Wear rate at RT and 100 °C and operating temperature range of microalloyed Cu50Zr50 shape memory alloy
Wear rate at RT and 100 °C and operating temperature range of microalloyed Cu50Zr50 shape memory alloy
复制标题
DOI：
10.1016/j.jallcom.2019.153330
复制
发表时间：
2020-03
影响因子：
6.2
通讯作者：
A. Younes;P. Nnamchi;J. Medina;P. Pérez;Victor M. Villapún;F. Badimuro;S. Kamnis;E. Jimenez-Melero;S. González
中科院分区：
文献类型：
--
作者：
A. Younes;P. Nnamchi;J. Medina;P. Pérez;Victor M. Villapún;F. Badimuro;S. Kamnis;E. Jimenez-Melero;S. González
通过对Cu 50 Zr 50、Cu49.5Zr50Co0.5at和Cu 49 Zr 50 Co 1at的质量损失和磨损行为的研究，研究了Co微合金化对Cu 50 Zr 50形状记忆合金与304不锈钢摩擦副的磨损速率和工作温度范围的影响。%）。对于在15 N下测试的合金，对于具有0.5 at. %的Co，与母体Cu 50 Zr 50 at. %的合金。这主要归因于Co在促进应力诱导马氏体相变（即，加工硬化）。对于在100 °C（100 °C加上摩擦温度1小时）下的磨损测试，质量损失高于在RT下的质量损失，因为马氏体通过等温过程部分地回复为软奥氏体。此外，合金更易于氧化，形成厚的氧化物层，其可以容易地从表面破碎和分离，因此导致比在RT下更高的质量损失。当在100 °C下测试时，Co在促进马氏体转变中的作用可以忽略不计，因为压力-诱发马氏体部分回复为奥氏体，表面形成的厚氧化层不仅掩盖了底层基体的作用，因为它也可以在佩戴时容易地分离。
The effect of microalloying with Co on the wear rate and on the operating temperature range of Cu50Zr50shape memory alloy against 304 stainless steel counterface has been investigated by studying the mass loss and wear behaviour of Cu50Zr50, Cu49.5Zr50Co0.5and Cu49Zr50Co1at. % at room temperature (RT) and 100 °C. For the alloys tested at 15 N, maximum wear resistance is achieved at RT for the alloy with 0.5 at. % Co compared to the parent Cu50Zr50at. % alloy. This is mostly attributed to the effect of Co in promoting stress-induced martensitic transformation (i.e., work-hardening). For wear tests at 100 °C (100 °C plus friction temperature for 1 h), the mass loss is higher than that at RT since martensite partly reverts into soft austenite through an isothermal process. In addition, the alloys are more prone to oxidation with formation of thick oxide layers that can easily get fragmented and detached from the surface thus resulting is higher mass loss than at RT. The effect of Co in promoting martensitic transformation is negligible when testing at 100 °C, since the stress-induced martensite partly reverts into austenite and the thick oxide layer formed on the surface not only masks the effect of the underlaying substrate for it can also easily detach upon wear.