道次压下量对2197铝锂合金轧制组织与力学性能的影响  

Effect of Rolling Reduction per Pass on Microstructure and Mechanical Properties of 2197 Al-Li Alloy

作　　者：冀宏亮 边丽萍[1,2,3] 郑毅 刘先文 梁伟 Ji Hongliang;Bian Liping;Zheng Yi;Liu Xianwen;Liang Wei(College of Materials Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,China;Shanxi Key Laboratory of Advanced Magnesium-based Materials,Taiyuan 030024,China;Engineering Research Center of Advanced Metal Composites Forming Technology and Equipment,Taiyuan 030024,China)

机构地区：[1]太原理工大学材料科学与工程学院,山西太原030024 [2]先进镁基材料山西省重点实验室,山西太原030024 [3]先进金属复合材料成形技术与装备教育部工程研究中心,山西太原030024

出　　处：《稀有金属材料与工程》2023年第4期1476-1482,共7页Rare Metal Materials and Engineering

基　　金：国家自然科学基金面上项目(52175355);国家重点研发计划(2018YFA0707304);山西省重点研发计划(201903D121087)。

摘　　要：针对铝锂合金塑韧性、成形性差的问题,本工作通过OM/SEM微观组织分析、拉伸及硬度/电导率测试,研究了在总压下量75%条件下、轧制道次压下量(即10%、30%、30%+60%,分别对应小、中、大道次压下量)对2197铝锂合金组织与力学性能的影响。结果表明:道次压下量显著影响铝锂合金的晶粒结构、析出相的数量及分布。轧制态合金的强度随单道次轧制压下量的增加而显著增加、而塑韧性则明显下降。T8时效处理使析出相大量析出,轧制合金中的Portevin-Le Chatelier(PLC)效应得到消除,小、大道次压下量轧制合金的力学性能得到显著提升。大压下量轧制合金经时效处理后强塑性综合力学性能最高,抗拉强度为384.94 MPa、断后伸长率为12.45%,较小、中道次压下量轧制时效合金分别提高2%、21%和29%、31%。Aiming at the poor ductility,toughness and formability of Al-li alloy,the effect of per-pass reduction on microstructure and mechanical properties of 2197 Al-Li alloy were studied by OM/SEM microstructure analysis,tensile properties and hardness/conductivity test,with a constant total reduction of 75%.The results show that the grain structure,the amount and distribution of precipitates are significantly affected by per-pass reduction.The strength of as-rolled alloy increases significantly with the increase of per-pass reduction,while the ductility and toughness decrease obviously.After T8 aging treatment,a large amount of precipitates are produced and the PLC(Portevin-Le Chatelier phenomenon)effect in the rolled alloy is eliminated.The mechanical properties of the alloy rolled by light and heavy reduction improve significantly.After aging treatment,as-rolled alloy with heavy reduction exhibits the optimal comprehensive mechanical properties with tensile strength of 384.94 MPa and the elongation to fracture of 12.45%,which are 2%,21%and 29%,31%higher than those of the light and middle reduction alloys,respectively.

关 键 词：铝锂合金 轧制 晶粒细化 析出相 力学性能 

分 类 号：TG146.21[一般工业技术—材料科学与工程]