Structure-Property Relations in a Metastable Beta Ti Alloy Containing Si.
Abstract
The hardness response, tensile behavior, and phase transformations occurring in a quenched and aged metastable Beta-phase Ti-30 a/o V - 1 a/o Si alloy was investigated. Upon aging at 570C, as-quenched samples show a broad hardness peak which is associated with the formation of rod-like, hexagonal (Ti, V)xSiy transition phase precipitates. Faceted, tetragonal (Ti,V)3Si particles are also observed upon aging at 570C and are concluded to be the equilibrium silicide. The presence of the (Ti,V)3Si phase on the grain boundaries results in a loss of tensile ductility and a transition to intergranular fracture after extended aging at 570C. Comparing the behavior of Ti-30V to that of Ti-30V-1Si shows that the presence of Si strongly retards non-Burgers alpha-phase formation. However, a substantial age hardening response still occurs upon aging at 450C, especially after prior cold work (the yield strength increases from 635 MPa to 982 MPa). This hardening increment is combined with a retention of a ductile, transgranular fracture even after extended aging at 450C.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1976
- Accession Number
- ADA027031
Entities
People
- D. E. Graham
- Donald A. Koss
Organizations
- Michigan Technological University