Effect of Heating Rate for Solid Solution on Microstructure and Properties of Al-10.78Zn-2.78Mg-2.59Cu Aluminum Alloy
摘 要
分别以3.6,180℃·h-1的升温速率将Al-10.78Zn-2.78Mg-2.59Cu铝合金升温至470℃进行固溶处理以及后续时效处理,研究了升温速率对试验合金显微组织和性能的影响。结果表明:较高升温速率下试验合金的平均晶粒尺寸和晶界平均取向角比较低升温速率下的大,小角度晶界占比更小,力学性能更低,导电性能更高;两种升温速率下试验合金的拉伸断口均存在明显韧窝,断裂方式均为穿晶断裂;升温速率对耐腐蚀性能影响不明显,晶间腐蚀深度均在30~100 μm之间,晶间腐蚀等级为3级,剥落腐蚀等级为PC级;对试验合金屈服强度贡献最大的是固溶和时效沉淀析出强化,慢速升温能够有效提高试验合金的屈服强度。
Abstract
Al-10.78Zn-2.78Mg-2.59Cu aluminum alloy was heated to 470℃ at the heating rates of 3.6℃·h-1 and 180℃·h-1, respectively, then treated by solid solution, and aged subsequently. The effects of heating rate on the microstructure and properties of tested alloy were studied. The results show that the average grain size and the average orientation angle of grain boundaries in tested alloy at the relatively high heating rate was higher, the fraction of low angle grain boundaries was smaller, the mechanical properties were lower and the conductivity was higher than those at the relatively low heating rate. Dimples existed obviously on the tensile fracture of tested alloy at the two heating rates, and the fracture modes were both transgranular. The effect of heating rate on corrosion resistance was little; the intergranular corrosion depth was between 30 μm and 100 μm, the intergranular corrosion grade was 3, and the peeling corrosion grade was PC. The solid solution and aging precipitation strengthening made the most important contribution to yield strength of the tested alloy. Heating up slowly can improve yield strength of the tested alloy effectively.
中图分类号 TG146.2 DOI 10.11973/jxgccl201808005
所属栏目 试验研究
基金项目 江苏省科学计划产学研联合创新资金资助项目(BY2015064-01);江苏省科技成果转化专项基金资助项目(BA2016126);江苏省工业科技支撑计划项目(BE2008118);江苏大学优秀青年学术骨干培育专项基金资助项目
收稿日期 2017/7/28
修改稿日期 2018/7/14
网络出版日期
作者单位点击查看
备注张冲(1993-),男,河南南阳人,硕士研究生
引用该论文: ZHANG Chong,XU Xiaojing,ZHANG Jie,HUANG Peng,DU Donghui,JIA Weijie. Effect of Heating Rate for Solid Solution on Microstructure and Properties of Al-10.78Zn-2.78Mg-2.59Cu Aluminum Alloy[J]. Materials for mechancial engineering, 2018, 42(8): 24~28
张冲,许晓静,张洁,黄鹏,杜东辉,贾伟杰. 固溶升温速率对Al-10.78Zn-2.78Mg-2.59Cu铝合金组织与性能的影响[J]. 机械工程材料, 2018, 42(8): 24~28
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【13】DIXIT M, MISHRA R S, SANKARAN K K. Structure-property correlations in Al 7050 and Al 7055 high-strength aluminum alloys[J]. Materials Science and Engineering:A. 2008, 478(1):163-172.
【14】MYHR O R, GRONGØ, ANDERSEN S J. Modelling of the age hardening behaviour of Al-Mg-Si alloys[J]. Acta Materialia, 2001, 49(1):65-75.
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