Enhanced Mechanical Properties of Metallic Glass Thin Films via Modification of Structural Heterogeneity

Abstract

The structure of Cu50Zr50 and Co56Ta35B9 metallic glass thin films (MGTF) was effectively tailored via various applied substrate temperatures by means of the magnetron sputtering technology. Obviously enhanced hardness and elastic modulus are achieved by different compositional MGTFs by increasing the substrate temperature. Compared with the CuZr MGTFs, the CoTaB MGTF deposited at 473 K displays the smaller strain-rate sensitivity exponent, m, and a weaker spectrum intensity based on the nanoindentation creep test, suggesting its better creep resistance. In addition, the STZ volume of the CoTaB MGTF significantly decreases after depositing at higher temperature. According to the nano-scratch analysis, the CoTaB MGTF at the substrate temperatures of 473 K performs the shallower scratch width and the larger H3/E2 value, indicating its better tribological property.

Mechanical response of metallic glass thin films with different components during nanoindentation and nanoscratch

“…Ren等人 [14] 结合统计学的方法 研究Cu基金属玻璃在4种加载速率下的锯齿流变行为, 结果表明随应变速率的变化, 锯齿的动力学特点由混 沌模式转变为临界自组织模式. Bian等人 [8,10,15] [24,25] . 为探究结构对力学测试的响应, 通 [16,17] 、划痕初始倾斜角 [20,21] 、法 向力 [17,23] .…”