Effect of gradient microstructures on strengthening and toughening of AZ31

Jamalian, Maryam; Field, David P.

doi:10.1016/j.msea.2019.138615

Cited by 20 publications

(4 citation statements)

References 29 publications

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“…From Fig. 11, it is apparent that when the Young's modulus is low so the maximum microhardness is also low, as in Mg alloys, Cu alloys and Al alloys [25,33,46,47,52,[57][58][59][60][61]. With an increase in the Young's modulus, the maximum microhardness increases and the superalloy has the highest Young's modulus and the maximum microhardness [48,66].…”

Section: Nature Of the Maximum Microhardness Of The Gradient Layermentioning

confidence: 97%

“…and SP [47,57,58], a 7075 aluminum alloy processed by SP and ultrasonic shot peening (USP) [59][60][61], a pure copper processed by SMAT, surface mechanical grinding treatment (SMGT) and 3S [25,46,52], an H62 copper alloy processed by 3S [33], a pure titanium processed by surface rolling treatment (STR) [51], a TC4 titanium alloy processed by laser peening (LP) and SP [62,63], a 304 stainless steel processed by 3S…”

Section: Nature Of the Maximum Microhardness Of The Gradient Layermentioning

confidence: 99%

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The nature of the maximum microhardness and thickness of the gradient layer in surface-strengthened Cu-Al alloys

et al. 2021

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Section: Nature Of the Maximum Microhardness Of The Gradient Layermentioning

confidence: 97%

Section: Nature Of the Maximum Microhardness Of The Gradient Layermentioning

confidence: 99%

The nature of the maximum microhardness and thickness of the gradient layer in surface-strengthened Cu-Al alloys

et al. 2021

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“…[17][18][19][20] Originating from the heterodeformationinduced (HDI) effect between regions with different grain sizes results in extra strengthening of the material. [21,22] The experimental techniques to obtain GNG samples include surface mechanical attrition treatment (SMAT), [23] severe shot peening (SSP), [24] surface mechanical grinding treatment (SMGT), [25,26] electrodeposition, [27] and induction heating, [28] et al However, the grains of the samples obtained by these methods are mostly randomly distributed. It is challenging to obtain an ordered structure with regular grain distribution.…”

Section: Introductionmentioning

confidence: 99%

Grain Distribution for Optimal Strength in Homogeneous and Gradient Nano‐Grained Coppers

Qiang

Long

2023

Adv Eng Mater

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The distribution of grains plays a crucial role in determining the strength of polycrystalline copper when the grain size is constant. Herein, the mechanical properties of homogeneous nano‐grained (HNG) and gradient nano‐grained (GNG) coppers with different grain distributions are examined using molecular dynamics (MD) simulations. The HNG‐ordered structure has all triple junctions (TJs), whereas the random structure contains many quadruple and quintuple junctions. When grain size is below the critical size in the inverse Hall–Petch relationship, the high‐density TJs in the HNG‐ordered structure effectively inhibit grain boundary (GB) softening compared with the random structure, leading to higher strength. However, when grain size is above the critical size, subgrains are produced inside the large grains due to dislocation slip. In addition, disordered atoms in HNG‐random structure are stacked in the quadruple and quintuple junctions, resulting in thicker GBs. This triggers grain boundary migration, and forms more subgrains at GBs. Subsequently, grain boundary sliding and grain rotation of subgrains induce partial recrystallization in the structure. This consecutively triggered deformation mechanism leads to extra strengthening in the random structure. Further research indicates that combining small‐grained ordered and large‐grained random structures can be a new approach to effectively strengthen GNG materials.

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“…The ease of joining E and FS processes offers the possibility of experimenting with them, especially as concerns the parts controlling the flow of the worked material, i.e., the plunger face. The gradient structure is created in various metallic materials to increase their strength [ 9 , 10 , 11 ] or obtain better electrical properties [ 12 ]. In most cases, obtaining this microstructure in a wire requires a multi-stage process based on plastic deformation by twisting [ 12 ] or compression bonding [ 11 ].…”

Section: Introductionmentioning

confidence: 99%

Modification of Mechanical Properties of Aluminum Alloy Rods via Friction-Extrusion Method

2020

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The elaboration of a modified friction-extrusion method aimed at obtaining 2017A aluminum rods of gradient microstructure is described. This was achieved by cutting spiral grooves on the face of the stamp used for alloy extrusion. The experiments were carried out at a constant material feed (~10 mm/min) and a range of tool rotation speeds (80 to 315 rpm). The microstructure observations were carried out using light microscopy (LM) and both scanning and transmission electron microscopy (SEM and TEM). The mechanical properties were assessed through hardness measurements and static tensile tests. The performed investigations show that material simultaneous radial and longitudinal flow, enforced by friction of the rotating tool head and extrusion, results in the formation of two zones of very different microstructures. At the perpendicular section, the outer zone stands out from the core due to circumferential elongation of strings of particles, while in the inner zone the particles are arranged in a more uniform way. Simultaneously, the grain size of the outer zone is refined by two to four times as compared with the inner one. The transfer from the outer zone to the core area is of gradient type. The hardness of the outer zone was found to be ~10% to ~20% higher than that of the core.

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Effect of gradient microstructures on strengthening and toughening of AZ31

Cited by 20 publications

References 29 publications

The nature of the maximum microhardness and thickness of the gradient layer in surface-strengthened Cu-Al alloys

The nature of the maximum microhardness and thickness of the gradient layer in surface-strengthened Cu-Al alloys

Grain Distribution for Optimal Strength in Homogeneous and Gradient Nano‐Grained Coppers

Modification of Mechanical Properties of Aluminum Alloy Rods via Friction-Extrusion Method

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