Strength, deformation, and equation of state of tungsten carbide to 66 GPa
Strength, deformation, and equation of state of tungsten carbide to 66 GPa
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DOI：
10.1016/j.actamat.2021.117301
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发表时间：
2021-09
期刊：
影响因子：
9.4
通讯作者：
B. L. Brugman;F. Lin;M. Lv;C. Kenney-Benson;D. Popov;L. Miyagi;Susannah M Dorfman
中科院分区：
文献类型：
--
作者：
B. L. Brugman;F. Lin;M. Lv;C. Kenney-Benson;D. Popov;L. Miyagi;Susannah M Dorfman
用X射线衍射角色散技术测定了六方碳化钨(WC)在66 GPa准静压和非静压压缩下的强度、织构和状态方程。在Ne压力介质中的准静压压缩表明，纳米晶WC的不可压缩程度略低于块体WC，其体积弹性系数K0分别为377±7和397±7 Gpa，压力导数K0‘分别为3.8±0.3和3.7±0.3。这种不可压缩性随颗粒尺寸的减小与在其他陶瓷中观察到的行为相似。在非静水压力压缩下，WC在塑性屈服时支持∼12-15 Gpa的平均差应力，这发生在∼30 Gpa。WC的强度是各向异性的，(001)面支撑的应力比按平均应变计算的应力高29-42%。用弹性-粘塑性自洽模型进行的模拟表明，由于塑性变形的影响，从晶格应变理论推断的强度可能被高估。塑性变形在压缩方向上产生最大织构，最初是通过{10 1‘0}和{10 1’0}和{10 1‘0；0 0 1&>滑动系统上的棱锥体滑动，然后在∼40-50 Gpa时激活{10 1’1}&2 113&>。
Strength, texture, and equation of state of hexagonal tungsten monocarbide (WC) have been determined under quasi-hydrostatic and non-hydrostatic compression to 66 GPa using angle-dispersive X-ray diffraction in the diamond anvil cell. Quasi-hydrostatic compression in a Ne pressure medium demonstrates that nanocrystalline WC is slightly less incompressible than bulk-scale WC, with respective bulk moduli of K 0= 377±7 and 397±7 GPa and pressure derivatives K 0’= 3.8±0.3 and 3.7±0.3. This decrease in incompressibility with grain size is similar to behavior observed in other ceramics. Under nonhydrostatic compression, WC supports a mean differential stress of∼ 12-15 GPa at plastic yielding, which occurs at∼ 30 GPa. Strength in WC is anisotropic, with the (001) plane supporting 29-42% higher stress than stresses calculated from mean strain. Simulations using an Elasto-ViscoPlastic Self-Consistent model indicate that strength inferred from lattice strain theory may be overestimated due to effects of plastic deformation. Plastic deformation generates a texture maximum near< 2¯ 110> in the compression orientation, initially through prismatic slip on the {10 1¯ 0}< 1¯ 2 1¯ 0> and {10 1¯ 0}< 0001> slip systems, followed by activation of pyramidal slip on {10 1¯ 1}< 2¯ 113> at∼ 40-50 GPa.