Microstructural design for achieving high performances in Ti-V-Al lightweight shape memory alloys by optimizing Zr content

Yi, Xiaoyang; Sheng, Lijie; Fu, Guoqiang; Sun, Bin; Huang, Bowen; Sun, Kuishan; Meng, Xianglong; Gao, Zhiyong; Zhang, Shangzhou; Wang, Haizhen

doi:10.1016/j.matchar.2023.113283

Cited by 9 publications

(1 citation statement)

References 42 publications

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“…However, it has been demonstrated by various studies that Zr is an effective alloying element in stabilizing the β phase at room temperature. The addition of Zr resulted in a reduction in martensitic transformation temperatures, which indicates that Zr can be employed as a β-stable element [27,28]. As for the ST specimen, the contents of Mo, Nb, and Zr in β t were significantly higher than those in equiaxed α p , but there was no enrichment in the β t phase, as can be seen from Figure 6a.…”

Section: Microstructures Characteristicsmentioning

confidence: 83%

Revealing the Effect of α’ Decomposition on Microstructure Evolution and Mechanical Properties in Ti80 Alloy

Xiao,

Hu,

et al. 2024

Materials

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Three types of solution treatment and aging were designed to reveal the α’ decomposition and its effect on the mechanical properties of near-α Ti-80 alloy, as follows: solution at 970 °C then quenching (ST), ST + aging at 600 °C for 5 h (STA-1), and ST + aging 600 °C for 24 h (STA-2). The results show that the microstructures of the ST samples were mainly composed of equiaxed αp and acicular α’, with a large number of dislocations confirmed by the KAM results. After subsequent aging for 5 h, α’ decomposed into acicular fine αs and nano-β (intergranular β, intragranular β) in the STA-1 specimen, which obstructed dislocation motion during deformation, resulting in the STA-1 specimen exhibiting the most excellent yield strength (1012 MPa) and maintaining sufficient elongation (8.1%) compared with the ST (898 MPa) and STA-2 (871 MPa) samples. By further extending the aging time to 24 h, the size of acicular αs and nano-β gradually increased while the density of dislocations decreased, which resulted in a decrease in strength and an increase in plasticity. Based on this, a microstructures–properties correlation model was proposed. This study provides a new method for strength–plasticity matching of near-α titanium alloys through α’ decomposition to acicular αs+nano-β.

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Section: Microstructures Characteristicsmentioning

confidence: 83%