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吉喆,沈承金,徐杰.组成相中微观应力和应变对钛合金力学性能的贡献[J].稀有金属材料与工程(英文),2019,48(12):3806~3811.[Ji Zhe,Shen Chengjin and Xu Jie.Contribution of microscopic stress and strain in constituent phases to mechanical properties of titanium alloys[J].Rare Metal Materials and Engineering,2019,48(12):3806~3811.]
Contribution of microscopic stress and strain in constituent phases to mechanical properties of titanium alloys
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Received:June 28, 2018  Revised:September 20, 2018
DOI:
Key words: microscopic stress and strain  constituent phases  mechanical properties  titanium alloys  finite element simulation
Foundation item:中央高校基础研究基金 (2015QNA04)
Author NameAffiliation
Ji Zhe,Shen Chengjin and Xu Jie  
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Abstract:
      Analysis the contribution of constituent phases to mechanical properties is critical to design the microstructure of titanium alloys. For this reason, the microscopic stress and strain in soft primary α (α<sub>p</sub>) and hard transformed β matrix (β<sub>t</sub>) are quantitatively analyzed by a microstructure-based finite element model to determine their contributions to the strength and ductility of Ti-6Al-2Zr-1Mo-1V alloy. The results show that microscopic stress in both α<sub>p</sub> and β<sub>t</sub> shows a normal distribution. The peak stress and stress peak height of β<sub>t</sub> are much larger than that of α<sub>p</sub>. While, α<sub>p</sub> has large peak strain and β<sub>t</sub> has large strain peak height. As α<sub>p</sub> volume fraction decreases from 49% to 12%, the contribution of β<sub>t</sub> to ultimate tensile strength (UTS) and failure strain (FS) of the alloy increases from 59% to 91% and from 36% to 75%, respectively. However, as the contribution of β<sub>t</sub> increases, UTS of the alloy increases 17% and FS decreases 21%. This finding quantitatively reveals the contribution of constituent phases to strength and ductility and provides a basis to design the microstructure of titanium alloys.