热处理工艺对低温挤压Zn-15Al锌合金组织及性能的影响  

Effects of heat treatment on microstructure and mechanical property of extruded Zn-15AlZn alloy at lower extrusion temperature

作　　者：孙世能[1] 王利卿[1] 任玉平[1] 杨波[1] 秦高梧[1] 

机构地区：[1]东北大学材料各向异性与织构教育部重点实验室,沈阳110819

出　　处：《材料与冶金学报》2016年第1期58-60,65,共4页Journal of Materials and Metallurgy

基　　金：国家自然科学基金资助项目(51171043;51371046);教育部新世纪优秀人才(NECT-12-0109);东北大学基本科研业务费资助项目(N130610002);东北大学优秀博士学位论文培育项目A类

摘　　要：采用拉伸试验和扫描电镜分析技术手段,研究了不同冷却速度对200℃挤压Zn-15Al锌合金的微观组织和室温力学性能的影响.结果表明:经320℃处理1 h后,变形态细小的α(Al)相发生了粗化.经水淬后α(Al)相发生了连续析出,形成了α(Al)+η(Zn)细小的粒状组织,使其强度稍有提高,塑性明显降低.而经空冷后α(Al)相发生了共析分解,形成了细片层状组织,导致其强度提高约1倍,塑性下降约80%.这意味着能够通过热处理工艺来调整变形态Zn-15Al锌合金的力学性能,以满足不同应用领域的要求.The influences of cooling rates during heat treatment on the microstructure and mechanical properties of the extruded Zn- 15 Al Zn- alloy at 200 ℃ have been investigated by tensile test and scanning electron microscopy. The results showthat the fine α（ Al） phase of extruded Zn- 15 AlZn- alloy at 200 ℃ occurred coarsening by heated treatment at 320 ℃ for 1 h. The tensile strength of extruded Zn- 15 AlZn- alloy increased slightly,while the elongation of extruded Zn- 15 Al Zn- alloy decreased significantly after water quenching,because the α（ Al） phase is transformed into α（ Al） ＋ η（ Zn） fine granular structure though continuous precipitation. After air cooling,the tensile strengthen were increased by about 1 times and the elongation decreased by about 80%,Owing to the α（ Al） phase formed a fine lamellar structure decomposition by eutectoid transformation. It is implied that the different mechanical properties can be obtained in the extrusion Zn- 15 AlZn alloy manufactured by heat treatment,and the mechanical properties can be satisfied the requirements of different applications.

关 键 词：Zn-15Al锌合金 热处理 微观组织 力学性能 

分 类 号：TG146.13[一般工业技术—材料科学与工程]