Quenching with rapid decompression—a new method for rapid solidification
Quenching with rapid decompression—a new method for rapid solidification
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DOI：
10.1063/1.120542
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发表时间：
1997-12
影响因子：
4
通讯作者：
D. He;Fuxiang Zhang;M. Zhang;R. Liu;Z. Qin;Yingfan Xu;W. K. Wang
中科院分区：
文献类型：
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作者：
D. He;Fuxiang Zhang;M. Zhang;R. Liu;Z. Qin;Yingfan Xu;W. K. Wang
我们报告说，如果适当地选择温度、初始压力和最终压力，施加在结晶点是压力的递减函数的熔体上的压力的快速下降可能相当于快速热淬火。特别是，它可能导致形成亚稳晶或玻璃相块状材料。该方法可能有助于模拟诸如陨石撞击等冲击后的绝热减压。通过快速减压获得的过冷速率νc与压力释放速率νp之间的关系由νc= νp给出，其中k为熔点随压力的下降速率。对Al-Ge体系进行了评价。凝固产物要么是稳定的，要么是亚稳的结晶化合物，这取决于压力释放的速度。实验结果表明，快速减压淬火是产生超过105 Ks−1的高过冷速率的有效方法。
We report that a rapid drop of pressure applied to a melt whose crystallization point is a decreasing function of the pressure may, if the temperature, the initial pressure, and the final pressure are appropriately chosen, be equivalent to a rapid thermal quenching. In particular, it may lead to the formation of metastable crystalline or glassy phases bulk materials. The method might be useful to simulate adiabatic decompressions subsequent to shocks such as meteorite impacts. The relation between the undercooling rate (νc) obtained by rapid decompression and the rate of pressure release (νp) is given by νc=kνp, where k is the drop rate of the melting point with pressure. This method is evaluated for the Al–Ge system. The solidification products are either stable or metastable crystalline compounds, depending on the rate at which the pressure is released. Our experimental results indicate that quenching with rapid decompression is an effective method to generate high undercooling rates exceeding 105 Ks−1.