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Microstructure and mechanical properties of a new high-strength and high-toughness titanium alloy

Rare Metals 2023年第1期42卷 281-287页

作者： Dong Li Song-Xiao Hui Wen-Jun Ye Cheng-Lin Li State Key Laboratory for Nonferrous Metals and Processes General Research Institute for Nonferrous MetalsBeijing100088China

In order to develop a new titanium alloy with a good combination of strength-ductility-toughness,a nearbeta titanium alloy was designed based on the already widely used Ti-1023 *** avoid beta fleck occurring in the microstructure,the new Ti-Al-Fe-V(Cr,Zr) alloy has been made through decreasing the content of Fe,based on molybdenum equivalency and Bo-Md molecular orbital method(a method for new alloy designing based on the molecular orbital calculating).After primary design computation,Ti-Al-Fe-V(Cr,Zr) alloy was optimized as Ti-3Al-4.5Cr-1Fe-4V-1Zr *** microstructure and tensile properties of this alloy subjected to several commonly used heat treatments were *** results show that the tensile strength of the alloy after solution treated below the β-transus temperature comes between 850 and 1100 MPa,with elongation in the range of 12.5 %-17.0 %.In solution-treated and solution-aged samples,a low-temperature aging at 500 ℃ results in the precipitation of finer α *** the increase in aging temperature,the secondary α phase becomes coarser and decreases in ***,it will lead to the increase in tensile ductility,but reduction in ***,after modulated aging treatment,the alloy can obtain highstrength level with acceptable *** tensile strength of the alloy can achieve 1273 MPa,with an elongation of 11.0 %.At the same time,the fracture toughness(K_(IC)) of the alloy achieves 83.8 MPa·m^(1/2).It is obvious that the newly designed alloy has achieved a good blend of strength-ductility-toughness.

关键词： Beta titanium alloy Microstructure tensile/toughness property

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