Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 609, Issue -, Pages 235-240Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2014.05.007
Keywords
TiNiNb alloy; Elemental powder sintering; Microstructure; Mechanical properties
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Funding
- Doctoral Student Research Innovation Project in Hunan Province [CX2013D055]
- Fundamental Research Funds for the Central Universities of Central South University [2012zztsa012]
- National Natural Science Foundation of China [51274247]
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Porous TiNi binary and TiNiNb ternary alloys of four compositions (Ti50Ni47.5Nb2.5, Ti50Ni45Nb5, Ti50Ni42.5Nb7.5, and Ti50Ni40Nb10) were fabricated by the elemental powder sintering process. The effects of Nb addition on microstructure and mechanical properties of TiNi(Nb) alloys were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM) and tensile tests, respectively. With the increase of Nb contents, the TiNi matrix as the main phase is always retained, while the intensity of its diffraction peak gradually became weak with the appearance of beta-Nb and TiNb phases. Most Nb particles are well-distributed in the TiNi matrix and (Ti,Nb)(2)Ni phase is found in the binding domain between Nb phase and TiNi phase. The tensile strength and elastic modulus of TiNiNb alloys increase with the increase of Nb contents, due to the solid solution strengthening effect of Nb-rich particles, the enlarged sintering neck and the strengthened bond between particles. Consequently, Nb plays a crucial role in adjusting composition and improving microstructure and mechanical properties of TiNiNb alloys. (C) 2014 Elsevier B.V. All rights reserved.
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