高强高机械阻尼的W/NiTi(Nb)形状记忆合金复合材料  

W/NiTi(Nb)Shape MemoryAlloyComposite With High Strength and High Mechanical Damping

作　　者：王珊[1] 于存[1] 郝世杰[1] 郭方敏[1] 余梦莹 姜大强[1] 崔立山[1] 

机构地区：[1]中国石油大学材料科学与工程系,北京102249

出　　处：《金属功能材料》2014年第1期1-4,共4页Metallic Functional Materials

基　　金：国家自然科学重点基金(51231008)

摘　　要：通过真空感应熔炼、锻造及拔丝工艺制备了成分源于Ni48Ti46Nb3W3(原子分数)的W/NiTi(Nb)形状记忆合金原位自生复合材料,采用X射线衍射仪、扫描电镜、能谱仪及拉伸试验机研究了其微观组织结构与力学性能。结果表明:复合材料丝材中W呈横截面为片状的亚微米级纤维,且沿丝轴向均匀分布在NiTi(Nb)基体中,两组元界面结合良好;该复合材料丝材在室温下平台应力达1.2GPa,并呈现高机械阻尼性能。An in situ W/NiTi（Nb） shape memory alloy composite with a nominal composition of Ni48 Ti46 Nb3W3 （at. ~） was fabricated by vacuum induction melting, forging and drawing. X-ray diffraction, scanning electron mi- croscope and energy dispersive spectroscopy were employed to analyze the microstructures and tensile testing ma- chine used to investigate the mechanical properties. It is revealed that the microstructure of the composite wire con- sists of tungsten submicro fibers well dispersed in the TiNi（Nb） matrix and aligned along the wire axial direction, with well-bonded interfaces. The composite wire exhibits high plateau stress up to 1.2 GPa and high mechanical damping capacity at room temperature.

关 键 词：复合材料 NITI记忆合金 增强 机械阻尼 

分 类 号：TG139.6[一般工业技术—材料科学与工程]