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In-situ SEM observation to deformation and fracture behavior of Ti-55531 alloy
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1.College of Materials and Metallurgy,Guizhou University;2.Northwest Institute for Nonferrous Metal Research,Xi’an

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    Abstract:

    Deformation and fracture behavior of Ti-55531 alloy with lamellar microstructure (LM) and bimodal microstructure (BM) under static loading were analyzed by the in-situ SEM tensile method. The results show that the characteristic parameters of the alpha phase have a strong influence on the deformation, crack initiation and propagation behavior of the alloy under static loading. Dislocation initiated at secondary alpha (αs) interior under pressure, because the thick αs plate is softer than residual beta (βr) lath in LM. Dislocation moves and accumulates at the αsr interphase during deformation, which induces that cracks initiate at and propagate along the αsr interphase during the process of fracture. However, beta transaction microstructure (βtrans) is greatly harder than equiaxed primary α (αp) in BM, moreover, αpwith large size could support longer slip length. Both of above reasons leads to a large number of multi-direction slips initiate at αp during deformation of BM. The intersection of slip lines in different directions promotes stress concentration at αpinner, and some dislocations accumulate at the αptrans interface to produce stress concentration. These behavior results in the initiation of microcracks within αp and the αptrans interface, and propagation along the weak interface of αptrans, or the aggregation site of αp.

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[Huang Chaowen, Tan Chansheng, Xin Shewei, Zhao Yongqing, Wan Mingpan. In-situ SEM observation to deformation and fracture behavior of Ti-55531 alloy[J]. Rare Metal Materials and Engineering,2020,49(1):331~336.]
DOI:10.12442/j. issn.1002-185X.20181262

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History
  • Received:December 18,2018
  • Revised:January 20,2019
  • Adopted:January 21,2019
  • Online: February 16,2020
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