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摘要: 对Cd-Sb体系高压下的非品形成过程进行了研究,并详细地从理论上分析了压力对冷却过程的形核自由能、临界冷速的影响。发现高压亚稳相的形成是非晶形成的先决条件,而一般只有那些体积随着温度的升高而减小的体系能形成高压亚稳相。对于此类体系,压力能促进形核,抑制生长,极大地降低临界冷却速度,从而促使高压亚稳相的形成。另外,高压亚稳相的形成存在一临界压力,压力必须大于临界压力方可形成亚稳相。最后,高压亚稳相由于动力学条件的抑制而转变为非晶。Abstract: The high pressure amorphization is studied in this paper, and the influence of pressure was discussed on the nucleation free energy, critical cooling rate during quenching process. Theoretical analyses indicate that the formation of metastable phase (MP) is the prerequisite of that of amorphous phase, and the MP can form only in the system which volume phase transitions expanded during cooling. For these systems, pressure can accelerate nucleation, restrain diffusion, and decrease the critical cooling rate, which results in the formation of MP. There exists a critical pressure, and MP is only formed when pressure is over the critical one. In the end, the MP transforms into amorphous phase as a result of the limitation of dynamic conditions.
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Key words:
- high pressure /
- formation of amorphous bulk /
- metastable phase transition
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Brixner L H. Mater Res Bull, 1972, 7: 879. Whalley E, Mishima O, Hand Y P, et al. Ann NY Acad Sci, 1986, 484: 81. Li D J, Wang J T, Ding B Z. Scripta Metallurgica et Materilia, 1992, 26: 621.
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