Tribology behaviors of Ti-Ni51.5 at％ shape memory alloy with different microstructures and textures

• 作者: Rui Yang Song Li Nan Zhang Chao Wang Ting-Mei Wang Qi-Hua Wang
• 来源期刊: 稀有金属（英文版）
• 年，卷（期）: 2021,（12）
• 所属期刊栏目: ORIGINAL ARTICLES
• 页码范围: 3616-3626
• 页数: 11页
• 语种: 英文

摘要

The microstructure characteristics of TiNi alloy were investigated to elucidate the active deformation mechanisms during hot rolling and the corresponding tri-bology performance.The deformation was mainly domi-nated by a combination of mechanical twinning involving the { 114}B2 and { 112}B2 twins,dislocations,and stacking faults during the manufacturing process.Moreover,various heat treatments were performed to differentiate the dis-crepancies in tribological behaviors of hot-rolled and heat-treated alloys.Hot-rolled microstructures with high defect density approximate to nanoscale precipitates through aging as the wear resistance of the alloy improves,albeit it is softer compared to the aged one.As demonstrated by the X-ray diffraction (XRD) results of the wear tracks,microstructures undergo the stress-induced martensitic(SIM) transformation during dry sliding.From differential scanning calorimetry (DSC) analysis,the martensitic transformation temperature is lowered by defects in the austenite phase.The activation of the SIM transformation can be a sluggish process owing to the effect of twinning,where both primary and secondary twins are involved.Furthermore,a reversible transformation that is related to pseudoelasticity causes a decrease in wear volume at room temperature,which is higher than the austenite finish temperature.Meanwhile,abrasive wear advances toward adhesion.Additionally,the hot-rolled sheet with γ fiber-{ 111 }//ND (normal direction) exhibits better wear resis-tance compared to the sheet with α fiber-{ 100}//ND.