Forming limit of magnesium alloy at elevated temperatures for precision forging

Ogawa, Narihito; Shiomi, Masanori; Osakada, Kozo

doi:10.1016/s0890-6955(01)00149-3

Cited by 154 publications

(88 citation statements)

References 7 publications

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“…21) Among them, the technique combining forging with annealing has a number of advantages especially in workability and strengthening of Mg alloy. For this reason, much effort has been put on this technique, 22,23) in particular, the hot forging with temperature up to 573 K. 24) However, little is known about the formability of Mg alloy below 573 K, namely, under cold-forging condition. A detailed understanding of the cold forging technique requires a comprehensive examination of microstructure and its impact on property, and this has so far been lacking.…”

Section: Introductionmentioning

confidence: 99%

Effect of Cold Forging and Static Recrystallization on Microstructure and Mechanical Property of Magnesium Alloy AZ31

Liu

Yuan

et al. 2010

Mater. Trans.

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We perform a cold forging and annealing technique on Mg alloy AZ31 and investigate the impact on microstructure evolution and mechanical property. In particular, we focus on how twin and static recrystallization behave during the forging process followed by the annealing. Interestingly, we find that a large number of thick-lenticular {10 1 12} twins emerge at initial stage of deformation and subsequently evolve into narrow-band {10 1 11} and {30 3 32} twins. The transformable twins are found to be crucial for inducing static recrystallization via providing recrystallization sites and refined grains. Moreover, the alloy forged at room temperature and annealed at 623 K is found to have optimal microstructure due to the complete recrystallization and therefore exhibit the highest micro-hardness, largest compressive strength, and most significantly enhanced compressive ratio. The improved mechanical properties are comparable or even superior to those of the alloy deformed using other techniques, rendering the cold forging a promising way for further tailing properties of Mg alloy.

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Section: Introductionmentioning

confidence: 99%

Effect of Cold Forging and Static Recrystallization on Microstructure and Mechanical Property of Magnesium Alloy AZ31

Liu

Yuan

et al. 2010

Mater. Trans.

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“…The billets were gradually heated to the temperature of 250 °C, and then transferred to a hydraulic press whose dies were also pre-heated to the same temperature. This was the lowest forging temperature for a crack-free sample [20]. The billet was forged into an I-beam shape [10] which allowed material flow in different directions at varying strain-rates.…”

Section: Materials and Experimentsmentioning

confidence: 99%

Fatigue life improvement of cast ZK60 Mg alloy through low temperature closed-die forging for automotive applications

et al. 2018

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Abstract. The influence of low-temperature closed-die forging on the quasi-static and cyclic behaviour of as-cast ZK60 magnesium alloy was investigated. As-cast ZK60 billets were forged at a ram speed of 20 mm/sec and a temperature of 250°C. While the yield strength of the starting alloy was 139 MPa, the forging process improved the yield strength significantly by ~68% to 234 MPa. Moreover, the stresscontrolled push-pull fatigue tests at the stress amplitudes of 140 MPa to 180 MPa revealed that the fatigue life was enhanced by an order of magnitude. Microstructural analyses besides the texture measurements at different locations of the forged part manifested partial grain refinement and texture modification strengthening mechanisms. It is believed that the fatigue life improvement is achieved in the wake of the grain refinement and the subsequent material strengthening.

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“…They found that an optimum billet extrusion temperature exists that provides a refined uniform grain structure, with maximum tensile and elongation properties. Ogawa et al (2002) demonstrated that ZK60-Mg alloy can be extruded with high extrusion ratios as high as 10.3 with extrusion temperatures higher than 300°C. An upper limit for the extrusion temperature range was established through the observation of the formation of significant oxidation on the billet surface.…”

Section: Manufacturabilitymentioning

confidence: 99%

Analysis of Lightweight Materials for the AM2 System

Allison¹,

Rushing²,

Garcia³

2014

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An analysis was performed on potential materials that could replace the 6061-T6 aluminum alloy currently used in the AM2 airfield matting for the purpose of light-weighting the design. An in-depth analysis was performed on metal and polymer matrix composites. However, neither groups of materials produced a suitable material based on operating conditions of the AM2. Newly developed extruded magnesium alloys were identified that could potentially provide weight savings of 30 to 40% while maintaining the current performance of the AM2. In addition, traditional high-strength aluminum alloys were identified that could provide substantial weight savings. However, manufacturing issues existed due to the high strength of these aluminum alloys. Finally, analysis was performed to determine the cost of manufacturing the AM2 using these alternate materials.

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Forming limit of magnesium alloy at elevated temperatures for precision forging

Cited by 154 publications

References 7 publications

Effect of Cold Forging and Static Recrystallization on Microstructure and Mechanical Property of Magnesium Alloy AZ31

Effect of Cold Forging and Static Recrystallization on Microstructure and Mechanical Property of Magnesium Alloy AZ31

Fatigue life improvement of cast ZK60 Mg alloy through low temperature closed-die forging for automotive applications

Analysis of Lightweight Materials for the AM2 System

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