Specific Heat in a Typical Metallic Glass Former
Specific Heat in a Typical Metallic Glass Former
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DOI：
10.1088/0256-307x/29/4/046402
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发表时间：
2012-04
影响因子：
3.5
通讯作者：
H. Ke;Zuofeng Zhao;P. Wen;Weihua Wang
中科院分区：
文献类型：
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作者：
H. Ke;Zuofeng Zhao;P. Wen;Weihua Wang
研究了一个典型的Pd40Ni10Cu30P20金属玻璃形成系统的比热。结果表明，金属液体的比热约为4.7R(R为气体常数)，且几乎与温度无关。在冷却过程中观察到的玻璃化转变伴随着1.5R的比热下降。金属玻璃的比热与其晶相的比热相似，主要由原子振动贡献。结合结构弛豫和扩散系数的结果，我们证明了金属玻璃形成液中原子运动与比热之间的内在联系。结果支持玻璃化转变是一个伴随着金属过冷液体中大部分原子转变运动在冷却过程中冻结的过程。
The specific heat in a typical Pd40Ni10Cu30P20 metallic glass forming system is investigated. It is found that the specific heat of the metallic liquid is around 4.7R (R is the gas constant) and that it is almost independent of temperature. The glass transition observed during cooling is accompanied by a decrease in the specific heat of 1.5R. The specific heat of the metallic glass is similar to that of its crystalline phases, contributed mainly from atomic vibrations. Combined with the results of the structural relaxation and diffusivities, we demonstrate an intrinsic connection between the atomic motion and the specific heat in the metallic glass-forming liquid. The results support the idea that glass transition is a process accompanied by the freezing of most of the atomic transitional motions in a metallic supercooled liquid during cooling.