Formation of the Metastable Phases in Pd-18 at.% Si Alloy Solidified under High Pressure
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摘要: 使用X射线衍射、差热分析、透射电镜及Ｘ射线能谱分析，研究了Pd82Si18合金在高压下的凝固特点及所形成的相的结构和稳定性。在5.5 GPa压力下以100 K/s的冷却速率淬火，得到了面心立方结构钯硅固溶体（MS-Ⅰ），其点阵常数为a=0.388 3 nm。与钯硅固溶体共存的还有另一未知结构亚稳相（MS-Ⅱ）。在700 K时上述亚稳相转变成平衡相Pd+Pd3Si。Abstract: The solidification characteristic of liquid Pd-18 at.% Si alloy under high pressure was investigated by using X-ray diffraction, DTA, TEM, SEM and X-ray energy spectrum. The mixture of MS-Ⅰ and MS-Ⅱ metastable phases was obtained during the solidification of the alloy under 5.5 GPa with a cooling rate of 100 K/s. The former has a fee structure with the lattice parameter of a=0.388 3 nm. MS-Ⅰand MS-Ⅱ will transform into the equilibrium phase Pd and Pd3Si above 700 K.
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Key words:
- metastable phase /
- high pressure quenching /
- cooling rate
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