Progress in Fatigue Properties of Gradient Nanostructured Materials
FU Lei1,2, LIN Li3, LUO Yunrong2, XIE Wenling2, WANG Qingyuan1, LI Hui2
1 School of Aeronautics and Astronautics, Sichuan University, Chengdu 610065, China; 2 School of Mechanical Engineering, Sichuan University of Science & Engineering, Zigong 643000, China; 3 School of Materials Science and Engineering, Sichuan University of Science & Engineering, Zigong 643000, China;
Abstract: The bulk nano/ultrafine grained (NG/UFG) metals were prepared by means of severe plastic deformation (SPD) or electrodeposition, which display many attractive physicochemical and mechanical properties, but the toughness and strain localization resistance of bulk NG/UFG metals significantly decrease, and the work-hardening ability disappears. Therefore, The high cycle fatigue lifetime (HCF) of bulk NG/UFG me-tals under stress-controlled cyclic loading was increased by suppressing fatigue crack initiation on account of its high strength, while the low cycle fatigue lifetime (LCF) under strain-controlled cyclic loading usually decreases due to lack of ductility. In practice, the fatigue failure of engineering structures mostly originates from the surface of materials, the fatigue cracks usually initiation from material surfaces and propagate into interior during cyclic loading. Therefore, the optimization of the microstructure and properties of material surface was beneficial to improving its service life. For this purpose, these novel surface modification approachs were developed to synthesize a gradient nanostructured (GNS) materials in recent years, referred to as surface self-nanocrystallization (SNC). With these SNC techniques, a thicker nanostructured layer with higher surface hardness, a large residual compressive stress and much smaller surface roughness can be achieved on the metallic surface.The surface of GNS materials was composed of nanograins, while the core remains coarse-grained structures, from the surface to the interior, the grain sizes gradually range from nanometer scale to micrometer scales, the special construction shape of GNS mate-rials was able to effectively enhance its fatigue resistance performance in both high-cycle and low-cycle regimes. At present, the research on the mechanical properties, especially the fatigue properties, of gradient nanostructured materials has become research hot spot in this field, many engineering applications benefit from the research results in this field, however, at present, the research results on the field are defective summarized. Therefore, in this paper, the research progresses on the fatigue properties of gradient nanostructured materials in recent years is systematic summarized, and many factors that cause fatigue fracture of gradient nanostructured materials were analyzed, and perspectives and challenges on basic scientific understanding of fatigue properties of gradient nanostructured materials are addressed, which provides reference for the engineering application of gradient nanostructured materials in this field.
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2021, Vol. 35 
