Mesoscopic superelasticity, superplasticity, and superrigidity

Mesoscopic superelasticity, superplasticity, and superrigidity
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细观超弹性、超塑性和超刚性

DOI:
10.1007/s11433-012-4662-4
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发表时间:
2012-04
期刊:
Science China-Physics Mechanics & Astronomy
影响因子:
--
通讯作者:
C. Q. Sun
C. Q. Sun
中科院分区:
其他
文献类型:
--
作者:
Ma, Z.;Z. Zhou;Y. Huang;Y. Zhou;C. Q. Sun

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原子欠配位引起的局部键收缩、键强度增加以及相关的温度(T)依赖的原子黏结能和结合能密度,从本质上起源于超塑性、超弹性和超刚性的奇异悖论,这是由从单原子链到介观晶粒的固体尺寸所证明的。悖论遵循这些关系:其中A, B, η 1, d和ΔT mk = T m (K)−T是大小(K)相关的物理参数。tm (K)是熔点。压缩过程中的机械加工硬化和拉伸过程中的自加热从外部调节了测量结果。超塑性在固-准熔-液过渡态中占主导地位。位错的积累和湮灭之间的竞争激活了逆霍尔-佩奇关系。因此,在处理原子力学-热力学问题时,有必要区分局域键能密度增益和原子内聚能损失之间的内在竞争与压力和温度等外在因素。
Atomic-undercoordination-induced local bond contraction, bond strength gain, and the associated temperature (T)-dependent atomic-cohesive-energy and binding-energy-density are shown to originate intrinsically the exotic paradox of superplasticity, superelasticity, and superrigidity demonstrated by solid sizing from monatomic chain to mesoscopic grain. The paradox follows these relationships: where A, B, η 1, d and ΔT mk = T m (K)−T are size (K)-dependent physical parameters. T m(K) is the melting point. Mechanical work hardening during compressing and self-heating during stretching modulate the measured outcome extrinsically. Superplasticity dominates in the solid-quasimolten-liquid transition state. The competition between the accumulation and annihilation of dislocations activates the inverse Hall-Petch relationship. Therefore, it is essential for one to discriminate the intrinsic competition between the local bond energy density gain and the atomic cohesive energy loss from the extrinsic factors of pressure and temperature in dealing with atomistic mechano-thermo dynamics.
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