摘要
研究了预时效处理对Al-Zn-Mg-Cu铝合金薄板力学性能和微观组织的影响,测试了显微硬度和力学性能,表征了TEM微观精细组织。结果表明:固溶处理后在180℃立即进行人工时效处理,可获得Al-Zn-Mg-Cu合金的显著时效硬化效果,且在8 h后达到峰值硬度195 HV0.5,与基体呈共格关系的η'相为主要强化相;120℃×10 min为最佳的预时效处理制度,经14天的室温停滞后,相比于固溶+自然时效态,硬度降低了13 HV0.5,降幅达到10.7%,具有明显的抑制自然时效作用;预时效+自然时效态试样,经烘烤硬化处理后,屈服强度和抗拉强度分别达到了465和545 MPa,强度增量分别达到170和95 MPa,同时伸长率达到12.5%。
Effect of pre-aging treatment on mechanical properties and microstructure of Al-Zn-Mg-Cu aluminum alloy was investigated.The micro-hardness and mechanical properties were tested.The microstructure was characterized.The results indicate that the best pre-aging hardening effect of the experimental Al-Zn-Mg-Cu aluminum alloy is achieved while aging at 180℃immediately after solution treatment,during which the peak value reaches 195 HV0.5 and the main hardening phase isη'phase.The optimal pre-aging treatment is under 120℃×10 min.Thus,after 14 days natural aging,the hardness of the alloy is decreased by 13 HV0.5 or 10.7%compared to the solution+natural aging treatment.Finally after bake hardening process,the yield strength and tensile strength of the pre-aged alloy reach 465 MPa and 545 MPa,showing a hardening increase of 170 MPa and 95 MPa,respectively,and the elongation reaches 12.5%.
作者
魏茂源
王洪真
张红
滕敦波
Wei Maoyuan;Wang Hongzhen;Zhang Hong;Teng Dunbo(College of Engineering,Yantai Nanshan University,Yantai Shandong 265700,China;National Engineering Research Center for Plastic Working of Aluminum Alloys,Shandong Nanshan Aluminum Co.,Ltd.,Yantai Shandong 265713,China)
出处
《金属热处理》
CAS
CSCD
北大核心
2020年第7期90-93,共4页
Heat Treatment of Metals
基金
山东省高校科技计划(J18KA028)
龙口市科技计划(2017GG23)。
