Effect of dislocation structure on fracture toughness of strained BCC-metals |
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Authors: | M Danylenko Yu Podrezov S Firstov |
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Affiliation: | Frantsevich Institute for Problems in Materials Science, 3, Krzhizanovsky St., 252142, Kyiv, Ukraine |
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Abstract: | Mechanical properties of materials depend on their structure. Examined are the effects of dislocation structure on fracture toughness and mechanisms of fracture of BCC-metals. Fracture toughness was determined by depending specimens with cracks introduced into the plane perpendicular to the plane of rolling. Fracture toughness increases with decreasing yield stress (for =15–25%). This is due to instability of slightly misoriented cell structure under repeated loading. The peak of fracture toughness at the temperature 77 K was not observed. The increase of fracture toughness for high strained metals (>60% for Mo, and >85% for Cr) corresponds to cell size reduction and the change of fracture mechanisms. |
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