Microstructural and hardness gradients in Cu processed by high pressure surface rolling

He, Qiongyao; Zhu, Xiaoyan; Mei, Q.S.; Hong, Chuanshi; Wu, Guilin; Huang, Xiaoxu

doi:10.1088/1757-899x/219/1/012025

Cited by 2 publications

(1 citation statement)

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“…Dislocation activity can generate dislocation cells, walls, or tangles through slip to subdivide grains [ 27 , 28 , 29 , 30 ]. The dislocation–twin interaction and twin–twin interaction are the main routes to achieve grain refinement in moderate- and low-SFE metals [ 19 , 31 , 32 , 33 ].…”

Section: Introductionmentioning

confidence: 99%

The Microstructure Evolution and Formation Mechanism of Gradient Nanostructure Prepared on CrCoNi Medium-Entropy Alloy

Dou

et al. 2023

Nanomaterials

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An equiatomic CrCoNi medium-entropy alloy was subjected to high-energy shot peening (HESP) to fabricate a gradient nanostructure (GNS) in this work. The microstructures of the GNS samples at different depths within the deformed layer were thoroughly investigated. The microstructure exhibited a transformation from unstressed coarse grains to deformed coarse grains, followed by the formation of ultrafine grains, and ultimately reaching a final nanocrystalline structure with a uniform size of approximately 50 nm. Detailed structural analysis indicated that the deformation process was primarily influenced by the interaction between dislocations and deformation twins, which was attributed to the low stacking fault energy (SFE) of the alloy. The nanocrystalline mechanism was divided into three stages. In the coarse-grained deformation stage, the dislocation band divided twin/matrix lamellae into sub-segments, and the cross twin divided coarse grains into ultrafine grains simultaneously. In the ultrafine grain deformation stage, dislocations were arranged around the deformation twins in order to break the twins to form incoherent boundaries, destroying the coherent relationship between the twin and matrix. Finally, in the nanocrystalline deformation stage, the nanocrystalline structure was further divided into smaller segments to accommodate additional strains through the interaction between dislocations and twins.

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