Journal
MATERIALS RESEARCH LETTERS
Volume 3, Issue 3, Pages 135-141Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/21663831.2015.1029645
Keywords
Nanocrystalline; Stacking Fault Energy; Fatigue Strength; Fatigue Mechanism; Severe Plastic Deformation
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Funding
- National Natural Science Foundation of China [50931005, 51101162, 51331007]
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Increasing the fatigue strengths of high-strength materials, especially their endurance limits is essentially challenging. The fatigue strengths of nanocrystalline (NC) Cu and Cu-Al alloys processed by high-pressure torsion were prominently enhanced with a decrease in stacking fault energy. This remarkable escalation can be attributed not only to their significantly increased tensile strengths in macro-scale, but also to the essentially improved microstructure stability and reduced strain localization within shear bands in microscale. Owing to the limitation of their intrinsic fatigue mechanisms, the fatigue limits of NC Cu and Cu-Al alloys cannot always acquire appreciable improvement with their monotonic strengths.
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