Evolution of FCC/BCC interface and its effect on the strengthening of severe drawn Cu-3 wt.% Cr
Evolution of FCC/BCC interface and its effect on the strengthening of severe drawn Cu-3 wt.% Cr
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进化%20of%20FCC/BCC%20界面%20and%20its%20效果%20on%20the%20强化%20of%20严重%20拉制%20Cu-3%20wt.%%20Cr
DOI：
10.1016/j.jallcom.2015.03.226
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发表时间：
2015-08
影响因子：
6.2
通讯作者：
Wang, Hongtao
中科院分区：
文献类型：
--
作者：
Fang, Youtong;Meng, Liang;Liu, Jiabin;Wang, Hongtao
金属复合材料具有高强度和高导电性的优点，引起了人们的极大兴趣。我们以Cu3wt.%Cr复合材料为模型系统，揭示了在较大的拉伸应变范围(η)下的组织-性能关系，并提出了冷拉拔强化机制。在小应变和中等拉应变下，非共格和半共格界面是位错运动和堆积的有效障碍。力学行为可用Hall-Petch关系很好地描述。η<；4.5时的加工硬化是晶粒细化和相界密度增加的直接结果，这可以用线性混合规则很好地模拟。在η>；4.5时观察到偏差，此时强度逐渐达到平台期。显微组织分析表明，由于动态回复过程，在高拉伸应变下很难发生进一步细化。转折点的另一个特征是结构的均质化，即机械合金诱导的相互混合和完全共格。电子衍射和高分辨电子显微镜都清楚地证明了界面相干性的转变。界面的结构均一化可以缓解界面对位错滑移的阻碍，表明存在界面强度极限。在η>；版本4.5中，对混合物的线性规则进行了修改，以解释这一影响。用分段函数描述了Cu-3wt.%Cr复合材料的完整力学行为。
Metal composites have attracted great interest for the combination of high strength and high electrical conductivity. We take the Cu–3 wt.% Cr composite as a model system to reveal the structure–property relations in a large range of drawing strains (η), and propose the strengthening mechanism during cold drawing. At small and moderate drawing strains, the incoherent and semi-coherent interfaces are effective barriers for dislocation motion and pile-up. The mechanical behaviors are described well by the Hall–Petch relation. The work hardening atη< 4.5 is the direct consequence of the grain refinement and the increasing density of phase boundaries, which can be well modelled by a linear rule of mixture. Deviation is observed atη> 4.5, when the strength gradually reaches a plateau. Microstructural analysis reveals that further refinement can hardly occur at high drawing strains due to the dynamic recovery process. Another characteristic of the turning point is the structural homogenization,i.e.the mechanical alloy induced inter-mixing and the full coherency. The transition of the interface coherency is clearly identified by both electron diffraction and high resolution transmission electron microscopy. The structural homogenization at the interface may alleviate the interfacial blockage to the dislocation slipping, indicating the existence of an interfacial strength limit. The linear rule of mixture is modified to account for this effect atη> 4.5. The complete mechanical behavior of the Cu–3 wt.% Cr composite is captured by a piece-wise function.
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影响因子：
2.8
作者：
C. Swenson;W. Marshall;A. Gavrilin;Ke Han;J. Schillig;J. Sims;H. Schneider-Muntau
通讯作者：
C. Swenson;W. Marshall;A. Gavrilin;Ke Han;J. Schillig;J. Sims;H. Schneider-Muntau
DOI：
10.1016/s0921-5093(00)00981-3
发表时间：
2000-10
影响因子：
6.4
作者：
D. Raabe;K. Miyake;H. Takahara
通讯作者：
D. Raabe;K. Miyake;H. Takahara
DOI：
10.1016/0956-716x(92)90115-u
发表时间：
1992-07
期刊：
Scripta Metallurgica Et Materialia
影响因子：
--
作者：
D. Raabe;J. Ball;G. Gottstein
通讯作者：
D. Raabe;J. Ball;G. Gottstein
影响因子：
9.4
作者：
Liu, J. B.;Zhang, L.;Meng, L.
通讯作者：
Meng, L.
影响因子：
6
作者：
E. Snoeck;F. Lecouturier;L. Thilly;M. Casanove;H. Rakoto;G. Coffe;S. Askénazy;J. Peyrade;C. Ro
通讯作者：
E. Snoeck;F. Lecouturier;L. Thilly;M. Casanove;H. Rakoto;G. Coffe;S. Askénazy;J. Peyrade;C. Ro