Ti-51.1Ni形状记忆合金相变和低温形变特性（英文）  

Characteristics of Transformation and Low-temperature Deformation of Ti-51.1Ni Shape Memory Alloy

作　　者：杨军[1,2] 毕宗岳[1,2] 田磊[1,2] 王璟丽 刘海璋[1,2] 

机构地区：[1]国家石油天然气管材工程技术研究中心,陕西宝鸡721008 [2]宝鸡石油钢管有限责任公司钢管研究院,陕西宝鸡721008

出　　处：《稀有金属材料与工程》2017年第7期1782-1787,共6页Rare Metal Materials and Engineering

摘　　要：用示差扫描量热仪(DSC),光学显微镜和拉伸试验研究了退火温度对形变处理态Ti-51.1Ni(原子分数,%)形状记忆合金相变和低温形变特性的影响。结果表明,随退火温度升高,合金冷却/加热时相变类型由A→R/M→R→A型向A→R→M/M→R→A型再向A→R→M/M→A(A-母相B2,R-R相,M-马氏体相)型转变,R相变温度和M相变热滞降低,M相变温度升高,R相变热滞变化不大,保持在6.5℃左右。在10℃变形时,400~550℃退火态合金呈现形状记忆效应(SME)+超弹性(SE)特性,600~700℃退火态合金呈现SE特性,随退火温度升高,合金由SME+SE向SE特性转变。合金的退火再结晶温度为590℃,在590~650℃退火后合金可获得50.83%的断裂应变值,塑变性能优良,成型加工温度可选定在590~650℃之间。在使用该合金制作能耗阻尼器及相关缓冲减震装置时退火处理温度可选择大于550℃;制作超弹性器件时,退火处理温度可选择低于400℃或高于600℃。Effects of annealing temperature on the phase transformation and the low temperature deformation characteristics in the deformed Ti-51.1Ni（at%） shape memory alloy（SMA） were investigated by differential scanning calorimetry（DSC）, optical microscope（OM） and tensile test. The results show that the transformation types of Ti-51.1Ni alloy are changing from A→R/M→R→A to A→R→M/M→R→A to A→R→M/M→A（A-parent phase B2, R-R phase, M-martensite phase） upon cooling/heating along with increasing annealing temperature. The R transformation temperatures and martensite temperature hysteresis decrease, while the M transformation temperature increases and the R temperature hysteresis nearly keeps at about 6.5 °C. When deformation happen at 10 °C, the 400~550 °C annealed Ti-51.1Ni SMA exhibits as the shape memory effect（SME） ＋ superelasticity（SE）, the 600~700 °C annealed SMA shows SE, and the characteristics of alloy change from SME ＋ SE to SE. In addition, the annealing recrystallization temperature of Ti-51.1Ni SMA is 590 °C, and the 590~650 °C annealed alloy could obtain excellent capability of plastic deformation and 50.83 % values of fracture strain, so the forming processing temperature could be in the range of 590~650 °C. When the Ti-51.1Ni alloy are used for energy consumption of damper and damping device, the suitable annealing temperature could be higher than 550 °C, and for making superelastic device, the suitable annealing temperature could be below 400 °C or above 600 °C.

关 键 词：TI-NI形状记忆合金 应力诱发马氏体 形状记忆效应 超弹性 相变 形变 

分 类 号：TG139.6[一般工业技术—材料科学与工程]