Microstructure and growth morphology of Frank-Kasper phase in rapidly solidified Mg32Al17Zn32 ternary alloys

稀有金属（英文版）, 2009, 28(4): 401-404. doi: 10.1007/s12598-009-0078-3

^1, , ^2, , ^3, , ^4, , ^5,

1.State Key Laboratory of Solidifwation Processing, Northwestern Polytechnical University, Xi'an 710072, China

2.State Key Laboratory of Solidifwation Processing, Northwestern Polytechnical University, Xi'an 710072, China

3.State Key Laboratory of Solidifwation Processing, Northwestern Polytechnical University, Xi'an 710072, China

4.State Key Laboratory of Solidifwation Processing, Northwestern Polytechnical University, Xi'an 710072, China

5.State Key Laboratory of Solidifwation Processing, Northwestern Polytechnical University, Xi'an 710072, China

基金项目: 国家自然科学基金(50571081) the Aeronautical Science Foundation of China(04G53042)

Microstructure and growth morphology of Frank-Kasper phase in rapidly solidified Mg32Al17Zn32 ternary alloys

ZHU Man ^1, , YANG Gencang ^2, , WAN Diqing ^3, , WANG Zhijun ^4, , ZHOU Yaohe ^5,

1.State Key Laboratory of Solidifwation Processing, Northwestern Polytechnical University, Xi'an 710072, China

2.State Key Laboratory of Solidifwation Processing, Northwestern Polytechnical University, Xi'an 710072, China

3.State Key Laboratory of Solidifwation Processing, Northwestern Polytechnical University, Xi'an 710072, China

4.State Key Laboratory of Solidifwation Processing, Northwestern Polytechnical University, Xi'an 710072, China

5.State Key Laboratory of Solidifwation Processing, Northwestern Polytechnical University, Xi'an 710072, China

Keywords： Frank-Kasper phase

In the present investigation, the microstructures and growth morphology of Mg32(Al,Zn)49 Frank-Kasper phase in rapidly solidified Mg32Al17Zn32 ternary 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 Mg32(Al,Zn)49 Frank-Kasper phase and interdendritic Mg-rich φ-phase. Under rapid solidification con-dition, Mg32(Al,Zn)49 Frank-Kasper phase reveals a perfect faceted dendritic characteristic in the shape of a three-fold symmetric micro-structure 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.

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Microstructure and growth morphology of Frank-Kasper phase in rapidly solidified Mg32Al17Zn32 ternary alloys

参考文献