快速凝固Al-4Cu-xLi-X合金的显微组织和力学性能  

Microstructure and Mechanical Properties of Rapidly Solidified Al-4Cu xLi-X Alloy

作　　者：方军[1,2] FANG Jun(The 43rd Research Institute of China Electronics Technology Group Corporation,Hefei,230088;Hefei Shengda Electronics Technology Industry Co.,Ltd.,Hefei,230088,China)

机构地区：[1]中国电子科技集团公司第四十三研究所,合肥230088 [2]合肥圣达电子科技实业有限公司,合肥230088

出　　处：《铝加工》2024年第3期15-22,共8页Aluminium Fabrication

摘　　要：采用快速凝固/粉末冶金技术制备Al-4Cu-xLi-X(x=1,2和3)合金,研究合金制备过程中显微组织的演变规律及其对力学性能的影响。结果表明,Li含量对合金粉末的尺寸分布、表面形貌、显微组织和物相组成没有明显影响。热等静压后得到致密的块体合金,随着Li含量升高,组织中第二相的数量不断增加并逐渐形成网状结构;合金抗拉强度随之提高,但是延伸率显著下降。经过热挤压,合金中原始粉末边界充分破碎,第二相沿挤压方向分布,合金强度和延伸率同时提高。Al-4Cu xLi-X(x=1,2 and 3)alloys were prepared by rapid solidification/powder metallurgy.The evolution of micro⁃structure and its effect on mechanical properties during the preparation of alloys were studied.The results show that the Li content has no significant effect on the size distribution,surface morphology,microstructure and phase composition of the alloy powder.The dense bulk alloy was obtained after hot isostatic pressing.With the increase of Li content,the amount of the second phase increases and gradually forms a network structure.The tensile strength of the alloy increases with the increase of Li content,but the elongation de⁃creases significantly.After hot extrusion,the boundary of the original powder in the alloy is fully broken,the second phase distributes along the extrusion direction,and the strength and elongation of the alloy increase simultaneously.

关 键 词：快速凝固 AL-CU-LI合金 显微组织 第二相 力学性能 

分 类 号：TF802.67[冶金工程—有色金属冶金] TG146.21[一般工业技术—材料科学与工程]