Characterization and properties of nanocrystalline surface layer in Mg alloy induced by surface mechanical attrition treatment

Wei, Yinghui; Liu, Baosheng; Hou, Lifeng; Xu, Bingshe; Liu, Gang

doi:10.1016/j.jallcom.2006.11.079

Cited by 100 publications

(41 citation statements)

References 31 publications

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“…The alloy plate was cut into pieces with dimension of 100 mm × 100 mm × 5 mm suitable for HESP processing [12]. During HESP process, hardened stainless steel balls of 6 mm in diameter were placed at the bottom of a vacuum chamber which was attached to a vibration generator.…”

Section: Methodsmentioning

confidence: 99%

Nanocrystalline structure of magnesium alloys subjected to high energy shot peening

Hou

Wei

Shu

et al. 2010

Journal of Alloys and Compounds

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Section: Methodsmentioning

confidence: 99%

Nanocrystalline structure of magnesium alloys subjected to high energy shot peening

Hou

Wei

Shu

et al. 2010

Journal of Alloys and Compounds

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“…However, it was reported in the Ref. [8] that no twinning was found at initial stage of plastic deformation. It still needs more research efforts to understand the mechanism and spe- cific processes of forming nanocrystalline in magnesium alloys.…”

Section: Microstructure Observationmentioning

confidence: 88%

“…And the original coarse grains were divided gradually by dislocation walls (DWs) and dislocation tangles (DTs), etc [7,8] . The specific process of forming nanocrystalline varied from different kinds of materials.…”

Section: Microstructure Observationmentioning

confidence: 99%

Surface nanocrystallization of magnesium alloy AZ91D by high-energy shot peening

Zhang

Yang

et al. 2009

J. Wuhan Univ. Technol.-Mat. Sci. Edit.

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High-energy shot peening (HESP), a method to produce severe plastic deformation by high velocity flying balls, was applied on die cast magnesium alloy AZ91D. Effects of surface nanocrystallization by HESP and heat treatment at different temperatures were investigated. The microstructure evolution was conducted using X-ray diffraction (XRD) and field emission scanning electronic microscopy (FESEM). The hardness was measured by microhardness tester. The experimental results show that surface nanocrystrallization of AZ91D obtained by HESP would lead to the increase of microhardness. Low temperature heated at 100 ℃ for 1 h do not change the property obviously. However, both the microstructure and microhardness vary greatly after heat treatment at 400 ℃ for 1 h.

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“…Surface mechanical attrition treatment (SMAT) is a new and potentially effective method to produce nanostructured surface layers in bulk materials. Investigations indicate that the grain refinement via SMAT process can cause the formation of twins in the materials with low-stacking fault energy, for example, in 304 stainless steel [13][14][15][16][17][18][19][20]. So, in this paper an attempt was made to evaluate the effect of nano grains and twins formation in the 304 stainless steel (by using SMAT) on the prevention of weld-decay.…”

Section: Introductionmentioning

confidence: 99%

Prevention of weld-decay in austenitic stainless steel by using surface mechanical attrition treatment

2012

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Surface mechanical attrition treatment (SMAT) was applied to the samples of a type AISI 304 stainless steel in order to induce grain refinement as well as formation of twins. Transmission electron microscopy and X-ray diffraction analysis results showed that the average grain size at the surface of the SMATed sample was about 10 nm. The untreated and SMATed samples were then welded using a one-pass gas tungsten arc procedure. The heat-affected zone (HAZ) of the samples was examined by optical microscopy and corrosion tests. Results of the double loop electrochemical potentiokinetic reactivation tests showed that the degree of sensitization in the HAZ for the SMATed sample was very low as compared to that of the untreated one. The pre-SMATed sample was resistant to intergranular corrosion. This is mainly due to the formation of high density of twins which are not prone to carbide precipitation because of their regular and coherent atomic structure and extreme low grain boundary energy as compared with those of other grain boundaries.

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Characterization and properties of nanocrystalline surface layer in Mg alloy induced by surface mechanical attrition treatment

Cited by 100 publications

References 31 publications

Nanocrystalline structure of magnesium alloys subjected to high energy shot peening

Nanocrystalline structure of magnesium alloys subjected to high energy shot peening

Surface nanocrystallization of magnesium alloy AZ91D by high-energy shot peening

Prevention of weld-decay in austenitic stainless steel by using surface mechanical attrition treatment

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