摘要
Applying XRD, DTA, SEM and TEM techniques, an investigation on the solidification microstructure and solidification sequence of Mg-rich Mg-28%Zn-2%Y (mole fraction) alloy was carried out. It is found that, α-Mg dendrites, Mg7Zn3 phase and icosahedral quasicrystal phase coexist in the as-solidified alloy, where the icosahedral quasicrystal, whose structure is indentified to be a face-centered type, originates from a peritectic reaction occurring at 416 ℃. The primary phase of this peritectic reaction has the composition of Mg20Zn66Y14, which is coincident with the H phase reported by TSAI as (Zn, Mg)5Y. Furthermore, the single I-phase grain morphology was observed and its growth evolution was also discussed.
Applying XRD, DTA, SEM and TEM techniques, an investigation on the solidification microstructure and solidification sequence of Mg-rich Mg-28%Zn-2%Y （mole fraction） alloy was carried out. It is found that, a-Mg dendrites, Mg7Zn3 phase and icosahedral quasicrystal phase coexist in the as-solidified alloy, where the icosahedral quasicrystal, whose structure is indentified to be a face-centered type, originates from a peritectic reaction occurring at 416 ℃. The primary phase of this peritectic reaction has the composition of Mg20Zn66Y14, which is coincident with the H phase reported by TSAI as （Zn, Mg）5Y. Furthermore, the single I-phase grain morphology was observed and its growth evolution was also discussed.
出处
《中国有色金属学会会刊：英文版》
EI
CSCD
2007年第3期586-589,共4页
Transactions of Nonferrous Metals Society of China
基金
Projects(50571081
50671083) supported by the National Natural Science Foundation of China
Project(04G53024) supported by the Aeronautical Foundation of China
关键词
锰锌钇合金
准晶体
显微结构
凝固状态
Mg-Zn-Y alloy
icosahedral quasicrystal
microstructure
solidification
