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朱莹莹,王海振,闻光远,高智勇,蔡伟.高速撞击Ti44Ni47Nb9合金相变行为及力学性能研究[J].稀有金属材料与工程(英文),2018,47(1):317~320.[Yingying Zhu,Haizhen Wang,Guangyuan Wen,Zhiyong Gao and Wei Cai.Phase transformation and mechanical properties of Ti44Ni47Nb9 alloy after high-velocity impact[J].Rare Metal Materials and Engineering,2018,47(1):317~320.]
Phase transformation and mechanical properties of Ti44Ni47Nb9 alloy after high-velocity impact
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Received:December 01, 2015  Revised:March 13, 2016
DOI:
Key words: Ti44Ni47Nb9 alloy  high-velocity impact  phase transformation  microstructure  mechanical properties
Foundation item:国家自然科学基金资助(项目号51571074)
Author NameAffiliation
Yingying Zhu,Haizhen Wang,Guangyuan Wen,Zhiyong Gao and Wei Cai  
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Abstract:
      Aiming at the urgent demand for reliability assessment of TiNi based alloy working in space, Ti44Ni47Nb9 alloy is impacted at 1020 m/s using a powder gun. Phase transformation, microstructure and mechanical properties in Ti44Ni47Nb9 alloy induced by impact are investigated. The results show that no intermediate phase is formed along the impact direction, the phase transformation temperature shifts to a lower temperature along 45° and vertical to the impact direction of impacted Ti44Ni47Nb9 alloy. A large number of cracks appear at the bottom of the crater and walls, there are martensite plates in TiNi matrix, and many dislocations exist in the β-Nb particles and TiNi matrix. The microhardness reduces gradually with the increase in distance from the crate, this is attributed to working hardening and uneven energy distribution caused by high-velocity impact.