| 高压下Pd82Si18合金凝固过程中形成的亚稳相 |
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| 引用本文： | 秦志成 刘勇. 高压下Pd82Si18合金凝固过程中形成的亚稳相[J]. 高压物理学报, 1994, 8(2): 107-112 |
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| 作者姓名： | 秦志成 刘勇 |
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| 作者单位： | 中国科学院物理研究所，中国科学院国际材料物理中心 |
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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。
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| 关 键 词： | 亚稳相 高压淬火 冷却速率 |
| 收稿时间： | 1993-02-23; |
FORMATION OF THE METASTABLE PHASES IN Pd-18 at.% Si ALLOY SOLIDIFIED UNDER HIGH PRESSURE |
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| Qin Zhicheng. FORMATION OF THE METASTABLE PHASES IN Pd-18 at.% Si ALLOY SOLIDIFIED UNDER HIGH PRESSURE[J]. Chinese Journal of High Pressure Physics, 1994, 8(2): 107-112 |
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| Authors: | Qin Zhicheng |
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| Affiliation: | 1. Institute of Physics, Academia Sinica, Beijing 100080, China;2. International Centre for Materials Physics, Academia Sinica, Shenyang 110015, China;3. Institute of Physics, Academia Sinica, Beijing 100080, China |
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| 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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| Keywords: | metastable phase high pressure quenching cooling rate. |
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