Ti-Ni-Gd形状记忆合金的马氏体相变  

Martensitic transformation of Ti-Ni-Gd shape memory alloy

作　　者：刘爱莲[1] 吴冶[1] 蔡伟[1] 李民 

机构地区：[1]哈尔滨工业大学材料科学与工程学院材料物理与化学系,黑龙江哈尔滨150001 [2]驻黎明公司军代表室,辽宁沈阳110000

出　　处：《功能材料》2006年第11期1765-1767,共3页Journal of Functional Materials

基　　金：国家自然科学基金(50471018)

摘　　要：采用电弧炉制备了添加不同Gd含量的Ti- Ni-Gd三元合金,利用DSC、X射线衍射仪研究了重稀土元素Gd对Ti-50．7Ni合金的马氏体相变的影响。结果表明添加重稀土元素Gd后,Gd含量不超过2% (原子分数)时,淬火态的Ti-Ni-Gd三元合金中分别发生两步马氏体相变,Gd含量为10%(原子分数)时,合金中发生了一步马氏体相变,同时稀土元素Gd的加入能明显提高Ti-Ni合金的相变温度。Ti-Ni-Gd合金中马氏体仍为B19’单斜结构,而且马氏体的点阵参数随Gd的加入发生明显变化,晶胞产生畸变。Martensitic transformation of （Ti49.3 Ni50. 7 ）1-x Gdx （x = 0, lat %, 2at %, 10at % ） shape memory alloys are investigated by X-ray diffraction （XRD） and differential scanning calorimetry （DSC）. The results show that the martensitic transformation type differs with different content of Gd adding to Ti-Ni alloys. In the alloy containing 2at% Gd, a two-step martensitic transformation is observed, whereas a one-step martensitic transformation is observed in the alloy containing 10at% Gd. The martensitic transformation temperatures increase rapidly with increasing Gd content to 2at%, and then tend to be stable when the Gd content is further increased, B19＇ martensite is observed in Ti-Ni-Gd alloys and its lattice is distorted with Gd addition.

关 键 词：Ti—Ni形状记忆合金 稀土元素Gd 马氏体相变 

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