材料科学
无定形固体
成核
复合材料
脆性
极限抗拉强度
变形(气象学)
冶金
延展性(地球科学)
结晶学
蠕动
有机化学
化学
作者
Xiayun Song,Rui Guo,Zheng Wang,X.J. Wang,Huijun Yang,Junwei Qiao,Lina Han,Peter K. Liaw,Yucheng Wu
出处
期刊:Intermetallics
[Elsevier]
日期:2019-09-18
卷期号:114: 106591-106591
被引量:6
标识
DOI:10.1016/j.intermet.2019.106591
摘要
The Ni–Mo–P amorphous films were successfully deposited on the CoCrFeNi high-entropy alloys by electroless plating. This work will focus on reviewing and discussing the ambient-temperature mechanical properties, plastic deformation, and cracking mode of the coating-substrate system. The yielding strength (σy) and ultimate tensile strength (UTS) of the specimen plating for 1 h were 260 and 760 MPa, respectively, with 44.4% (σy) and 14.2% (UTS) improvement contrast to the uncoated HEAs (σy and UTS are 180 MPa and 560 MPa, respectively). It is attributed to the back stress and repulsive image stress to suppress the nucleation and mobility of dislocations. Due to the substrate confinement, the deformation model was gradually changed from cracking (with homogeneous flow) to shear banding (with homogeneous flow). Eventually, fully-homogeneous flows occur with reducing the film thickness, and the deformation mechanism map is developed to expound the transition of the deformation mode. The brittle fracture with a high velocity originating from amorphous films leads to cleavage cracking on the surface of the HEA substrate. The thicker film has higher crack velocity and causes deeper cracks penetration into the substrate, reducing the substrate ductility.
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