固溶、变形与时效复合处理对AZ61镁合金组织和硬度的影响
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摘要
对AZ61镁合金进行了固溶处理、形变及时效处理的复合处理试验,研究了形变量及时效工艺参数对合金组织和硬度的影响规律。结果表明,AZ61镁合金经固溶处理后,原始组织中枝晶间的大部分网状的Mg_(17)Al_(12)第二相溶入α-Mg基体,形成了过饱和固溶体,合金硬度降低。经形变处理后,出现了形变孪晶组织,同时产生了加工硬化现象,其效果随变形量的增加而增大。将AZ61镁合金形变后再进行时效处理,由于镁合金的低层错能,又重新生成了再结晶等轴晶粒,再结晶之后的晶粒尺寸随形变量的增大而变小。在时效析出第二相的强化作用下,合金硬度随时效温度变化呈先升高后降低的趋势,峰值时效温度为200℃。
The solid solution treatment,deformation and aging composite treatment test of AZ61 magnesium alloy was studied.The influence of deformation amount and aging parameters on the microstructure and hardness of the alloy was studied.The results show that,most of the reticulate Mg_(17)Al_(12)second phase in the original microstructure is dissolved in theα-Mg matrix after the solid solution treatment of the AZ61 magnesium alloy.The supersaturated solid solution is formed and the hardness of the alloy decreases.After deformation,the deformed twin appears.At the same time,work hardening phenomenon is produced,and the effect increases with the increase of deformation amount.When the AZ61 magnesium alloy is subjected to aging treatment after the deformation of the AZ61 magnesium alloy,because of the low staking fault energy of the magnesium alloy,the recrystallizaed equiaxed grains are re-generated.The crystal grain size after the recrystallization decreases with the increase of the deformation amount.The hardness of the alloy increases at first and then decreases with the change of aging temperature under the strengthening action of the second phase precipitated by aging.The peak aging temperature is 200℃.
The solid solution treatment,deformation and aging composite treatment test of AZ61 magnesium alloy was studied.The influence of deformation amount and aging parameters on the microstructure and hardness of the alloy was studied.The results show that,most of the reticulate Mg_(17)Al_(12)second phase in the original microstructure is dissolved in theα-Mg matrix after the solid solution treatment of the AZ61 magnesium alloy.The supersaturated solid solution is formed and the hardness of the alloy decreases.After deformation,the deformed twin appears.At the same time,work hardening phenomenon is produced,and the effect increases with the increase of deformation amount.When the AZ61 magnesium alloy is subjected to aging treatment after the deformation of the AZ61 magnesium alloy,because of the low staking fault energy of the magnesium alloy,the recrystallizaed equiaxed grains are re-generated.The crystal grain size after the recrystallization decreases with the increase of the deformation amount.The hardness of the alloy increases at first and then decreases with the change of aging temperature under the strengthening action of the second phase precipitated by aging.The peak aging temperature is 200℃.
引文
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[12]翟显伟,秦聪祥.AZ41镁合金热变形动力学及其应变硬化行为的研究[J].热加工工艺,2013,42(10):103-105.
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[2]Maria V, Agustina B D, Pipaon J M, et al.Efficient optimization of machining processes based on technical specifications for surface roughness:application to magnesium pieces in the aerospace industry[J].The International Journal of Advanced Manufacturing Technology,2012,60(9):1237-1246.
[3]余琨,黎文献,王日初,等.变形镁合金的研究、开发及应用[J].中国有色金属学报,2003,13(2):277-288.
[4]赵亚忠,彭建,宋成猛,等.高塑性镁合金的研究现状[J].材料导报,2008,22(10):66-69.
[5]Bajargan G, Singh G, Sivakumar D, et al.Effect of temperature and strain rate on the deformation behavior and microstructure of a homogenized AZ31magnesium alloy[J].Materials Science and Engineering A,2013,579(9):26-34.
[6]张会,冯小明.塑性变形对AZ31镁合金组织性能的影响研究[J].锻压技术,2009,34(1):145-148.
[7]张菊梅,蒋百灵,王志虎,等.固溶温度对AZ80镁合金析出相β-Mg17Al12及性能的影响[J].材料热处理学报,2007,28(6):63-66.
[8]马颖,齐玉明,韩秋华,等.固溶处理对AZ91D镁合金时效态微观组织和性能的影响[J].兰州理工大学学报,2017,43(5):1-10.
[9]王瑞权,邱葭菲,石淑琴,等.固溶处理对AZ91镁合金铸棒组织和性能的影响[J].轻合金加工技术,2014,42(8):67-69.
[10]张宝红,张星,王强,等.塑性变形对铸态AZ31镁合金组织和性能的影响[J].材料工程,2005,(5):45-47.
[11]万晓峰,徐雷秋,曹露露,等.变形与退火对ZA31镁合金组织与性能的影响[J].热加工工艺,2017,46(11):51-53.
[12]翟显伟,秦聪祥.AZ41镁合金热变形动力学及其应变硬化行为的研究[J].热加工工艺,2013,42(10):103-105.
[13]王荣滨.稀土在镁合金中的作用与应用研究[J].有色金属加工,2007,36(1):27-29.
[14]郑晓剑,余辉辉,信运昌.利用孪晶界面强韧化镁合金[J].中国材料进展,2016,35(11):819-824.
[15]栾娜,李落星,李光耀,等.AZ80镁合金的高温热压缩变形行为[J].中国有色金属学报,2007,17(10):1678-1684.
[16]蔡刚毅,邓鹏辉,吴海宏.预时效对AZ80镁合金形变热处理组织及性能的影响[J].材料热处理学报,2011,32(10)S:75-78.
[17]田刚,乔军,边福勃,等.镁-铝合金中Mg17Al12相形态改善技术的研究现状[J].轻合金加工技术,2014,42(8):13-17.