张金龙,路恩皓,朱均,张莹,姜行,尹晨,张祺铭.Mg-9.5Li-2.56Al-2.58Zn合金组织及室温变形行为[J].稀有金属材料与工程,0,():-.[Jinlong Zhang,Enhao Lu,Jun Zhu,Ying Zhang,Hang Jiang,Chen Yin,Qiming Zhang.Microstructure and room temperature deformation behavior of Mg-9.5Li-2.56Al-2.58Zn alloy[J].Rare Metal Materials and Engineering,0,():-].
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Mg-9.5Li-2.56Al-2.58Zn合金组织及室温变形行为
投稿时间:2020-05-25  修订日期:2020-06-23
中文关键词:  Mg-Li合金  显微组织  室温变形行为  本构方程
基金项目:陕西省自然科学基础研究计划资助项目(项目号2019JM-247),大学生创新创业训练计划项目(项目号201911736017)
中文摘要:
      以Mg-9.5Li-2.56Al-2.58Zn合金为研究对象,研究其组织形貌及相组成。并利用UTM5305电子万能试验机对其进行了不同应变速率以及不同变形量的压缩实验,获得真实应力-应变曲线,构建合金的室温变形本构方程。研究压缩前后的合金微观组织和压缩性能演变规律。结果表明,Mg-9.5Li-2.56Al-2.58Zn合金包含α-Mg、β-Li、Al12Mg17、AlLi和MgLiAl2五相,β-Li为基体相,α-Mg相呈条状或块状,纤维状Al12Mg17相位于α-Mg相内部,颗粒状MgLiAl2相分布在晶界上,晶内相AlLi呈颗粒状。固溶处理后合金组织中析出相的数量明显减少,合金强度得到提升。根据Mg-9.5Li-2.56Al-2.58Zn合金真实应力-应变曲线分析了应变速率对流变应力的影响,挤压态和固溶态合金室温压缩都存在峰值应力和峰值后的软化现象,有利于室温成形;并通过线性回归的方式获得不同状态下的材料本构方程常数n以及lnA-(Q/RT)的值,构建了基于Arrhenius模型的本构方程。合金组织随变形量增加被逐渐压扁、拉长,AlLi相有所增多。
Microstructure and room temperature deformation behavior of Mg-9.5Li-2.56Al-2.58Zn alloy
英文关键词:Mg-Li alloy  Microstructure  Room temperature deformation behavior  Constitutive equation
英文摘要:
      The microstructure and phase composition of Mg-9.5Li-2.56Al-2.58Zn alloy were studied. At the same time, the UTM5305 electronic universal testing machine was used to carry out the compression experiments with different strain rate and different deformation amount, to obtain the true stress-strain curve, and to construct the room temperature deformation constitutive equation of the alloy. The microstructure and mechanical properties of the alloy before and after compression were studied.The results show that Mg-9.5Li-2.56Al-2.58Zn alloy consists of five phases: α-Mg, β-Li, Al12Mg17, AlLi and MgLiAl2. β-Li is the matrix phase, α-Mg phase is strip or block, fibrous Al12Mg17 phase is in the interior of α-Mg phase, granular MgLiAl2 phase is distributed on the grain boundary, and intragranular AlLi phase is granular. After solution treatment, the number of precipitates in the alloy structure decreased obviously, and the strength of the alloy increased. According to the real stress-strain curve of Mg-9.5Li-2.56Al-2.58Zn alloy, the effect of strain rate on the flow stress is analyzed. There are peak stress and softening phenomenon after peak value in the compression of extruded and solid solution alloy at room temperature, which is conducive to room temperature forming. The constitutive equation constants n and LnA-(Q/RT) in different states are obtained by linear regression, and the constitutive equation based on Arrhenius model is constructed. With the increase of deformation, the microstructure of the alloy is gradually flattened and elongated, and the AlLi phase is increased.
作者单位
张金龙 西安航空学院材料工程学院 
路恩皓 西安航空学院材料工程学院 
朱均 西安航空学院材料工程学院 
张莹 西安航空学院材料工程学院 
姜行 西安航空学院材料工程学院 
尹晨 西安航空学院材料工程学院 
张祺铭 西安航空学院材料工程学院 
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