Spall strength and fracture behavior of Ti–10V–2Fe–3Al alloy during one-dimensional shock loading. (January 2018)

• Record Type: Journal Article
• Authors: Ren, Yu; Xue, Zhiyong; Yu, Xiaodong; Tan, Chengwen; Wang, Fuchi; Cai, Hongnian
• Is Part Of: International journal of impact engineering. Volume 111(2018)
• Page Start: 77
• Page End: 84
• Publication Date: 2018-01
• Subjects: Metastable β-titanium alloy -- Shock-induced martensite phase transformation -- Spall fracture -- Spall strength -- Nucleation and propagation of micro-damage; Impact -- Periodicals; Shock (Mechanics) -- Periodicals; Impact -- Périodiques; Choc (Mécanique) -- Périodiques; Impact; Shock (Mechanics); Periodicals; 620.1125
• DOI: 10.1016/j.ijimpeng.2017.09.005
• Languages: English
• ISSNs: 0734-743X

Abstract

Highlights: The SIM transition has a harmful effect on the spallation resistance of Ti-alloy. Ti–10V–2Fe–3Al (Ti–1023) is likely to spall in a mixed fracture manner. The spall strength of Ti–1023 drops by ∼20% as the shock stress exceeds 9 GPa. SIM phase promotes the nucleation and propagation of micro-damages in Ti–1023. Abstract: The spall fracture behavior of a typical metastable β titanium alloy, Ti–10V–2Fe–3Al, is systemically investigated during one-dimensional shock loading. Shock pressures over 14 GPa are achieved through a series of plate impact experiments. The results show that the shock-induced β-to-α″ martensite (SIM) phase transformation strongly influences the spall fracture behavior of this alloy. The spall strength of Ti–10V–2Fe–3Al ranges from 2.5 to 3.1 GPa, and drops by nearly 20% as the shock pressure exceeds 9 GPa. The acicular SIM phases provide additional nucleation sites and propagation paths for micro-damage, leading to the reduction of spall strength of Ti–10V–2Fe–3Al. Microstructural analyses also suggest that Ti–10V–2Fe–3Al is likely to spall in a mixed fracture manner containing both brittle and ductile failure features. The spall fracture surface of this alloy is very rough and consists of facets covered by ductile dimples.