000015326 001__ 15326
000015326 005__ 20161115100218.0
000015326 04107 $$aeng
000015326 046__ $$k2016-08-21
000015326 100__ $$aSun, Qingping
000015326 24500 $$aEnhance fatigue resistance of NiTi by grain size gradient (INVITED)

000015326 24630 $$n24.$$p24th International Congress of Theoretical and Applied Mechanics - Book of Papers
000015326 260__ $$bInternational Union of Theoretical and Applied Mechanics, 2016
000015326 506__ $$arestricted
000015326 520__ $$2eng$$aRecent research shows that NiTi with GS=10nm can significantly suppress the crack nucleation and enhance the fatigue life but at the expenses of reduced ductility and crack growth resistance. In this paper, surface mechanical attrition treatment (SMAT) is used to create a nanocrystallined Grain-Size-Gradient (GSG) surface layer with smooth GS distribution to enhance fatigue life of NiTi. The key idea is to suppress the surface crack nucleation and growth by the Hall-Petch strengthening and the high residual compressive stress, both due to the severe plastic deformation of the GSG layer. Fatigue experiment under cyclic tension is performed and the intrinsic and extrinsic fatigue and toughening mechanisms and their GSG dependence is discussed. The importance of hybridizing the size dependent material properties and developing the next generation fatigue resistant NiTi alloy by grain size engineering is demonstrated.

000015326 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000015326 653__ $$a

000015326 7112_ $$a24th International Congress of Theoretical and Applied Mechanics$$cMontreal (CA)$$d2016-08-21 / 2016-08-26$$gICTAM2016
000015326 720__ $$aSun, Qingping
000015326 8560_ $$ffischerc@itam.cas.cz
000015326 8564_ $$s188488$$uhttps://invenio.itam.cas.cz/record/15326/files/TS.SM09-4.01.pdf$$yOriginal version of the author's contribution as presented on CD,  page 2422, code TS.SM09-4.01
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000015326 962__ $$r13812
000015326 980__ $$aPAPER