Cooling rate dependence of undercooling of pure Sn single drop by fast scanning calorimetry

Cooling rate dependence of undercooling of pure Sn single drop by fast scanning calorimetry
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通过快速扫描量热法研究纯锡单滴过冷的冷却速率依赖性

DOI:
10.1007/s00339-010-6100-7
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发表时间:
2011-07
期刊:
Applied Physics A-Materials Science & Processing
影响因子:
--
通讯作者:
Changdong Zou
Changdong Zou
中科院分区:
其他
文献类型:
--
作者:
Bin Yang;Yulai Gao;Changdong Zou

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非绝热快速扫描量热法已经发展到现场测量单个金属滴的温度变化的响应,在一个大的范围内的冷却速率跨越四个数量级。特别地,研究了冷却速率对单个10 μm锡滴过冷度的影响。实验结果表明,随着冷却速率的增加,过冷度先显著增加,然后在高冷却速率下缓慢增加,这表明在1000 K/s左右的冷却速率下,过冷度在“交叉”前后对冷却速率的依赖关系为“货架”式,其中两种不同的非均质机制同时起作用。首先,对异相成核过程的特性进行了理论估计,分析了其影响,并展望了进一步研究的可能方向。
Non-adiabatic fast scanning calorimetry has been developed to in-situ measure the response of single metallic drops to temperature changes in a large range of cooling rate spanning four orders of magnitude. In particular, the effect of cooling rate on the degree of undercooling of one 10 μm Sn-drop is studied. The experimental results show that the undercooling could be increased first significantly with increasing cooling rate going over to a stage of slow increase for high cooling rates, which indicates a shelf-like dependence of undercooling level on cooling rate before and after a “crossover” at a cooling rate of about 1000 K/s where two different heterogeneous mechanisms act simultaneously. First theoretical estimates are developed on the specific feature of the heterogeneous nucleation process of the effect analyzed and possible directions of further research are anticipated.
DOI: --
发表时间: 1984
期刊: --
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