和析出强化共同作用,并随压下量增加而增大;合金塑性改善源于位错密度下降和析出强化增强;拉伸断口上沿晶与穿晶断裂并存,增大压下量,韧窝变浅、数量增加。
The Effect of Cold-rolling Thickness Reduction on Mechanical Properties and Microstructures of 6156 Al alloy
英文关键词:Aluminum alloys??thermomechanical treatment??microstructures??mechanical properties??fractute
英文摘要:
??????The mechanical properties and microsctructures of the 6156 Al alloy subjected to a thermomechanical treatment consisting of under-ageing at 180 ℃ for 1 h, cold-rolling at room temperature with the thickness reductions of 50~80% and re-ageing at 100 ℃ for 48 h were investigated by optical microscopy, tensile test, X-ray diffraction, scanning electron microscopy and transmission electron microscopy. The tensile test indicates that the alloy can achieve high strength and relatively good ductility simultaneously and the ultimate strength, yield strength and elongation to failure are 515~564 MPa, 472~551 MPa and 5.7~11.1%, respectively. The microsctrucural observations show that the high strength results from the combination of deformation and precipitation strengthening and increases with increasing the thickness reductions. The improved ductility is attributed to both the decreased dislocation density and increased precipitation strengthening. The fractographies of the alloy consist of intergranular and dimple-induced transgranular fracture and the dimples have shallow depths and increased number with increasing the thickness reductions.
作者单位E-mail
李海?常州大学 材料科学与工程学院?lehigh_73@163.com?
郑凯?常州大学 材料科学与工程学院??
王芝秀?常州大学 材料科学与工程学院?xiu_wzx@163.com?
郑子樵?中南大学??
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