Role of phase transition in the unusual microwear behavior of superelastic NiTi shape memory alloy
Role of phase transition in the unusual microwear behavior of superelastic NiTi shape memory alloy
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DOI：
10.1016/j.wear.2005.03.006
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发表时间：
2006-02
期刊：
影响因子：
5
通讯作者：
L. Qian;Q. Sun;Xudong Xiao
中科院分区：
文献类型：
--
作者：
L. Qian;Q. Sun;Xudong Xiao
报道了纳米晶超弹性镍钛多晶形状记忆合金（SMA）优异的微磨损性能。微磨损测试通过Hysitron摩擦压头在22至120°C的温度范围内进行。结果表明，NiTi形状记忆合金具有上级的耐微磨损性相比，传统的摩擦材料，如不锈钢AISI 304，该材料表现出不寻常的硬度依赖性的磨损在一定的温度范围内。随着温度从22 ° C增加到120°C，发现耐磨性随着硬度的增加而急剧降低。进一步的研究和分析证实，在接触和磨损过程中的应力诱导相变在材料的高耐磨性中起着至关重要的作用。通过接触力学分析表明，硬度随温度的增加主要是由于相变应力的增加。所观察到的施加的阈值负荷，对应于在接触区域中的塑性变形的发病受到强烈的影响，在尖端区域的相变过程。对于所研究的超弹性NiTi，可逆相变和不可逆塑性屈服之间的温度依赖性相互作用在磨损性能的温度依赖性中起着关键作用，并且负责观察到的明显异常的硬度-磨损关系。
The excellent microwear performance of nano-grained superelastic nickel titanium (NiTi) polycrystalline shape memory alloy (SMA) is reported in this paper. The microwear test was conducted at temperatures ranging from 22 to 120°C by a Hysitron triboindenter. The results showed that the NiTi SMA has superior microwear resistance compared to traditional tribo-materials such as stainless steel AISI 304 and that the material exhibits unusual hardness dependence of wear within certain temperature regimes. With the increase in temperature from 22 to 120°C, wear resistance was found to decrease anomalously with an increase in hardness. Further investigation and analysis confirmed that the stress-induced phase transition during contact and wear play an essential role in the material's high wear resistance. It is demonstrated through contact mechanics analysis that the increase of hardness with temperature was mainly due to the increase in the phase transition stress. The observed applied threshold load that corresponds to the onset of the plastic deformation in the contact area was strongly influenced by the phase transition process at the tip region. For the investigated superelastic NiTi, the temperature-dependent interplay between reversible phase transition and irreversible plastic yielding plays a key role in the temperature dependence of the wear performance and is responsible for the observed apparent unusual hardness–wear relationships.