二次加热组织与半固态轧制
(东北大学 材料与冶金学院， 沈阳 110004)
摘 要: 对单辊搅拌技术制得的A2017半固态材料小热变形后二次加热时的组织演化进行了研究。小热变形后的半固态材料加热到半固态区后可获得细小的球形组织；在加热过程中，由于位错能与界面能的存在以及溶质的扩散使合金发生块状化、再结晶、熔断球化3阶段变化；小变形促进该过程的进行；由于细小球形组织成形性能好，半固态轧材的断裂强度提高了75MPa，延伸率提高了16％。
关键字: 半固态； Al合金； 组织； 性能
little hot deformation and its semi-solid rolling
（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
