Study of deformation mechanisms in a metastable β Zr alloy during compression

• Published in: Materials letters 2019-02, Vol.237, p.172-175
• Main Authors: Liao, Zhongni, Luan, Baifeng, Zhang, Xinyu, Xing, Qingfeng, Liu, Riping, Murty, K.L., Liu, Qing
• Format: Article
• Language: English
• Subjects: Alloy development; Alloys; Deformation mechanisms; Deformation-induced martensitic transformation; Martensite; Martensitic transformations; Materials science; Metastable β-Zr alloy; Plastic deformation; Plastic properties; Strain analysis; Titanium base alloys; Twinning; Zirconium base alloys
• ISSN: 0167-577X; 1873-4979
• DOI: 10.1016/j.matlet.2018.11.043

•Deformation-induced α′ and α″ martensitic transformation and 101¯2 twinning coexist.•The 101¯2 twinning is a kind of secondary order deformation product.•Have a potentially combination of both TRIP and TWIP effects. The deformation mechanisms in a metastable β-48.1Zr-43.2Ti-4.5Al-4.2V (wt%) alloy after room-temperature compression to ∼6% strain were investigated. The results indicated that the alloy deforms primarily by deformation-induced β → α′ martensitic transformation and 101¯2 twinning, and limited deformation-induced β → α″ martensitic transformation. The 101¯2 twinning was formed within the α′ plate to accommodate the local plastic deformation strain generated in α′ martensite plate during compression. Such a combination of deformation mechanisms were observed in metastable β Zr or Ti alloys for the first time, which can aid future development of superior β Zr alloys displaying a potentially combination of transformation-induced plasticity (TRIP) and transformation twinning-induced plasticity (TWIP) effects.