摘要
通过扫描电镜观察(SEM)、能谱分析(EDS)、X射线衍射分析(XRD)以及差热分析(DSC)等实验手段,系统地研究了添加微量Sr元素(质量分数0~1%)对铸态Mg-8Zn-4Al(ZA84)镁合金组织中的第二相种类的影响,并阐明了第二相形成与演变的内在机理。实验结果表明:未添加Sr元素的铸态Mg-8Zn-4Al合金组织由Q准晶相和少量Mg_(32)(Al, Zn)_(49)相组成。添加Sr元素后,合金铸态组织中均存在Al_4Sr和Mg_(32)(Al, Zn)_(49)相;其中Al_4Sr相随Sr含量增加而增加,Mg_(32)(Al, Zn)_(49)相随Sr含量增加而减少。在Mg_(32)(Al, Zn)_(49)相中Sr元素以未固溶和固溶两种形式存在,其中未固溶Sr元素的Mg_(32)(Al, Zn)_(49)相具有相对较高的Zn原子浓度和较低的Al原子浓度。相关结果将为第二相析出强化型Mg-8Zn-4Al合金的高强化与耐热化设计提供必要的理论支撑。
To systematically investigate the effect of Sr addition on the second phases in the as-cast Mg-8Zn-4Al magnesium alloy and provide the theoretical basis for the design of the Mg-Zn-Al series alloys containing Sr element,the type and formation mechanism of second phases in the ZA84 as-cast magnesium alloys with low Sr mass fractions(0.1%,0.3%,and 1.0%)were investigated and analyzed by using scanning electron microscope(SEM),energy dispersive spectrometer(EDS),differential scanning calorimetry(DSC),and X-ray diffractometer(XRD).The results indicate that for the ZA84 as-cast alloy without Sr addition,besides the quasicrystal phase(Q),an extra Mg 32(Al,Zn)49 phase with a small amount is found to exist in the alloy.With Sr addition,there are Al4Sr and Mg 32(Al,Zn)49 phases in the as-cast alloy;the Al4Sr phase increases and Mg 32(Al,Zn)49 phase decreases with increase of Sr content.In the Mg 32(Al,Zn)49 phases of the as-cast Mg-8Zn-4Al-(0.1-1)Sr magnesium alloys,Sr mainly exists in two forms,i.e.indissolved and dissolved Sr atoms;in the Mg 32(Al,Zn)49 phase where Sr atoms are not dissolved,the Zn concentration is relatively high and Al concentration is low.The results provide the necessary theoretical support for the design of reinforced and heat-resistant Mg-8Zn-4Al alloy.
作者
吴菊英
李景仁
张晋涛
罗丽
杨明波
吴璐
潘虎成
WU Juying;LI Jingren;ZHANG Jintao;LUO Li;YANG Mingbo;WU Lu;PAN Hucheng(Department of Materials Engineering,Sichuan Engineering Technical College,Deyang,Sichuan 618000,P.R.China;School of Materials Science and Engineering,Northeastern University,Shenyang 110819,P.R.China;Chongqing University of Technology,School of Materials Science and Engineering,Chongqing 400054,P.R.China;State Key Laboratory of Nuclear Fuel and Materials,Nuclear Power Institute of China,Chengdu 610041,P.R.China)
出处
《重庆大学学报》
EI
CAS
CSCD
北大核心
2021年第4期117-128,共12页
Journal of Chongqing University
基金
国家自然科学基金资助项目(U1610253,51971053)
中央高校基本科研业务费项目(N2002011)
辽宁省沈阳材料科学国家研究中心联合研发基金(2019JH3/30100040)。
关键词
镁合金
Sr合金化
第二相
衍射分析
能谱
magnesium alloy
Sr alloying
second phase
diffraction analyses
energy dispersive spectrum
作者简介
吴菊英(1986-),女,讲师,主要从事含Sr镁合金中第二相研究,(E-mail)wujuying@cqu.edu.cn;通讯作者:潘虎成,男,东北大学副教授,硕士生导师,主要研究方向为轻合金的设计与制备,(E-mail)panhc@atm.neu.edu.cn。
