Semisolid microstructural evolution of (CNTs+Sip)/AZ91D powder compacts prepared from powders by cold pressing and remelting  

作　　者：Pu-Bo Li Wan-Ting Tan Mang-Mang Gao Kuan-Guan Liu 

机构地区：[1]Ningxia Key Laboratory of Photovoltaic Materials,Ningxia University,Yinchuan 750021,China

出　　处：《Rare Metals》2020年第6期733-742,共10页稀有金属（英文版）

基　　金：financially supported by the Ningxia Natural Science Foundation of China(No.2018AAC03031);the Basic Scientific Fund of Ningxia university(No.NGY2018009);the Natural Science Foundation of Ningxia University(No.ZR1702)。

摘　　要：The evolution of semisolid microstructure during partial remelting of(CNTs+Sip)/AZ91 D powder compacts prepared by cold pressing was studied.The results indicate that rapid grain coarsening is driven by the dissolution of eutecticβphase material during the initial heating period of 0-10 min,so the AZ91 D powders with fine equiaxed grains surrounded by intergranular eutectic phases evolve into compact particles.As the heating time proceeds,α-Mg particles were gradually separated by liquid due to the phase transformations ofα-Mg+β→L andα-Mg→L.The primary particles coarsened rather slowly and the as-received Mg powder evolved into nearly spheroidal particles surrounded by liquid phase after partial remelting.The in situ synthesized Mg2 Sip were distributed homogeneously around the CNTs with maintained structural integrity during partial remelting.Moreover,this microstructural evolution was accompanied by densification through pore filling.An ideal semisolid ingot suitable for thixoforming can therefore be obtained by partially remelting a(CNTs+Sip)/Mg powder compact.

关 键 词：Semisolid microstructural evolution DENSIFICATION Phase transformation Coarsening behavior 

分 类 号：TF125.22[冶金工程—粉末冶金]