Formation of an icosahedral quasicrystalline phase in Zr65Al7.5Ni10M17.5 (M = Pd, Au or Pt) alloys

被引:78
作者
Inoue, A [1 ]
Saida, J
Matsushita, M
Sakurai, T
机构
[1] Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan
[2] Japan Sci & Technol Corp, Exploratory Res Adv Technol, Inoue Superliquid Glass Project, Sendai, Miyagi 9820807, Japan
来源
MATERIALS TRANSACTIONS JIM | 2000年 / 41卷 / 02期
关键词
zirconium-based quasicrystalline alloy; glass transition; metastable icosahedral phase; two-stage crystallization; nanograin structure;
D O I
10.2320/matertrans1989.41.362
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
An icosahedral (I) phase was found to be formed as a metastable phase in the crystallization process of amorphous Zr65Al7.5Ni10M17.5 (M = Pd, An or Pt) alloys. The three amorphous alloys show an endothermic reaction due to the glass transition, followed by two exothermic peaks. The first exothermic peak is due to the precipitation of an I-phase and the second one results from the transition from the I to crystalline mixed phases of Zr4Al3 + Zr2Ni + Zr2Pd (Zr2Au or ZrPt). The I-phase consists of fine grains with a size of about 10 nm and no distinct residual amorphous phase is seen. The formation of the I-phase in the new Zr-based alloy systems with a large supercooled liquid region and high glass-forming ability is important for the future development of bulk quasicrystalline alloys as basic science and engineering materials.
引用
收藏
页码:362 / 365
页数:4
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