挤压比对双相Mg-8Li-6Zn-2Gd合金显微组织、织构和力学性能的影响

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中文摘要：通过显微组织观察、织构分析和拉伸测试等手段研究挤压比对双相Mg-8Li-6Zn-2Gd合金显微组织、织构和力学性能的影响.结果表明:均匀化态Mg-8Li-6Zn-2Gd合金中含有α-Mg、β-Li、MgLiZn、I相和W相.经热挤压后,共晶I相被碾碎成细小颗粒状,而W相保持原有块状形状.合金中α-Mg基体和β-Li基体在热挤压过程中均发生了动态再结晶(DRX),且晶粒随着挤压比的增加逐渐细化.经热挤压后,α-Mg基体的基面织构弱化和柱面织构增强是由于非基面滑移的激活;β-Li基体中形成明显的α和γ纤维织构主要与动态回复与动态再结晶相关.热挤压同时提升Mg-8Li-6Zn-2Gd合金的抗拉强度和伸长率,并在挤压比为16∶1时获得最佳的综合力学性能.

外文标题：Effect of extrusion ratio on microstructure,texture,and mechanical properties of dual-phase Mg-8Li-6Zn-2Gd alloy

外文摘要：The microstructure observation,macrotexture analysis,and tensile test were conducted to investigate the effect of extrusion ratio on the microstructure,texture,and mechanical properties of Mg-8Li-6Zn-2Gd alloy.The results show that the as-homogenized Mg-8Li-6Zn-2Gd alloy consists of α-Mg,β-Li,MgLiZn,I-phase,and W-phase.After hot extrusion,eutectic I-phase is broken into fine particles,while W-phase maintains massive shape.Both α-Mg and β-Li matrices undergo dynamic recrystallization(DRX),and their grains gradually refine with increasing extrusion ratio.For α-Mg matrix,the weakening of basal texture and the strengthening of prismatic texture after hot extrusion are due to the activation of non-basal slip.For β-Li matrix,the appearance of obvious α and γ fiber textures after hot extrusion is associated with the dynamic recovery(DRV)and DRX.The tensile strength and elongation of the alloy are simultaneously improved by hot extrusion,and the best comprehensive mechanical properties are achieved when extrusion ratio is 16∶1.

外文关键词：

Mg-Li alloyicosahedral quasicrystal phaseextrusion ratiodynamic recrystallizationmacrotexturemechanical properties

作者：

孙月花、张帆、杨滨、任建、宋广生

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作者单位：

安徽工业大学先进金属材料绿色制备与表面技术教育部重点实验室,马鞍山 243002

安徽工业大学材料科学与工程学院,马鞍山 243002

关键词：

Mg-Li合金二十面体准晶相挤压比动态再结晶宏观织构力学性能

基金：

Open Project of Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials,Ministry of EducationOpen Project of Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials,Ministry of EducationNatural Science Research Project of Anhui Educational Committee,ChinaNatural Science Research Project of Anhui Educational Committee,China安徽省自然科学基金

项目编号：

GFST2021KF04GFST2021KF09KJ2021A0394KJ2021A03952208085QE124

出版年：

2024

DOI：

10.1016/S1003-6326(23)66437-4

中国有色金属学报(英文版)

中国有色金属学会

中国有色金属学报(英文版)

CSTPCD

影响因子：1.183

ISSN：1003-6326

年,卷(期)：2024.34(3)

参考文献量40