挤压及T5处理对Mg-Zn-Zr-Cu-Ca镁合金组织性能的影响
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摘要
对新型Mg-6Zn-0.6Zr-0.5Cu-0.5Ca铸造镁合金进行挤压形变,研究了挤压及T5时效处理对合金组织性能的影响.采用扫描电镜、能谱仪、X射线衍射仪、维氏显微硬度计、电化学工作站表征分析了合金的组织形貌、物相组成、显微硬度及腐蚀速率.结果表明:热挤压使铸态镁合金发生了动态再结晶,晶粒破碎,析出相明显细化并呈弥散分布,主要物相为α-Mg、Mg Zn2、Mg Zn Cu、以及Mg2Ca相.T5时效处理使挤压态镁合金发生静态再结晶,随着时效时间的延长,析出相先细化后长大,当时效时间为12 h时组织最为致密均匀.铸态和原始挤压态试样的显微硬度值分别为72.94 HV0.1和76.4 HV0.1,随着T5时效处理的进行,合金显微硬度值呈先增后减的趋势,当时效时间为12 h时达到峰值(80.53 HV0.1).电化学测试结果表明,T5时效处理可有效降低镁合金的腐蚀速率,从而提高其耐蚀性.
The new Mg-6 Zn-0.6 Zr-0.5 Cu-0.5 Ca cast magnesium( Mg) alloy was subjected to extrusion deformation,and the effects of the extrusion process and T5 aging treatment on the microstructure and property of Mg alloy were also studied.The morphology,phase constitution,microhardness and corrosion rate of the alloy were characterized by SEM,EDS,XRD,Vickers microhardness tester and electrochemical workstation. The results show that the dynamic recrystallization of as-cast Mg alloy occurs during hot extrusion,the grains arebroken and the precipitated phases are obviously refined and dispersed. The main phases are α-Mg,Mg Zn2,Mg Zn Cu and Mg2 Ca.T5 aging treatment leads to the static recrystallization of the as-extruded Mg alloy.With the increase of the aging time,the precipitates are refined first and then become coarsen. The densest and uniform microstructure occur at the aging time of 12 h. The microhardness for the as-cast and as-extruded specimens were72.94 HV0.1 and 76. 4 HV0.1,respectively.The microhardness increases first and then decreases after a T5 aging treatment,with the peak microhardness of 80. 53 HV0.1 when the aging time reaches 12 h.The electrochemical test results show that T5 aging treatment can effectively reduce the corrosion rate of Mg alloy,thereby improving its corrosion resistance.
The new Mg-6 Zn-0.6 Zr-0.5 Cu-0.5 Ca cast magnesium( Mg) alloy was subjected to extrusion deformation,and the effects of the extrusion process and T5 aging treatment on the microstructure and property of Mg alloy were also studied.The morphology,phase constitution,microhardness and corrosion rate of the alloy were characterized by SEM,EDS,XRD,Vickers microhardness tester and electrochemical workstation. The results show that the dynamic recrystallization of as-cast Mg alloy occurs during hot extrusion,the grains arebroken and the precipitated phases are obviously refined and dispersed. The main phases are α-Mg,Mg Zn2,Mg Zn Cu and Mg2 Ca.T5 aging treatment leads to the static recrystallization of the as-extruded Mg alloy.With the increase of the aging time,the precipitates are refined first and then become coarsen. The densest and uniform microstructure occur at the aging time of 12 h. The microhardness for the as-cast and as-extruded specimens were72.94 HV0.1 and 76. 4 HV0.1,respectively.The microhardness increases first and then decreases after a T5 aging treatment,with the peak microhardness of 80. 53 HV0.1 when the aging time reaches 12 h.The electrochemical test results show that T5 aging treatment can effectively reduce the corrosion rate of Mg alloy,thereby improving its corrosion resistance.
引文
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[21]章晓波,殷俏,马青龙,等.时效处理对挤压态MgGd-Nd-Sr-Zn-Zr合金力学与腐蚀性能的影响[J].中国有色金属学报,2016,26(3):526-534.
[22]CHEN J X,TAN L L,YANG K.Effect of heat treatment on mechanical and biodegradable properties of an extruded ZK60 alloy[J].Bioactive materials,2016,2(1):19-26.
