ZTM630镁合金双级时效实验研究
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摘要
通过改变Mg-6Zn-3Sn-0.5Mn合金终时效时间,利用金相显微镜、扫描显微镜、透射电子显微镜观察挤压态ZTM630合金在双级时效后的微观组织特征。结果表明,该合金比较适宜的双级时效参数为90℃×12 h+180℃×8 h,在该参数下合金的抗拉强度、伸长率分别为383.1 MPa、7.667%。双级时效之后,在基体与晶界处都有弥散细小的析出相析出,主要为Mg_2Sn、MgZn_2相化合物。在拉伸过程中弥散细小析出相的析出强化作用和阻碍晶粒移动产生的强化作用,使得合金的力学性能更优。
By changing the final-aging time,the microstructure evolution and mechanical properties of extruded Mg-6 Zn-3 Sn-0. 5 Mn alloy were investigated by means of optical electron microscopy, scanning electron microscopy and transmission electron microscopy. Results showed that through the two-step aging treatment,the suitable parameter was90 ℃×12 h+180 ℃×8 h. Under this parameter,ultimate tensile strength and elongation of the alloy reached 383.1 MPa,7.667%,respectively. After two-step aging treatment,there were dispersed and fine precipitates precipitated in matrix and grain boundaries,which were mainly of Mg_2Sn and MgZn_2 phases. During the process of stretching,the precipitation strengthen effect of dispersed fine precipitated phase and the strengthening effect inhibiting the grain movement made the mechanical properties of the alloy better.
By changing the final-aging time,the microstructure evolution and mechanical properties of extruded Mg-6 Zn-3 Sn-0. 5 Mn alloy were investigated by means of optical electron microscopy, scanning electron microscopy and transmission electron microscopy. Results showed that through the two-step aging treatment,the suitable parameter was90 ℃×12 h+180 ℃×8 h. Under this parameter,ultimate tensile strength and elongation of the alloy reached 383.1 MPa,7.667%,respectively. After two-step aging treatment,there were dispersed and fine precipitates precipitated in matrix and grain boundaries,which were mainly of Mg_2Sn and MgZn_2 phases. During the process of stretching,the precipitation strengthen effect of dispersed fine precipitated phase and the strengthening effect inhibiting the grain movement made the mechanical properties of the alloy better.
引文
[1]雷本祖.解读工业4.0与中国制造2025[EB/OL].[2017-10-21].http://gongkong.ofweek.com/2017-03/ART-310015-8500-30109266.html
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[13]伦玉超,王丽萍,赵思聪,等.ZM6镁合金的双级时效行为[J].金属热处理,2016,41(11):129-132.
[14]ZHANG D F,SHI G L,DAI Q W,et al.Microstructures and mechanical properties of high strength Mg-Zn-Mn alloy[J].Transactions of Nonferrous Metals Society of China,2008,18(S1):59-63.
[15]PARK S S,BAE G T,LEE J G,et al.Microstructure and mechanical properties of twin-roll strip cast Mg alloys[J].Materials Science Forum,2007,539/540/541/542/543(1):119-126.
[16]FU P H,PENG L M,JIANG H Y,et al.Effects of heat treatments on the microstructures and mechanical properties of Mg-3Nd-0.2Zn-0.4Zr(wt.%)alloy[J].Materials Science and Engineering A,2008,486(1/2):183-192.
[2]MORDIKE B L,EBERT T.Magnesium properties-applications-potential[J].Materials Science&Engineering A,2001 302:37-45.
[3]LUO A A.Recent magnesium alloy development for automotive powertrain applications[J].Materials Science Forum,2003,419/420/421/422:57-66.
[4]BUHA J.The effect of Ba on the microstructure and age hardening of an Mg-Zn alloy[J].Materials Science and Engineering A,2008,491(1/2):70-79.
[5]LI Z H,XIONG B Q,ZHANG Y A,et al.Investigation of microstructural evolution and mechanical properties during two-step ageing treatment at 115 and 160℃in an Al-Zn-Mg-Cu alloy pre-stretched thick plate[J].Materials Characterization,2008,59(3):278-282.
[6]NAKATA T,XU C,AJIMA R,et al.Strong and ductile age-hardening Mg-Al-Ca-Mn alloy that can be extruded as fast as aluminum alloys[EB/OL].[2017-10-03].http://dx.doi.org/10.1016/j.actamat.2017.03.046.
[7]HU G S,ZHANG D F,TANG T,et al.Effect of extrusion temperatures on microstructures and mechanical properties of Mg-6Zn-1Mn-4Sn-0.5Y alloy[J].Rare Metal Materials&Engineering,2016,45(5):1111-1116.
[8]JIANG M G,XU C,NAKATA T,et al.Development of dilute Mg-Zn-Ca-Mn alloy with high performance via extrusion[J].Journal of Alloys&Compounds,2016,668:13-21.
[9]CHEN X H,LIUL Z,PAN F S.Strength improvement in ZK60 magnesium alloy induced by pre-deformation and heat treatment[J].Journal of Wuhan University of Technology:Materials Science,2016,31(2):393-398.
[10]FERESHTEH-SANIEE F,FAKHAR N,KARAMI F,et al.Superior ductility and strength enhancement of ZK60 magnesium sheets processed by a combination of repeated upsetting and forward extrusion[J].Materials Science and Engineering:A,2016,673:450-457.
[11]OH-ISHI K,HONO K,SHIN K S.Effect of pre-aging and Al addition on age-hardening and microstructure in Mg-6wt%Zn alloys[J].Materials Science and Engineering A,2008,496(1/2):425-433.
[12]张丁非,徐杏杏,齐福刚,等.Sn对ZM61合金组织与性能的影响[J].稀有金属材料与工程,2013,42(5):931-936.
[13]伦玉超,王丽萍,赵思聪,等.ZM6镁合金的双级时效行为[J].金属热处理,2016,41(11):129-132.
[14]ZHANG D F,SHI G L,DAI Q W,et al.Microstructures and mechanical properties of high strength Mg-Zn-Mn alloy[J].Transactions of Nonferrous Metals Society of China,2008,18(S1):59-63.
[15]PARK S S,BAE G T,LEE J G,et al.Microstructure and mechanical properties of twin-roll strip cast Mg alloys[J].Materials Science Forum,2007,539/540/541/542/543(1):119-126.
[16]FU P H,PENG L M,JIANG H Y,et al.Effects of heat treatments on the microstructures and mechanical properties of Mg-3Nd-0.2Zn-0.4Zr(wt.%)alloy[J].Materials Science and Engineering A,2008,486(1/2):183-192.