Enhancing fine-scale a phase precipitation and mechanical behavior by addition of Cu to metastable β Ti-5553 alloy

Author(s)

Starck, Leticia F. ; Sangali, Marcio ; de Melo, Maria F. C. ; Opini, Victor C. ; Lopes, Eder S. N. ; Caram, Rubens

• Document type: Journal article
• Source: Materials Letters; v. 351, p. 5-pg., 2023-11-15.

Abstract

Metastable beta Ti alloys in the beta quenched condition exhibit relatively low mechanical strength. Aging heat treatment can improve mechanical strength because of controlled alpha phase precipitation into the beta matrix. This study aimed to examine the aging response of a beta quenched Cu-modified Ti-5553 alloy, alpha phase precipitation therein, and the resulting mechanical behavior. It was found that Cu addition resulted in the precipitation of a nanometric Ti2Cu intermetallic compound, which upon aging, affected a phase precipitation and therefore increased the ultimate tensile strength from 1147 to 1222 MPa at the expense of ductility. (AU)

• FAPESP's process: 18/18293-8 - Titanium alloys: phase transformations and additive manufacturing applied to obtaining functionally graded materials
• Grantee: Rubens Caram Junior
• Support Opportunities: Research Projects - Thematic Grants