张代东,蔡彦岑,时小宝,房大庆,原洪加,柴跃生,王枫.高Ca含量Mg-13Zn-0.5Nd合金组织与力学性能[J].稀有金属材料与工程,2018,47(1):119~123.[Zhang Daidong,Cai Yancen,Shi Xiaobao,Fang Daqing,Yuan Hongjia,Chai Yuesheng,Wang Feng.Effect of High Ca on Microstructure and Mechanical Property of Mg-13Zn-0.5Nd alloy[J].Rare Metal Materials and Engineering,2018,47(1):119~123.]
高Ca含量Mg-13Zn-0.5Nd合金组织与力学性能
投稿时间:2015-10-19  修订日期:2016-01-27
中文关键词:  高钙镁合金  生长抑制因子  T6处理  非平衡凝固
基金项目:山西省科技攻关项目(项目号20140321014-04)
中文摘要:
      以气体保护法制备的Mg-xCa-13Zn-0.5Nd(x=3,4,5,6)合金为研究对象,通过光学金相显微镜、扫描电镜观察、能谱分析、XRD物相分析以及硬度和常温力学性能测试,研究了因含Ca量的不同对该类型合金显微组织和力学性能的影响。合金铸态组织主要由α-Mg基体相、α-Mg+Mg6Zn3Ca2共晶相以及第二相Mg2Ca和Mg6Zn3Ca2组成,随着含Ca量的增加,晶粒明显细化。经390℃×8h固溶处理、240℃×8h人工时效处理后,消除了共晶组织连续网状分布状态,使更多的第二相析出且弥散分布,提高了合金的常温力学性能。Ca加入量为4%时,合金在T6处理后表现出最好的综合力学性能,峰时效态合金的屈服强度和抗拉强度达到108MPa和175MPa,伸长率为6.10%,该合金优异的力学性能主要是第二相强化和细晶强化的双重效果。
Effect of High Ca on Microstructure and Mechanical Property of Mg-13Zn-0.5Nd alloy
英文关键词:high-Ca Magnesium Alloy  GRF  T6 heat treament  no equilibrium cooling
英文摘要:
      The Mg-13Zn-xCa-0.5Nd(x=3,4,5,6) alloys containing high-calcium have been prepared under the pretension of a mix gas atmosphere of Ar .The alloys composite were characterized by a variety of techniques: x-ray diffraction, optical metallurgical microscope, scanning electron microscope and mechanical property test. The performance of high Ca on microstructure and mechanical properties of alloy were investigated. The alloy was mainly composed of α-Mg matrix、α-Mg+Mg6Zn3Ca2 eutectic phase and a few amounts of secondary phase(Mg2Ca+Mg6Zn3Ca2)in as-cast state. The grain is extremely refined with the increase of Ca addition. After the solution treatment at 390 oC for 8 h and subsequent aging at 240 oC, the alloy exhibits greatly mechanical properties.The optimum mechanical property of the alloy is obtained by 4% Ca addition after T6 heat treatment. The ultimate tensile strength, yield strength and elongation of the alloy at peak-aged state are 108 MPa, 175 MPa and 6.10% at room temperature respectively. The good mechanical properties are mainly attributed to fine grain strengthening and second phase strengthenin.
作者单位E-mail
张代东 太原科技大学 zhangdaidong138@sina.com 
蔡彦岑 太原科技大学  
时小宝 太原科技大学  
房大庆 太原科技大学  
原洪加 太原科技大学  
柴跃生 太原科技大学  
王枫 古交市银河镁业有限公司  
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