[23]吴志林,吴多祥,袁人枢,等.热处理对静液挤压AZ80镁合金管材腐蚀行为的影响[J].中国有色金属学报,2015,25(2):301-307.
[2]丁文江,吴玉娟,彭立明,等.高性能镁合金研究及应用的新进展[J].中国材料进展,2010,29(8):37-45.
[3]陆国桢,王强,张治民,等.镁合金挤压成形技术的研究进展[J].热加工工艺,2012,41(15):86-89.
[4]慕伟意,李争显,杜继红,等.镁合金的应用及其表面处理研究进展[J].表面技术,2011,40(2):86-91.
[5]汪洋,张修庆,陈舸,等.热挤压及时效对Mg-Zn-Si-Ca镁合金显微组织和力学性能的影响[J].热加工工艺,2013,42(8):163-166;170.
[6]胡光山,张丁非,董于凤,等.挤压态和热处理态Mg-6Zn-1Mn-4Sn-1.5Nd镁合金的显微组织和力学性能[J].中国有色金属学报(英文版),2015,25(5):1439-1445.
[7]ZHU H M,SHA G,LIU J W,et al.Microstructure and mechanical properties of Mg-6Zn-x Cu-0.6Zr(wt.%)alloys[J].Journal of alloys and compounds,2011,509(8):3526-3531.
[8]朱红梅,罗承萍,刘江文,等.Cu元素对ZK60铸造镁合金显微组织和力学性能的影响[J].Transactions of nonferrous metals society of China,2014,24(3):605-610.
[9]PARK S J,JUNG H C,SHIN K S.Deformation behaviors of twin roll cast Mg-Zn-XCa alloys for enhanced roomtemperature formability[J].Materials science and engineering,2017,679:329-339.
[10]DU Y Z,QIAO X G,ZHENG M Y,et al.Effect of microalloying with Ca on the microstructure and mechanical properties of Mg-6 mass%Zn alloys[J].Materials&design,2016,98:285-293.
[11]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 and compounds,2016,668:13-21.
[12]马斌,王建利,郭永春,等.Ca含量对Mg-Ca合金组织与力学性能的影响[J].热加工工艺,2014,43(6):4-8.
[13]邝亚飞,王泽辉,房大庆,等.时效处理对热挤压Mgx Zn(x=1,3,5)-Y合金组织与力学性能的影响[J].中国稀土学报,2016,34(5):600-605.
[14]SUN Y,KONG M X,JIAO X H.In-vitro evaluation of Mg-4.0Zn-0.2Ca alloy for biomedical application[J].Transactions of nonferrous metals society of China,2011,21(增刊2):252-257.
[15]张丁非,朱曾涛,吴颖,等.热处理对Mg-Zn-Mn镁合金组织和性能的影响[J].材料热处理学报,2013,34(2):90-95.
[16]HUANG X,CHINO Y,YUASA M,et al.Microstructure and mechanical properties of AZX912 magnesium alloy extruded at different temperatures[J].Materials science and engineering,2017,679:162-171.
[17]李艳辉,李保成,尹丛娟.时效处理对AZ80镁合金组织与性能的影响[J].热加工工艺,2009,38(10):172-174;178.
[18]张丁非,赵霞兵,石国梁,等.挤压和热处理对ZM61镁合金组织和性能的影响[J].中国有色金属学报,2012,22(1):53-61.
[19]魏溆桐,崔君军,于丽君,等.固溶处理对挤压态WE43镁合金显微组织和晶粒度的影响[J].金属热处理,2016,41(6):121-125.
[20]UEMATSUA Y,TOKAJI K,MATSUMOTO M.Effect of aging treatment on fatigue behaviour in extruded AZ61and AZ80 magnesium alloys[J].Materials science and engineering,2009,517(1/2):138-145.
[21]章晓波,殷俏,马青龙,等.时效处理对挤压态MgGd-Nd-Sr-Zn-Zr合金力学与腐蚀性能的影响[J].中国有色金属学报,2016,26(3):526-534.
[22]CHEN J X,TAN L L,YANG K.Effect of heat treatment on mechanical and biodegradable properties of an extruded ZK60 alloy[J].Bioactive materials,2016,2(1):19-26.
[23]吴志林,吴多祥,袁人枢,等.热处理对静液挤压AZ80镁合金管材腐蚀行为的影响[J].中国有色金属学报,2015,25(2):301-307.