Effects of Solution Treatment on the Microstructure and Mechanical Properties of Ti–22Al–25Nb Alloys1 . Issue 7 (30th March 2017)

• Record Type: Journal Article
• Authors: Wu, Yang; Kou, Hongchao; Tang, Bin; Liu, Degui; Li, Jizhen; Li, Jinshan
• Is Part Of: Advanced engineering materials. Volume 19:Issue 7(2017)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2017-03-30
• Subjects: Materials -- Periodicals; 620.11
• DOI: 10.1002/adem.201700081
• Languages: English
• ISSNs: 1438-1656

Abstract

Abstract : The effects of solution treatment on the microstructure and mechanical properties of Ti‐22Al‐25Nb alloy are investigated. Numerous equiaxed α 2 particles distribute in a B2 matrix after solution treatment in the α 2 + B2 region. The growth rate of the B2 grain increases with solution temperature and decreases with increasing holding time. When the solution temperature is lower than B2‐transus, it is seen that both the strength and ductility decrease with increasing solution temperature and holding time. After being solution‐treated at a super‐transus temperature, the alloy with a fully B2 microstructure shows an ultralow elongation (∼5%) and a typical brittle fracture characteristic. Abstract : For Ti–22Al–25Nb alloy, α 2 phase dissolves gradually and the average grain size of B2 phase increases with increasing solution temperature and time. The pinning of some α 2 particles at the B2 grain boundaries results in abnormal grain growth (AGG). Furthermore, various microstructure characteristics have significant influence on room temperature tensile properties.