Structural development at severely high strain in AZ31 magnesium alloy processed by cold forging and subsequent annealing

Yang, Xuyue; Miura, Hiromi; Sakai, Taku

doi:10.1016/j.matdes.2012.08.025

Cited by 38 publications

(19 citation statements)

References 21 publications

(54 reference statements)

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“…First, grain refinement; this is noteworthy because it is difficult to refine Mg grains to sub-micron level via traditional processing, such as rolling, forging and extrusion. However, ECAP processing has been used to effectively produce homogeneous ultrafine grained (UFG) microstructures in a number of commercial Mg alloys including AZ31, AZ61 and AZ91 [24][25][26]. It is known that the extent of grain refinement increases with the number of ECAP passes.…”

Section: Introductionmentioning

confidence: 99%

Enhanced strength and ductility of AZ80 Mg alloys by spray forming and ECAP

Tang

Zhao

Исламгалиев

et al. 2016

Materials Science and Engineering: A

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The relatively low strength and poor ductility of conventional AZ80 Mg alloys have been attributed to the limited number of independent slip systems, in combination with the formation of fragile eutectic β-Mg17Al12 networks at grain boundaries. In an effort to overcome these limitations, spray forming followed by equal channel angular pressing (ECAP) was employed to obtain a unique bi-modal microstructure: coarse grains were separated and surrounded by deformation networks consisting of ultrafine-grained Mg with an average grain size of 0.6 μm and ellipsoidal shaped β-Mg17Al12 particles with sizes of 200-300 nm. Tensile tests revealed the advantage of this structure: a yield strength of 235 MPa combined with an elongation to failure of 14%; the values are significantly higher than those of their conventional counterparts (100 MPa-12%, and 140 MPa-5%). The underlying strengthening and deformation mechanisms of this particular microstructure are

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Section: Introductionmentioning

confidence: 99%

Enhanced strength and ductility of AZ80 Mg alloys by spray forming and ECAP

Tang

Zhao

Исламгалиев

et al. 2016

Materials Science and Engineering: A

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“…Basically, the intensity decreased with increasing pass number. Yang et al 6) have revealed that the crystal orientation of grains of MDFed AZ31 Mg alloy was . …”

Section: Texturementioning

confidence: 99%

“…Recently, many severe plastic deformation (SPD) methods are proposed to achieve grain re nement 1) . In the multi-directional forging (MDFing) technique, materials are forged with changing forging direction for 90 degrees pass by pass [2][3][4][5][6][7] . Other SPD methods, such as equal channel angular pressing (ECAP) 8) and high pressure torsion (HPT) 9) are also applied to Mg alloys to achieve ultra ne-grained (UFGed) structures.…”

Section: Introductionmentioning

confidence: 99%

Effect of Grain Size on Fatigue Behavior in AZ61 Mg Alloys Fabricated by MDFing

et al. 2016

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Magnesium (Mg) alloy AZ61 was multi-directionally forged (MDFed) under decreasing temperature conditions using a die. The average grain size decreased with increasing MDFing pass number. The initial grains size of 21.6 μm in the as-annealed specimen decreased gradually during MDFing and an average grain size of 0.3 μm could be attained after MDFing for 8 passes. The tensile strength and Vickers hardness were improved with increasing pass number from 1 to 8. Hall-Petch relationship was held for those static mechanical properties. Subsequently, tension-tension axial loading fatigue tests were performed using the as-annealed specimen and MDFed ones to 1, 3, 6 and 8 passes in which cumulative strains were 0.8, 2.4, 4.8 and 6.4 respectively. Fatigue strengths were highly improved by MDFing with increasing pass number of forging from 1 to 3. However, the improvement looked almost saturated over the pass number of 3. The observed breaking-up of the Hall-Petch relationship concerning with fatigue limits was attributed to grain-boundary sliding followed by crack initiation and propagation along grain boundaries.

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“…Due to their light weight, magnesium alloys are attractive as structural components in auto and aerospace industries [1], and Mg-3Al-1Zn (AZ31) has been investigated extensively [2][3][4][5] in view of its commercial popularity. However, its high temperature creep strength is found inadequate for several applications and the methods for improving this are being explored.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Strength and Hot Workability of AZX312 Magnesium Alloy by Disintegrated Melt Deposition (DMD) Processing in Contrast to Permanent Mold Casting

Rao

Suresh

Prasad

et al. 2018

Metals

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AZX312 (AZ31-2Ca) magnesium alloy, with starting conditions of as-cast (AC), casthomogenized (CH), and disintegrated melt deposition (DMD), is examined in terms of its compressive strength and hot working behavior to establish the relative merits and limitations of these processing routes. Processing maps are developed in the temperature range of 300-500 • C and strain rate range of 0.0003-10 s −1 , and mechanisms of hot deformation are established based on microstructures, tensile ductility, and activation parameters. The alloy in AC and CH conditions has a large grain size with intermetallic phases at the grain boundaries and in the matrix. In DMD processed alloy, the grain size is very small and the phases are refined and distributed uniformly. The compressive strength is significantly improved by DMD processing, which is attributed to the grain refinement. The processing maps for AC and CH conditions are similar, exhibiting only a single workability domain, while the DMD processed alloy exhibited three domains that enhanced workability. The additional workability domain at higher strain rates is an advantage in designing forming processes that facilitates faster production, while the fine grain size produced by a finishing operation in the lower temperature domain will improve the mechanical properties of the product.

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Structural development at severely high strain in AZ31 magnesium alloy processed by cold forging and subsequent annealing

Cited by 38 publications

References 21 publications

Enhanced strength and ductility of AZ80 Mg alloys by spray forming and ECAP

Enhanced strength and ductility of AZ80 Mg alloys by spray forming and ECAP

Effect of Grain Size on Fatigue Behavior in AZ61 Mg Alloys Fabricated by MDFing

Enhancement of Strength and Hot Workability of AZX312 Magnesium Alloy by Disintegrated Melt Deposition (DMD) Processing in Contrast to Permanent Mold Casting

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