冷变形量对LD7-5铝合金性能和组织的影响研究  

Effect of Cold Deformation on Properties and Microstruture of LD7-5 Aluminum Alloy

作　　者：王燕 曹海龙 杨森淋 田宇兴 张玉春 张秋锦 Wang Yan;Cao Hailong;Yang Senlin;Tian Yuxing;Zhang Yuchun;Zhang Qiujin(Southwest Aluminum(group)Co.,Ltd.,Chongqing 402326,China;Chinalco Material Applications Research Institute Co.,Ltd.,Beijing 102209,China;Northwest Aluminum Industry Co.,Ltd.,DingXi 748100,China)

机构地区：[1]西南铝业(集团)有限责任公司,重庆401326 [2]中铝材料应用研究院有限公司,北京102209 [3]西北铝业有限责任公司,甘肃定西748100

出　　处：《有色金属加工》2025年第2期30-33,共4页Nonferrous Metals Processing

摘　　要：通过挤压和冷变形获得9.0%、13.0%、17.0%、21.0%冷变形量的LD7-5合金挤压棒材,利用扫描电镜、力学性能测试等手段,分析了不同冷变形量下LD7-5棒材的组织及力学性能。结果表明,随着冷变形量的增大,再结晶晶粒数量增多,尺寸减小且逐渐呈等轴状。冷变形量增大导致合金中第二相破碎越充分,分布越均匀,同时晶界数量越多,晶界面积越大,强度和延伸率也越大。最后,建立描述LD7-5挤压棒材晶粒尺寸与力学性能的关系的Hall-Petch公式,为通过施加冷变形调控LD7-5合金挤压棒材组织与性能提供了一定的参与依据。In this paper,9.0%,13.0%,17.0%and 21.0%cold deformation of LD7-5 alloy extruded bars are obtained by extrusion and cold deformation.The microstructure and mechanical properties of LD7-5 alloy bars under different cold deformation are analyzed by means of scanning electron microscopy and mechanical property testing.The results show that with the increase of cold deformation,the number of recrystallized grains increases,and their size decreases and becomes equiaxed gradually.With the increase of cold deformation,the second phase in the alloy is broken more fully,the distribution is more uniform,and the number of grain boundaries is larger,the grain boundary area is larger,the strength and elongation are larger.Finally,the Hal-Petch formula describing the relationship between grain size and mechanical properties of LD7-5 extruded bars is established,which provides a certain basis for regulating the microstructure and properties of LD7-5 alloy extruded bars by applying cold deformation.

关 键 词：LD7-5合金 冷变形量 微观组织 力学性能 

分 类 号：TG146.21[一般工业技术—材料科学与工程]