热处理工艺对Zn-15Al合金组织及力学性能的影响  

Evolution of the Microstructure and Mechanical Properties of Zn-15Al Alloy During Heat Treatment

作　　者：宋振亚 徐高磊 余焕伟 宋博菲 彭孜 SONG Zhen-ya;XU Gao-lei;YU Huan-wei;SONG Bo-fei;PENG Zi(Shaoxing Tianlong Tin Materials Co.,Ltd,Shaoxing 312030,China;Shaoxing University,Shaoxing 312000,China;Shaoxing Special Equipment Testing Institute,Shaoxing 312071,China;School of Materials Science&Engineering,East China University of Science and Technology,Shanghai 200237,China)

机构地区：[1]绍兴市天龙锡材有限公司,浙江绍兴312030 [2]绍兴文理学院,浙江绍兴312000 [3]绍兴市特种设备检测院,浙江绍兴312071 [4]华东理工大学材料科学与工程学院,上海200237

出　　处：《世界有色金属》2024年第23期10-12,共3页World Nonferrous Metals

基　　金：浙江省新产品计划项目(2021D60SA690479)。

摘　　要：研究了Zn-15Al合金热处理后微观组织及力学性能的演化规律。连续挤压后加热冷拉得到的ZA15合金中,细小的α相颗粒沿着挤出方向排列,具有室温超塑性特性。275℃以下退火时,α相增大,拉伸强度随退火温度持续升高。在275℃以上退火且空冷后,得到了层片状共析组织混合着η富锌相晶粒。TEM观察结果表明,粒状组织ZA15塑性变形后很难观察到位错组态;而对于片层组织ZA15,观察到了位错缠结结构,说明位错滑移是重要的变形机制。基于上述研究结果,提出ZA15合金中α粒子的数量密度是Zn-15Al强度演变的关键控制因素。The evolution process of microstructure and mechnical properties of Zn-15wt%Al alloy(referred to as ZA15)after heat treatment was investigated systematically in this paper.Granularαparticles were observed to distributed along the extrusion direction in the as-received ZA15 wire,which showed room-temperature superplasticity.When submitted to anneal treatment below 275℃,αparticle size grown bigger.Meanwhile,the tensile strength always increased with annealing temperature.When annealed above 275℃followed by an air cooling(AC),lamellar microstructure mixed with isolatedηgrain was observed.Transmission electron microscopic(TEM)studies showed that dislocations were rarely observed after a severely plastic deformation in the samples with granular structure.However,for the samples with lamellar structure,dislocation tangles were easily found in lamellas,demonstrating that dislocation slip was another important deformation mechanism.The number ofαparticles in ZA15 was assumed to be a key parameter for understanding the evolution of mechanical properties during the heat treatments.

关 键 词：锌铝合金 热处理 组织结构 强度演化模型 

分 类 号：TG166.7[金属学及工艺—热处理]