Dry Sliding Wear Behavior of Hafnium-Based Bulk Metallic Glass at Room and Elevated Temperatures
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- 作者：Anup Kumar Keshri ; Lovish Behl…
- 关键词：elevated temperature ; hafnium ; metallic glass ; sliding wear
- 刊名：Journal of Materials Engineering and Performance
- 出版年：2016
- 出版时间：September 2016
- 年：2016
- 卷：25
- 期：9
- 页码：3931-3937
- 全文大小：1,515 KB
- 刊物类别：Chemistry and Materials Science
- 刊物主题：Chemistry
Characterization and Evaluation Materials
Materials Science
Tribology, Corrosion and Coatings
Quality Control, Reliability, Safety and Risk
Engineering Design - 出版者：Springer New York
- ISSN：1544-1024
- 卷排序：25
文摘
Dry sliding wear behavior of hafnium-based bulk metallic glass was studied at two loads (5 and 15 N) and two temperatures (298 and 673 K) using aluminum oxide (Al2O3) ball as a wear counterpart. At 5 N load, wear reduced by ~71% on increasing the temperature from 298 to 673 K. At a higher load of 15 N, the weight loss reduction was much lower (45%) on increasing the temperature from 298 to 673 K. Decreased wear weight loss on increasing the temperature was attributed to the increased hardness of the Hf-based metallic glass at high temperatures. Micro-hardness of the alloy at 293 K was found to be 636 Hv, which gradually increased to 655 Hv on annealing at 673 K. Improvement in the hardness at elevated temperature is attributed to: (1) free volume annihilation, (2) surface oxide formation and (3) nano-crystallites precipitation. Reduced wear at elevated temperature resulted in smaller volume of debris generation that restricted three-body wear to obtain lower coefficient of friction (COF) (0.25-0.35) compared to COF (0.65-0.75) at room temperature.