AM50-4%(Zn,Y)合金两步递进固溶与时效处理增强强化（英文）
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摘要
基于热分析结果,对AM50-4%(Zn,Y)(Zn/Y摩尔比为6:1)合金设计并实施一种两步递进固溶处理。利用OM、XRD、SEM/EDS、TEM、拉伸实验和硬度实验研究固溶与时效处理对AM50-4%(Zn,Y)合金组织与力学性能的影响。结果表明:与一步固溶处理相比,两步递进固溶处理能够使Φ和β相充分溶解于基体,获得更高的溶质过饱和度,从而一定程度上增强合金在后续时效处理中的弥散强化效果。在180°C进行时效处理时,Φ相析出对合金综合力学性能的影响要大于β相。经两步递进固溶处理(345°C, 16 h+375°C, 6 h)的AM50-4%(Zn,Y)合金在时效处理(180°C, 12 h)后获得峰时效强度。
AM50-4%(Zn,Y) alloy with a Zn/Y mole ratio of 6:1 was subjected to thermal analysis, and the results were used for designing a two-step progressive solution treatment process. The effects of solution and aging treatments on the microstructure and mechanical properties of the AM50-4%(Zn,Y) alloy were investigated using OM, XRD, SEM/EDS, TEM, tensile test and hardness test. The experimental results demonstrated that the two-step progressive solution treatment could make the Φ and β phases sufficiently dissolve into the matrix which possessed higher supersaturated degree of the dissolved solute compared with the one-step solution treatment. This resulted in a certain enhancement of the precipitation strengthening effect during the subsequent aging process. The precipitation of the Ф phase had a greater impact on the comprehensive mechanical properties of the alloy than β phase precipitation when the aging treatment was performed at 180 °C. The peak aging strength of the AM50-4%(Zn,Y) alloy which was subjected to the two-step progressive solution treatment process (345 °C for 16 h and 375 °C for 6 h) was obtained after the aging treatment at 180 °C for 12 h.
AM50-4%(Zn,Y) alloy with a Zn/Y mole ratio of 6:1 was subjected to thermal analysis, and the results were used for designing a two-step progressive solution treatment process. The effects of solution and aging treatments on the microstructure and mechanical properties of the AM50-4%(Zn,Y) alloy were investigated using OM, XRD, SEM/EDS, TEM, tensile test and hardness test. The experimental results demonstrated that the two-step progressive solution treatment could make the Φ and β phases sufficiently dissolve into the matrix which possessed higher supersaturated degree of the dissolved solute compared with the one-step solution treatment. This resulted in a certain enhancement of the precipitation strengthening effect during the subsequent aging process. The precipitation of the Ф phase had a greater impact on the comprehensive mechanical properties of the alloy than β phase precipitation when the aging treatment was performed at 180 °C. The peak aging strength of the AM50-4%(Zn,Y) alloy which was subjected to the two-step progressive solution treatment process (345 °C for 16 h and 375 °C for 6 h) was obtained after the aging treatment at 180 °C for 12 h.
引文
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[19]KIM B,DO J,LEE S,PARK I.In situ,fracture observation and fracture toughness analysis of squeeze cast AZ51-xSn magnesium alloys[J].Materials Science and Engineering A,2010,527(24-25):6745-6757.
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[21]LAI Wei-jen,LI Yi-yun,HSU Yung-fu,TRONG Shan,WANGWen-hsiung.Aging behaviour and precipitate morphologies in Mg-7.7Al-0.5Zn-0.3Mn(wt.%) alloy[J].Journal of Alloys and Compounds,2009,476(1):118-124.
[2]ZHAO Chao-yong,PAN Fu-sheng,PAN Hu-cheng.Microstructure,mechanical and bio-corrosion properties of as-extruded Mg-Sn-Ca alloys[J].Transactions of Nonferrous Metals Society of China,2016,26(6):1574-1582.
[3]KUMAR P,MONDAL A K,CHOWDHURY S G,KRISHNA G,RAY A K.Influence of additions of Sb and/or Sr on microstructure and tensile creep behaviour of squeeze-cast AZ91D Mg alloy[J].Materials Science and Engineering A,2017,683:37-45.
[4]ZHANG Su-qing,CHEN Ti-jun,CHENG Fa-liang,LI Lei-liang.Microstructural evolution and phase transformation during partial remelting of in-situ Mg_2Si_p/AM60B composite[J].Transactions of Nonferrous Metals Society of China,2016,26(6):1564-1573.
