Microstructure and growth morphology of Frank-Kasper phase in rapidly solidified Mg_(32)Al_(17)Zn_(32) ternary alloys  

作　　者：ZHU Man YANG Gencang WAN Diqing WANG Zhijun ZHOU Yaohe 

机构地区：[1]State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi＇an 710072, China

出　　处：《Rare Metals》2009年第4期401-404,共4页稀有金属（英文版）

基　　金：the National Natural Science Foundation of China (No. 50571081);the Aeronautical Science Foundation of China (No. 04G53042) for their financial support

摘　　要：In the present investigation, the microstructures and growth morphology of Mg32（Al,Zn）49 Frank-Kasper phase in rapidly solidified Mg32Al17Zn32 temary alloys were studied in detail. The samples were characterised by X-ray diffraction analysis （XRD）, scanning electron microscopy （SEM）, field-emission scanning electron microscopy （FE-SEM） and energy dispersive spectrum （EDS）. The results show that the microstructures mainly consist of Mg3e（Al,Zn）49 Frank-Kasper phase and interdendritic Mg-rich O-phase. Under rapid solidification condition, Mg32（Al,Zn）49 Frank-Kasper phase reveals a perfect faceted dendritic characteristic in the shape of a three-fold symmetric microstructure with doublet tips in the axes direction. Observations for fracture surfaces show that the growth morphology of Mg32（Al,Zn）49 grains was truncated cubic, and its growth mechanism was also discussed.In the present investigation, the microstructures and growth morphology of Mg32（Al,Zn）49 Frank-Kasper phase in rapidly solidified Mg32Al17Zn32 temary alloys were studied in detail. The samples were characterised by X-ray diffraction analysis （XRD）, scanning electron microscopy （SEM）, field-emission scanning electron microscopy （FE-SEM） and energy dispersive spectrum （EDS）. The results show that the microstructures mainly consist of Mg3e（Al,Zn）49 Frank-Kasper phase and interdendritic Mg-rich O-phase. Under rapid solidification condition, Mg32（Al,Zn）49 Frank-Kasper phase reveals a perfect faceted dendritic characteristic in the shape of a three-fold symmetric microstructure with doublet tips in the axes direction. Observations for fracture surfaces show that the growth morphology of Mg32（Al,Zn）49 grains was truncated cubic, and its growth mechanism was also discussed.

关 键 词：Frank-Kasper phase rapid solidification faceted dendrite growth morphology 

分 类 号：TG146.21[一般工业技术—材料科学与工程] V252[金属学及工艺—金属材料]