二次加熱組織與半固態(tài)軋制
(東北大學(xué) 材料與冶金學(xué)院， 沈陽 110004)
摘 要: 對(duì)單輥攪拌技術(shù)制得的A2017半固態(tài)材料小熱變形后二次加熱時(shí)的組織演化進(jìn)行了研究。小熱變形后的半固態(tài)材料加熱到半固態(tài)區(qū)后可獲得細(xì)小的球形組織；在加熱過程中，由于位錯(cuò)能與界面能的存在以及溶質(zhì)的擴(kuò)散使合金發(fā)生塊狀化、再結(jié)晶、熔斷球化3階段變化；小變形促進(jìn)該過程的進(jìn)行；由于細(xì)小球形組織成形性能好，半固態(tài)軋材的斷裂強(qiáng)度提高了75MPa，延伸率提高了16％。
關(guān)鍵字: 半固態(tài)； Al合金； 組織； 性能
little hot deformation and its semi-solid rolling
LIU Xiang-hua, CHEN Yan-bo
（School of Materials and Metallurgy,
Northeastern University, Shenyang 110004, China）
Abstract:By using A2017 semi-solid material manufactured by Single-Roll Stirring(SRS) process, the microstructure evolution during the process of remelted A2017 semisolid alloy with little hot deformation was studied. Finer spherical microstructure was obtained after it was remelted to semi-solid temperature. Due to energies of dislocations and internal surface of microstructure and solute diffusion, A2017 alloy changes its microstructure, which includes three steps during heating process: conglomeration, recrystalization and spherodization. Little deformation accelerates the process described as above. Because of good forming property of spherical structure, the crack strength of products obtained by semi-solid rolling process is improved by 75MPa, and elongetion is improved by 16%.
Key words: semi-solid; Al base alloy; microstructure; properties
