CAJ | 학술논문

采用喷射沉积技术制备Al-27%Si合金，研究半固态二次加热过程中该合金显微组织的演变。结果表明，初晶硅在二次加热过程中发生粗化，并且粗化速率随着二次加热温度的升高而增大，液态区域凝固后出现共晶组织。在二次加热过程中喷射沉积过共晶Al-Si合金的显微组织演变可以分为3个阶段：第一阶段属于固态相转变；在第二阶段 Al 基体周围开始逐渐熔化，熔化区域内初晶硅粗化明显且经水淬后出现共晶组织；第三阶段与第二阶段类似，Al基体熔化。
채용분사침적기술제비Al-27%Si합금，연구반고태이차가열과정중해합금현미조직적연변。결과표명，초정규재이차가열과정중발생조화，병차조화속솔수착이차가열온도적승고이증대，액태구역응고후출현공정조직。재이차가열과정중분사침적과공정Al-Si합금적현미조직연변가이분위3개계단：제일계단속우고태상전변；재제이계단 Al 기체주위개시축점용화，용화구역내초정규조화명현차경수쉬후출현공정조직；제삼계단여제이계단유사，Al기체용화。
The Al-27%Si alloy was prepared by the spray forming process, and its microstructure evolution during the semisolid reheating process was investigated. The results show that, the primary Si phase coarsens during the reheating process and the coarsening rate increases with the increase of reheating temperature. The eutectic phase is produced in the molten region when quenched in the cold water. The microstructure evolution in the semisolid state can be divided into three stages. The remarkable characteristic of the first stage is only a solid-state phase transformation process. However, the region around the α(Al) matrix gradually melts in the second stage. The primary Si in the liquid phase coarsens obviously, and the eutectic phase is produced in the molten region when the specimens are quenched in cold water. In the last stage, the same thing as that in the second stage happens except that all theα(Al) matrixes are melted.