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Enhancing Mechanical Properties of TiZrAlV by Engineering a Multi‐Modal‐Laminated Structure
Author(s) -
Shi Yindong,
Wang Lina,
Li Ming,
Zhang Guosheng,
Guo Defeng,
Zhang Xiangyi
Publication year - 2016
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201500194
Subject(s) - materials science , microstructure , ultimate tensile strength , annealing (glass) , ductility (earth science) , alloy , grain size , elongation , composite material , metastability , metallurgy , creep , physics , quantum mechanics
In the present study, microstructure and mechanical properties of a new β‐metastable TiZrAlV prepared via thermomechanical processing (TMP) treatments have been studied. An excellent combination of ultimate tensile strength (σ b ≈ 1 630 MPa) and ductility (ϵ f ≈ 6.6%) has been achieved in the alloy after cold rolling, thermal annealing (665 °C/1 h), and two‐step aging (650 °C/0.5 h + 450 °C/2 h). This is attributed to the formation of a refined β microstructure with grain size of ≈10 µm and a multi‐modal‐laminated structure that consists of large primary ap grains (2 µm, 9.5 vol%) and coarse α precipitates (300 nm, 21 vol%) and fine α platelets (50 nm, 65 vol%). The fine α platelets contribute to high strength while the large primary α p grains and the refined β grain size provide ductility.