Hot Deformation Behavior and Processing Maps of Diamond/Cu Composites

被引:12
作者
Zhang, Hongdi [1 ]
Liu, Yue [1 ]
Zhang, Fan [1 ]
Zhang, Di [1 ]
Zhu, Hanxing [2 ]
Fan, Tongxiang [1 ]
机构
[1] Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, State Key Lab Met Matrix Composites, Shanghai 200240, Peoples R China
[2] Cardiff Univ, Sch Engn, Cardiff CF24 3AA, S Glam, Wales
来源
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 2018年 / 49A卷 / 06期
关键词
HIGH THERMAL-CONDUCTIVITY; HEAT SINK APPLICATIONS; POWDER-METALLURGY; INTERFACIAL MICROSTRUCTURE; DYNAMIC RECRYSTALLIZATION; CU/DIAMOND COMPOSITES; EMERGING CHALLENGES; TENSILE PROPERTIES; MATRIX COMPOSITES; SUPERPLASTICITY;
D O I
10.1007/s11661-018-4547-x
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The hot deformation behaviors of 50 vol pct uncoated and Cr-coated diamond/Cu composites were investigated using hot isothermal compression tests under the temperature and strain rate ranging from 1073 K to 1273 K (800 degrees C to 1000 degrees C) and from 0.001 to 5 s(-1), respectively. Dynamic recrystallization was determined to be the primary restoration mechanism during deformation. The Cr3C2 coating enhanced the interfacial bonding and resulted in a larger flow stress for the Cr-coated diamond/Cu composites. Moreover, the enhanced interfacial affinity led to a higher activation energy for the Cr-coated diamond/Cu composites (238 kJ/mol) than for their uncoated counterparts (205 kJ/mol). The strain-rate-dependent constitutive equations of the diamond/Cu composites were derived based on the Arrhenius model, and a high correlation (R = 0.99) was observed between the calculated flow stresses and experimental data. With the help of processing maps, hot extrusions were realized at 1123 K/0.01 s(-1) and 1153 K/0.01 s(-1) (850 degrees C/0.01 s(-1) and 880 degrees C/0.01 s(-1)) for the uncoated and coated diamond/Cu composites, respectively. The combination of interface optimization and hot extrusion led to increases of the density and thermal conductivity, thereby providing a promising route for the fabrication of diamond/Cu composites. (C) The Minerals, Metals & Materials Society and ASM International 2018.
引用
收藏
页码:2202 / 2212
页数:11
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