[5]KIM J M,PARK J S,KIM K T.Influence of Sn content on the mechanical and corrosion behavior of AM60 base alloys[J].Advanced Materials Research,2012,378-379:697-700.
[6]ZHU S M,ABBOTT T B,GIBSON M A,NIE J F,EASTON M A.Age hardening in die-cast Mg-Al-RE alloys due to minor Mn additions[J].Materials Science and Engineering A,2016,656:34-38.
[7]ZHANG Jing,GUO Z X,PAN Fu-sheng,LI Zhong-sheng,LUO Xiao-dong.Effect of composition on the microstructure and mechanical properties of Mg-Zn-Al alloys[J].Materials Science and Engineering A,2007,456(1-2):43-51.
[8]ZHU Shao-zhen,LUO Tian-jiao,ZHANG Ting-an,LI Ying-ju,YANG Yuan-sheng.Effects of Cu addition on the microstructure and mechanical properties of as-cast and heat treated Mg-6Zn-4Al magnesium alloy[J].Materials Science and Engineering A,2017,689:203-211.
[9]DONG Xu-guang,FU Jun-wei,WANG Jing,YANG Yuan-sheng.Microstructure and tensile properties of as-cast and as-aged Mg-6Al-4Zn alloys with Sn addition[J].Materials&Design,2013,51:567-574.
[10]XIAO Wen-long,SHEN Yu-sen,WANG Li-dong,WU Yao-ming,CAO Zhan-yi,JIA Shu-sheng,WANG Li-min.The influences of rare earth content on the microstructure and mechanical properties of Mg-7Zn-5Al alloy[J].Materials&Design,2010,31(7):3542-3549.
[11]LIANG Song-mao,MA Yue-qun,CHEN Rong-shi,HAN En-hou.Optimization of heat treatment in AZ64 magnesium alloy[J].Materials transactions,2008,49(5):986-989.
[12]WANG Feng,MA De-zhi,WANG Zhi,MAO Ping-li,LIU Zheng.Microstructure,mechanical properties and solidification behavior of AM50-x(Zn,Y) magnesium alloys[J].Acta Metallurgica Sinica,2016,52(9):1115-1122.(in Chinese)
[13]WANG Jian-li,PENG Qiu-ming,WU Yao-ming,WANG Li-min.Microstructure and mechanical properties of Mg-6Al-4RE-0.4Mn alloy[J].Transactions of Nonferrous Metals Society of China,2006,16(S1):s703-s707.
[14]ZHAO Zu-de,CHEN Qiang,WANG Yan-bin,SHU Da-yu.Microstructures and mechanical properties of AZ91D alloys with Yaddition[J].Materials Science and Engineering A,2009,515(1-2):152-161.
[15]HOU Dan-hui,LIANG Song-mao,CHEN Rong-shi,DONG Chuang,HAN En-hou.Effects of Sb content on solidification pathways and grain size of AZ91 magnesium alloy[J].Acta Metallurgica Sinica(English Letters),2015,28(1):115-121.
[16]WANG Ye-shuang,WANG Qu-dong,MA Chun-jiang,DINGWen-jiang,ZHU Yan-ping.Effects of Zn and RE additions on the solidification behavior of Mg-9Al magnesium alloy[J].Materials Science and Engineering A,2003,342(1-2):178-182.
[17]HOU Dan-hui,LIANG Song-mao,CHEN Rong-shi,DONG Chuang.Solidification behavior and grain size of sand casting Mg-6Al-xZn alloys[J].Acta Metall Sinica,2014,50(5):601-609.(in Chinese)
[18]OHNO M,MIRKOVIC D,SCHMID-FETZER R.Phase equilibria and solidification of Mg-rich Mg-Al-Zn alloys[J].Materials Science and Engineering A,2006,421(1-2):328-337.
[19]KIM B,DO J,LEE S,PARK I.In situ,fracture observation and fracture toughness analysis of squeeze cast AZ51-xSn magnesium alloys[J].Materials Science and Engineering A,2010,527(24-25):6745-6757.
[20]CElOTTO S.TEM study of continuous precipitation in Mg-9wt%Al-1wt%Zn alloy[J].Acta Materialia,2000,48(8):1775-1787.
[21]LAI Wei-jen,LI Yi-yun,HSU Yung-fu,TRONG Shan,WANGWen-hsiung.Aging behaviour and precipitate morphologies in Mg-7.7Al-0.5Zn-0.3Mn(wt.%) alloy[J].Journal of Alloys and Compounds,2009,476(1):118-124.