NDLI: Constitutive analysis of compressive deformation behavior of ELI-grade Ti–6Al

Content Provider	Springer Nature Link
Author	Park, Chan Hee Son, Young Il Lee, Chong Soo
Copyright Year	2011
Abstract	In this study, a constitutive analysis of the flow responses of Ti–6Al–4V under various strain rates $$ \dot{\varepsilon } $$ was conducted by separately quantifying the hardening and softening effects of microstructure, interstitial solute and deformation heating on the total stress. For this purpose, a series of compression tests on an extra-low interstitial grade alloy with equiaxed, lamellar, or bimodal microstructures was performed at $$ 10^{ - 3} \le \dot{\varepsilon } \le 10\;{\text{s}}^{ - 1} $$ until the metal fractured, and the results were compared to those of the commercial grade alloy. The thermal stress σ$^{}$ increased with an increasing interstitial solute concentration; the athermal stress increased in the order of equiaxed, lamellar, and bimodal microstructures. Load–unload–reload tests revealed that the flow softening at a relatively high $$ \dot{\varepsilon } $$ was likely caused by deformation heating rather than by microstructure change; thus flow softening was attributed to a decrease in σ$^{}$. Finally, a mechanical threshold stress model was extended to capture those observations; the modified model can provide a reasonable prediction of flow stress in Ti–6Al–4V with different microstructures and interstitial solute concentrations.
Starting Page	3115
Ending Page	3124
Page Count	10
File Format	PDF
ISSN	00222461
Journal	Journal of Materials Science
Volume Number	47
Issue Number	7
e-ISSN	15734803
Language	English
Publisher	Springer US
Publisher Date	2011-12-06
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Polymer Sciences Materials Science Continuum Mechanics and Mechanics of Materials Characterization and Evaluation of Materials Mechanics Crystallography
Content Type	Text
Resource Type	Article
Subject	Ceramics and Composites Mechanics of Materials Mechanical Engineering Polymers and Plastics

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