應(yīng)力誘發(fā)馬氏體相變的影響
(1. 西安交通大學(xué) 金屬材料強(qiáng)度國家重點(diǎn)實(shí)驗(yàn)室，西安 710049;
2. 西北有色金屬研究院，西安 710016)
摘 要: 研究應(yīng)變速率對β固溶處理的Ti-10V-2Fe-3Al合金應(yīng)力誘發(fā)馬氏體相變的影響。結(jié)果表明，隨著應(yīng)變速率由5×10−4 s−1增加到1 500 s−1，合金都發(fā)生應(yīng)力誘發(fā)馬氏體轉(zhuǎn)變，且誘發(fā)應(yīng)力隨著應(yīng)變速率的增加而增加。金相形貌及XRD分析顯示，在所有的應(yīng)變率下，合金拉伸后的微觀組織均由針片狀α″相和β基體相組成。應(yīng)用熱激活界面運(yùn)動(dòng)模型及拉伸過程的溫度升高解釋了隨著應(yīng)變速率的增加，誘發(fā)應(yīng)力增加的現(xiàn)象。
關(guān)鍵字: Ti-10V-2Fe-3Al；應(yīng)力誘發(fā)馬氏體；誘發(fā)應(yīng)力；應(yīng)變速率
β solution treated Ti-10V-2Fe-3Al alloy
（1. State Key Laboratory for Mechanical Behavior of Materials,
Xi’an Jiaotong University, Xi’an 710049, China;
2. Northwest Institute for Nonferrous Metal Research, Xi’an 710016, China）
Abstract:The influence of strain rate on the stress induced martensitic transformation in β solution treated Ti-10V-2Fe-3Al alloy was investigated. The results show that the stress induced martensitic transformation takes place in β solution treated Ti-10V-2Fe-3Al alloy with the strain rate increasing from 5×10−4 s−1 to 1 500 s−1, and the trigger stress increases with the strain rate increasing. Optical microscopy and XRD pattern analysis show that the microstructures are composed of acicular α″ and β matrix for all tensile specimens at all strain rates. The dependence of the trigger stress on strain rate was explained in terms of the thermally activated interface movation model and generated temperature increment during deformation.
Key words: Ti-10V-2Fe-3Al; stress induced martensitic transformation; trigger stress; strain rate
