再结晶对Ni_(47)Ti_(44)Nb_9形状记忆合金棒相变和织构的影响  

Influence of Recrystallization on Phase Transformation and Texture of Ni_(47)Ti_(44)Nb_9 Shape Memory Alloy Bar

作　　者：颜莹[1] 金伟[2] 

机构地区：[1]东北大学材料物理与化学研究所,辽宁沈阳110004 [2]中国科学院金属研究所,辽宁沈阳110016

出　　处：《稀有金属》2008年第4期404-408,共5页Chinese Journal of Rare Metals

基　　金：核燃料及材料国防科技重点实验室基金资助项目(51481130101ZK0601)

摘　　要：利用光学显微镜(OM),DSC和XRD,研究了直径19 mm Ni47Ti44Nb9热轧棒材再结晶对相变和织构的影响,为该合金棒的实际应用提供理论依据。结果表明:热轧棒从450℃开始发生明显再结晶;从850℃/90 min真空退火棒材的中心到边缘,再结晶晶粒尺寸减小,Ms降低,马氏体转变区间变窄,热滞增大;热轧棒中形成了较强的γ丝织构,600℃/90 min退火后,γ丝织构强度稍有下降,退火温度升到850℃,丝织构明显减弱,等密度线发生漫散,形成了新的织构组分,这有利于改善棒材径向方向的恢复应变。The influences of recrystallization on phase transformation and texture of as-hot-rolled Ni47Ti44Nb9 alloy bar with a diameter of 19 mm were systematically investigated using optical microscope （OM）, differential scanning calorimetry （DSC） and X-ray diffraction （XRD） to provide theoretical basis for application of the alloy bar. The results showed that the recrystallization of the hot-rolled bar started obviously at 450 ℃, and recrystallized grain size was decreased and M, dropped. Temperature ranges of martensitic transforma-tion became narrower and thermal hystereses increased from the center to the edge of the bar vacuum annealed at 850 ℃/90 min F.C. More intensive 7 fibre texture was formed in the as-hot-rolled bar. But intensity of 7 fibre texture in the bar annealed at 600 ℃/90 min F.C was slightly decreased. When annealing temperature was 850 ℃, 7 fibre texture was markedly weakened, the diffusion of the isopycnals occurred, and new texture components were formed, which was beneficial to improving restoration strain of the bar along radial direction.

关 键 词：形状记忆合金 再结晶 织构 相变 Ni47Ti44Nb9棒 

分 类 号：TG146.4[一般工业技术—材料科学与工程] TG139.6[金属学及工艺—金属材料]