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.
出处
《中国有色金属学会会刊：英文版》
EI
CSCD
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
关键词
高锌镁合金
硅
ALP
相位选择
动理学
high-zinc magnesium alloy
Si
AlP
phase selection
kinetics
