(西北有色金屬研究院 金屬多孔材料國(guó)家重點(diǎn)實(shí)驗(yàn)室，西安 710016)
摘 要: 綜合利用力學(xué)測(cè)試平臺(tái)、數(shù)字圖像相關(guān)技術(shù)、X射線衍射分析、掃描電子顯微觀察等方法研究Ti-28%Ta合金的顯微組織和拉伸性能，并對(duì)斷口顯微形貌進(jìn)行分析。結(jié)果表明：Ti-28%Ta合金微觀組織由主要的β相和少量的α″馬氏體相組成；通過(guò)對(duì)Ti-28%Ta合金的拉伸性能分析，并結(jié)合循環(huán)往復(fù)拉伸測(cè)試實(shí)驗(yàn)，表明Ti-28%Ta具有優(yōu)異的超彈性和塑性(斷裂時(shí)的應(yīng)變量為28%)；通過(guò)對(duì)斷口分析，證實(shí)Ti-28%Ta合金的斷裂方式為韌性斷裂。
關(guān)鍵字: 超彈性；馬氏體相變；TiTa合金；拉伸性能；數(shù)字圖像相關(guān)技術(shù)
（State Key Laboratory of Porous Metal Materials, Northwest Institute for Nonferrous Metal Research, Xi’an 710016, China）
Abstract:The mechanical testing platform, digital image correlation technology, X-ray diffraction analysis and scanning electron microscopy were used to study the microstructure and tensile properties of Ti-28%Ta alloy, and the fracture morphologies were analyzed. The results show that the microstructure of Ti-28%Ta alloy is composed of main β phase and a small amount of α″ martensite phase. The tensile properties of Ti-28%Ta alloys and cyclic tensile tests show that Ti-28%Ta alloys have excellent superelasticity and plasticity (fracture elongation is 28%). The fracture analysis proves that Ti-28%Ta alloys have excellent superelasticity and plasticity. The fracture mode is ductile fracture.
Key words: superelasticity; martensitic phase transformation; TiTa alloy; tensile property; digital image correlation
