Title
Comparison of fracture toughness in titanium alloys IMI 550 and IMI 551
Author
Wanhill, R.J.H.
Institution
National Aerospace Laboratory NLR
Date
1978-12-01
Abstract
Fracture toughness tests on two high strength titanium alloys, IMI 550 and 551, showed that the higher strength alloy, IMI 551, had a much lower toughness. The alloys were very similar in microstructure and fracture mechanisms. A number of model formulations for predicting fracture toughness were compared with the experimental results. This comparison indicated a number of parameters to be important, namely yield stress, elastic modulus, plane strain fracture strain, strain hardening exponent and microvoid (dimple) diameter. The observed increase in fracture strain, dimple diameter and fracture toughness with decreasing strength can be rationalized by voids occurring earlier during deformation and by voids initiating at many sites inactive in the lower strength material.
Subject
high strength alloys
titanium alloys
fracture strength
yield strength
elastic properties
strain hardening
fatigue tests
modulus of elasticity
voids
micro structures
fractography
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Publisher
Nationaal Lucht- en Ruimtevaartlaboratorium
Access restriction
Campus only
Source
NLR-TR 78143 U
Part of collection
Aerospace Engineering Reports
Document type
report
Rights
(c) 1978 National Aerospace Laboratory NLR