Phase selection of ternary intermetallic compounds during solidification of high zinc magnesium alloy  

作　　者：关绍康 张春香 王利国 吴立鸿 陈培磊 汤亚力 

机构地区：[1]School of Materials Science and Engineering,Zhengzhou University [2]Materials Science Division,Argonne Nat ional Laboratory,Argonne,IL60439,USA

出　　处：《中国有色金属学会会刊：英文版》2008年第3期593-597,共5页Transactions of Nonferrous Metals Society of China

基　　金：Project(50571092) supported by the National Natural Science Foundation of China;Project(0523020500) supported by the Excellent Young Scholars Foundation of Henan Province, China

摘　　要：The phase selection of ternary intermetallic compound τphase (Mg32(Al, Zn)49 ) and φ phase (Al2Mg5Zn2) in high zinc magnesium alloys was studied by using scanning electron microscope, X-ray diffractometer and differential scanning calorimeter, etc. The results indicate that, when adding element Si in Mg-8Zn-4Al-0.3Mn (ZA84) alloy, φ phase is promoted, whereas τ phase is inhibited. The Chinese script-type Mg2Si and matrix microstructure are greatly refined, the formation of τ phase is facilitated and φ phase is restrained when modifier Al-AlP master alloy is added in ZA84 alloy containing Si. The kinetics study of phase selection indicates that there is a critical degree of undercooling of the melt. If the undercooling exceeds the critical value, τ phase preferentially forms while φ phase is restrained; otherwise, φ phase preferentially forms while τ phase is restrained.The phase selection of ternary intermetallic compound τ phase （Mg32（Al, Zn）49 ） and φ phase （AI2MgsZn2） in high zinc magnesium alloys was studied by using scanning electron microscope, X-ray diffractometer and differential scanning calorimeter, etc The results indicate that, when adding element Si in Mg-8Zn-4Al-0.3Mn （ZA84） alloy, φ phase is promoted, whereas τ phase is inhibited. The Chinese script-type Mg2Si and matrix microstructure are greatly refined, the formation of τ phase is facilitated and phase is restrained when modifier AbAIP master alloy is added in ZA84 alloy containing Si. The kinetics study of phase selection indicates that there is a critical degree of undercooling of the meR. If the undereooling exceeds the critical value, τ phase preferentially forms while φ phase is restrained; otherwise, φ phase preferentially forms while τ phase is restrained.

关 键 词：高锌镁合金 硅 ALP 相位选择 动理学 

分 类 号：TG146.22[一般工业技术—材料科学与工程]