固溶时效对7K01铝合金组织和硬度及电导率的影响
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摘要
以7K01铝合金为研究对象,对其进行不同温度固溶和时效处理,研究固溶和时效处理对其微观组织和显微硬度及电导率的影响,探究适合7K01合金的最佳固溶和时效处理方式。结果表明,7K01铝合金最佳的固溶温度范围在470～480℃,该温度区间内第二相回溶充分,固溶强化效果最佳,硬度(HRC)为24.7,电导率为15.85MS/m;经150℃×24h时效后,合金硬度(HRC)和电导率达到最高,分别为49.95和36.1MS/m。
The new 7 K01 aluminium alloy was treated by solid solution and aging at different temperatures.The microstructures,micro-hardness and electrical conductivity of the new 7 K01 aluminium alloy during different solid solution and aging treatments were analyzed.The optimized solid solution and aging treatments for 7 K01 aluminium alloy were explored.The results show that the optimized solution temperature range of 7 K01 aluminium alloy is 470～480℃.The second phase is dissolved sufficiently at the temperature range,where the hardness and the electrical conductivity reach 24.7 HRC and 15.85 MS/m,respectively.With aging at 150 ℃ for 24 h,the hardness and the electrical conductivity of 7 K01 aluminium alloy rach 49.95 HRC and 36.1 MS/m,respecively.
The new 7 K01 aluminium alloy was treated by solid solution and aging at different temperatures.The microstructures,micro-hardness and electrical conductivity of the new 7 K01 aluminium alloy during different solid solution and aging treatments were analyzed.The optimized solid solution and aging treatments for 7 K01 aluminium alloy were explored.The results show that the optimized solution temperature range of 7 K01 aluminium alloy is 470～480℃.The second phase is dissolved sufficiently at the temperature range,where the hardness and the electrical conductivity reach 24.7 HRC and 15.85 MS/m,respectively.With aging at 150 ℃ for 24 h,the hardness and the electrical conductivity of 7 K01 aluminium alloy rach 49.95 HRC and 36.1 MS/m,respecively.
引文
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[9] ZANG Q H,YU H S,LEE Y S.Hot deformation behavior and microstructure evolution of annealed Al-7.9Zn-2.7Mg-2.0Cu alloy[J].Journal of Alloys and Compounds,2018,763:25-33.
[2]曾渝,尹志民,潘青林,等.超高强度铝合金的研究现状与发展趋势[J].中南工业大学学报,2002,33(6):592-596.
[3]王洪斌,黄进峰,杨滨,等.Al-Zn-Mg-Cu系合金[J].材料科学导报,2003,17(9):1-4
[4]吴一雷,李永伟,强俊,等.超高强度铝合金的发展与应用[J].航空材料学报,1994,14(1):49-55.
[5]马冬威,王敏,胡志华.固溶处理对7A09铝合金组织和力学性能的影响[J].金属热处理,2014,39(1):38-41.
[6] OLIVEIRA F A,DE BARROS JR M C,CARDOS K R.The effect of RRA on the strength and SCC resistance on AA7050 and AA7150aluminium alloys[J].Mater.Sci.Eng.,2004,A379:321-326.
[7]秦国帅,杨汉嵩,何春霞.高强Al-Zn-Mg系7075合金热处理工艺[J].金属热处理,2015,40(12):92-96.
[8]方磊,赵新奇,陈江华.Al-Zn-Mg基合金多级时效不同热处理阶段的析出行为研究[J].电子显微学报,2012,31(3):202-210.
[9] ZANG Q H,YU H S,LEE Y S.Hot deformation behavior and microstructure evolution of annealed Al-7.9Zn-2.7Mg-2.0Cu alloy[J].Journal of Alloys and Compounds,2018,763:25-33.