Fatigue and fracture of nanostructured metals and alloys

Lü, Lei; Pan, Qingsong; Hattar, Khalid Mikhiel; Boyce, Brad Lee

doi:10.1557/s43577-021-00054-y

Cited by 26 publications

(8 citation statements)

References 76 publications

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“…This change in the deformation mechanism provides superior mechanical properties to NC materials [19]. Due to these nano-scale features, the NC materials have enhanced strength [20][21][22], improved fatigue life [23][24][25], superior wear resistance [26,27], improved hardness [20,28,29], higher specific heat [30,31], and improved coefficient of thermal expansion [32][33][34]. However, researchers also revealed that NC materials have lower ductility [35].…”

Section: Processing Of Nc Materialsmentioning

confidence: 99%

“…A lot of research has been conducted recently to achieve the optimal combination of strength and ductility in the NC materials. Osman et al [23] experimented with cryomilled and quasi-isostatically forged pure titanium metal and studied their tensile me- chanical properties. They obtained high yield strength and UTS of 840 MPa and 902 MPa, respectively, with a high ductility of around 27.5%.…”

Section: Mechanical Properties Of Nc Materialsmentioning

confidence: 99%

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Nanocrystalline Materials: Synthesis, Characterization, Properties, and Applications

et al. 2021

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Nanostructuring is a commonly employed method of obtaining superior mechanical properties in metals and alloys. Compared to conventional polycrystalline counterparts, nanostructuring can provide remarkable improvements in yield strength, toughness, fatigue life, corrosion resistance, and hardness, which is attributed to the nano grain size. In this review paper, the current state-of-the-art of synthesis methods of nanocrystalline (NC) materials such as rapid solidification, chemical precipitation, chemical vapor deposition, and mechanical alloying, including high-energy ball milling (HEBM) and cryomilling was elucidated. More specifically, the effect of various process parameters on mechanical properties and microstructural features were explained for a broad range of engineering materials. This study also explains the mechanism of grain strengthening using the Hall-Petch relation and illustrates the effects of post-processing on the grain size and subsequently their properties. This review also reports the applications, challenges, and future scope for the NC materials.

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Section: Processing Of Nc Materialsmentioning

confidence: 99%

Section: Mechanical Properties Of Nc Materialsmentioning

confidence: 99%

Nanocrystalline Materials: Synthesis, Characterization, Properties, and Applications

et al. 2021

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“…As a result of this, NC materials offer superior mechanical properties and are considered as a potential candidate for applications that demand improved properties compared to polycrystalline materials with coarser grain structures [ 10 ]. Scholars have reported high hardness [ 11 , 12 ], enhancement in strength [ 13 , 14 ], superior wear resistance [ 15 , 16 ], improved fatigue life [ 17 , 18 ], high thermal expansion coefficient [ 19 , 20 ], and high corrosion resistance [ 21 , 22 ] for NC materials. NC materials are also reported to have seven times higher hardness and ten times higher yield strength as compared to their polycrystalline coarse grain counterparts [ 23 , 24 ].…”

Section: Introductionmentioning

confidence: 99%

Influence of Cryomilling on Crystallite Size of Aluminum Powder and Spark Plasma Sintered Component

et al. 2022

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The present investigation aims to develop nanocrystalline (NC) pure aluminum powders using cryomilling technique and manufacture bulk components using spark plasma sintering (SPS). The cryomilling was performed on pure Al powders for 2, 6, and 8 h. The cryomilled powders were then consolidated using SPS to produce bulk components. The particle morphology and crystallite size of the powders and the bulk SPS components were analyzed using scanning electron microscopy (SEM), X-ray diffraction (XRD), and transmission electron microscopy (TEM). The results showed that the crystallite size of pure Al powders decreases with increased cryomilling time. The results also showed that the SPS at elevated temperatures resulted in a slight increase in crystallite size, however, the changes were insignificant. The mechanical properties of the bulk components were determined using a Vickers microhardness tester. The hardness of the cryomilled SPS component was determined to be three times higher than that of the unmilled SPS component. The mechanism for the reduction in crystallite size with increasing cryomilling time is discussed. This fundamental study provides an insight into the development of bulk nanomaterials with superior mechanical properties for automotive, aerospace, marine, and nuclear applications.

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“…Such superior ductility primarily originates from the progressive plastic yielding from the core to surface of the gradient nanostructures, which induces the activation of 2 of 9 novel deformation mechanisms [1]. For instance, a mechanically driven GB migration process with grain coarsening in either homogeneous or abnormal mode dominates the plastic deformation of the gradient NG Cu under tension and cyclic deformation [8,[13][14][15]. Nevertheless, as for conventional nanosized grains with high-density GBs, structural coarsening inevitably results in the mechanical softening under external mechanical stimuli, which is detrimental to the continuous property increment and technological applications [1,8,16].…”

Section: Introductionmentioning

confidence: 99%

Superior Strength and Ductility of 304 Austenitic Stainless Steel with Gradient Dislocations

et al. 2021

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Materials with designed gradient nanograins exhibit unprecedented mechanical properties, such as superior strength and ductility. In this study, a heterostructured 304 stainless steel with solely gradient dislocation structure (GDS) in micron-sized grains produced by cyclic-torsion processing was demonstrated to exhibit a substantially improved yield strength with slightly reduced uniform elongation, compared with its coarse grained counterparts. Microstructural observations reveal that multiple deformation mechanisms, associated with the formation of dense dislocation patterns, deformation twins and martensitic phase, are activated upon straining and contribute to the delocalized plastic deformation and the superior mechanical performance of the GDS 304 stainless steel.

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Fatigue and fracture of nanostructured metals and alloys

Cited by 26 publications

References 76 publications

Nanocrystalline Materials: Synthesis, Characterization, Properties, and Applications

Nanocrystalline Materials: Synthesis, Characterization, Properties, and Applications

Influence of Cryomilling on Crystallite Size of Aluminum Powder and Spark Plasma Sintered Component

Superior Strength and Ductility of 304 Austenitic Stainless Steel with Gradient Dislocations

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