Structural evolution of LC4 alloy in making thixotropic billet by SIMA method
来源期刊：中国有色金属学报(英文版)2001年第4期
论文作者：罗守靖 田文彤 张广安
文章页码：547 - 550
Key words：SIMA process; LC4 alloy; microstructure; coarsening mechanism
Abstract: The effect of SIMA process parameters on LC4 alloy's microstructure and the microstructural evolution of various soaking times have been studied. The results show that effective strain in cold deformation before reheating has a great influence on microstructural evolution. Grain size decreases and its shape also approaches to sphericity with increasing effective strain. The amount of liquid phase increases at grain boundaries and grain shape becomes smooth with increasing heating temperature. The main mechanism of grain coarsening is coalescence when eutectic liquid is rare and not totally distributed at all boundaries. Otherwise the main mechanism of grain coarsening is Ostwald ripening and the connection coarsening is more difficult to perform when the regions are nearly full of eutectic liquid.
