Effects of Reheating Duration on the Microstructures and Tensile Properties of Thixoforged In Situ Mg2Sip/AM60B Composites
来源期刊：Acta Metallurgica Sinica2014年第5期
论文作者：Tijun Chen Suqing Zhang Yushi Chen Yuandong Li Ying Ma Yuan Hao
文章页码：957 - 967
摘 要：The influences of reheating duration on microstructures and tensile properties of thixoforged in situ Mg2Sip/AM60 B composites have been investigated. The results indicate that the reheating time affects the volume fraction,composition and distribution of the liquid phase, the evolution of the liquid pools within the primary particles, and the morphology and distribution of the Mg2 Si particles of the semisolid feedstock. These changes then affect the subsequent solidification behavior and deformation mechanism during thixoforging, which are responsible for the resulting microstructure and tensile properties. Mg2 Si particles play a strengthening role for the matrix through the load transfer mechanism. The appropriate reheating time is 60 min at 600 °C when the mold preheating temperature is at 300 °C. The ultimate tensile strength and elongation of the resulting composite are up to 209 MPa and 11.9%, respectively.
Tijun Chen，Suqing Zhang，Yushi Chen，Yuandong Li，Ying Ma，Yuan Hao
Key laboratory of Advanced Processing and Recycling of Nonferrous Metals,Lanzhou University of Technology
摘 要：The influences of reheating duration on microstructures and tensile properties of thixoforged in situ Mg2Sip/AM60 B composites have been investigated. The results indicate that the reheating time affects the volume fraction,composition and distribution of the liquid phase, the evolution of the liquid pools within the primary particles, and the morphology and distribution of the Mg2 Si particles of the semisolid feedstock. These changes then affect the subsequent solidification behavior and deformation mechanism during thixoforging, which are responsible for the resulting microstructure and tensile properties. Mg2 Si particles play a strengthening role for the matrix through the load transfer mechanism. The appropriate reheating time is 60 min at 600 °C when the mold preheating temperature is at 300 °C. The ultimate tensile strength and elongation of the resulting composite are up to 209 MPa and 11.9%, respectively.
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