NDLI: The Impact of Strain Reversal on Microstructure Evolution and Orientation Relationships in Ti-6Al-4V with an Initial Alpha Colony Microstructure

Content Provider	Springer Nature Link
Author	Muszka, K. Lopez Pedrosa, M. Raszka, K. Thomas, M. Rainforth, W. M. Wynne, B. P.
Copyright Year	2014
Abstract	The effect of forward and reverse torsion on flow behavior and microstructure evolution, particularly dynamic and static spheroidization, on Ti-6Al-4V with an alpha lamella colony microstructure was studied. Testing was undertaken sub beta transus [1088 K (815 °C)] at strain rates of either 0.05 or 0.5 s$^{−1}$. Quantitative metallography and electron back scatter diffraction has identified that a critical monotonic strain (ε $_{c}$) in the range of 0.3 to 0.6 is required to initiate rapid dynamic spheroidization of the alpha lamella. For material deformed to strains below ε $_{c}$ and then reversed to a zero net strain the orientation relationships between alpha colonies are close to ideal Burgers, enabling prior beta grains to be fully reconstructed. Material deformed to strains greater than ε $_{c}$ and reversed lose Burgers and no beta reconstruction is possible, suggesting ε $_{c}$ is the strain required to generate break-up of lamella. Static spheroidization is, however, sensitive to strain path around ε $_{c}$. Annealing at 1088 K (815 °C) for 4 hours for material subjected to 0.25 forward + 0.25 forward strain produces 48 pct spheroidized grains while material with 0.25 forward + 0.25 reverse strain has 10 pct spheroidization. This is believed to be a direct consequence of different levels of the stored energy between these two strain paths.
Starting Page	5997
Ending Page	6007
Page Count	11
File Format	PDF
ISSN	10735623
Journal	Metallurgical and Materials Transactions A
Volume Number	45
Issue Number	13
e-ISSN	15431940
Language	English
Publisher	Springer US
Publisher Date	2014-09-30
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Metallic Materials Characterization and Evaluation of Materials Structural Materials Surfaces and Interfaces, Thin Films Nanotechnology
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Metals and Alloys Condensed Matter Physics

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