Effect of solution treatment and aging on microstructure and tensile properties of high strength β titanium alloy, Ti–5Al–5V–5Mo–3Cr

• Published in: Materials in engineering Vol. 66; pp. 596 - 610
• Main Authors: Shekhar, Shashi, Sarkar, Rajdeep, Kar, Sujoy Kumar, Bhattacharjee, Amit
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 05.02.2015
• Subjects: Aging aircraft; High strength; Mathematical models; Microstructure; Solution heat treatment; Tensile properties; Titanium; Titanium base alloys
• ISSN: 0261-3069
• DOI: 10.1016/j.matdes.2014.04.015

•Alloy was double melted in vacuum arc and then it was thermo-mechanically processed.•Microstructure was determined as a function of solution treatment and aging (STA).•Tensile properties were determined as function of β and α+β STA.•β STA resulted in higher strength in compared to α+β STA.•α+β STA resulted in optimum condition strength and ductility. Ti–5Al–5V–5Mo–3Cr is one of the latest high strength β titanium alloys to be used for larger size components in aircraft structures replacing Ti–10V–2Fe–3Al. In the present study, a double VAR melted ingot was thermo-mechanically processed and it’s microstructure and tensile properties determined as a function of β as well as α+β solution treatment and aging. The β solution treatment and aging resulted in higher strength and α+β solution treatment and aging resulted in an optimum combination of strength and ductility. Its aging behavior was studied as a function of time and temperature and corresponding microstructure as well as fractographs of tensile tested specimens were recorded. This systematic study should help in further modeling its mechanical behavior.