Mechanical behavior of Ti–6Al–4V at high and moderate temperatures—Part I: Experimental results

• Published in: Materials science & engineering. A, Structural materials : properties, microstructure and processing Vol. 326; no. 2; pp. 297 - 305
• Main Authors: Majorell, A, Srivatsa, S, Picu, R.C
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 31-03-2002; Elsevier
• Subjects: Applied sciences; Elasticity. Plasticity; Exact sciences and technology; Forging; Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology; Metals. Metallurgy; Plastic deformation; Rate sensitivity; Temperature sensitivity; Titanium alloys; Titanium alloys; Forging; Rate sensitivity; Temperature sensitivity; Plastic deformation; Constitutive equation; Strain rate sensitivity; Plastic flow; Temperature effect; Alloy-Ti90Al6V4; Experimental study; Compression test; Titanium base alloys; Transition metal alloy; Plasticity; Microstructure; Flow stress; Strain rate
• ISSN: 0921-5093; 1873-4936
• DOI: 10.1016/S0921-5093(01)01507-6

This study investigates the plastic deformation of titanium alloy Ti–6%Al–4%V under low and moderate strain rates and various temperature conditions. Mechanical testing is performed in the temperature range 650–1340 K (710–1950
°F) and under constant strain rate loading ranging from 10
−3 to 10 s
−1. The test results are correlated with the evolution of the microstructure and compared to published data. The flow stress of this alloy is strongly dependent on both temperature and deformation rate, with the temperature effect becoming negligible in the upper part of the temperature range investigated. At temperatures above 800 K (980
°F) the flow stress decreases sharply with temperature. The effect of deformation rate on this transition is investigated and the possible mechanisms responsible for the behavior are discussed. Based on these experimental results, a physically-based constitutive law is developed in the sequel of this paper.