Effects of Al and Zn contents and heat treatment on microstructures and tensile properties of Mg-Al-Zn alloys

雄, 吉田; 啓太, 新井; 正太, 伊藤; 重晴, 鎌土; 敏秋, 和田; 卓, 松永; 隆志, 吉本; 陽, 小島

doi:10.2464/jilm.55.456

Cited by 5 publications

(5 citation statements)

References 19 publications

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“…With increasing Al contents shear bands increase and grain size decreases to less than 3μm by lowering rolling temperatures every passes as shown in Fig. 7 [24]. Fig.8 [24] shows SEM images of as-rolled specimens.…”

Section: Application Of Hot Rolling To Mg Alloymentioning

confidence: 90%

“…Microstructures of Hot Rolled Magnesium Alloy Sheet. Our research group is also developing rolled magnesium alloy sheets with high strength and good workability [24,25]. With increasing Al contents shear bands increase and grain size decreases to less than 3μm by lowering rolling temperatures every passes as shown in Fig.…”

Section: Application Of Hot Rolling To Mg Alloymentioning

confidence: 99%

“…7 [24]. Fig.8 [24] shows SEM images of as-rolled specimens. Fine spherical β precipitates are observed as white particles in the specimens containing Al more than 3.5%.…”

Section: Application Of Hot Rolling To Mg Alloymentioning

confidence: 99%

“…Tensile Properties of Hot-rolled Mg-2.0-4.5%Al-0.7% -1.5%Zn Alloys. Fig.9 [24] shows tensile properties of the hot-rolled Mg-2.0-4.5%Al-0.7%-1.5%Zn Alloy sheets. At room temperature tensile strength and proof stress increase with an increase in Al content by grain refining and presence of fine precipitates, and elongation also increases by grain refining effect.…”

Section: Application Of Hot Rolling To Mg Alloymentioning

confidence: 99%

“…4.5%Al containing alloy has the highest elongation of 150% at 225°C. As Al content increases dynamic recrystallization occurs at smaller strain and finally forms finer recrystallized grains in the whole area [24]. Such a microstructural change from the early stage of the deformation may lead to grain boundary sliding, resulting in high elongation at high temperatures.…”

Section: Application Of Hot Rolling To Mg Alloymentioning

confidence: 99%

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Development of Magnesium Alloys with High Performance

Kamado

Kojima

2007

MSF

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In Mg-Al-Zn and Mg-Al-Mn alloys containing 2.0~6.0mass%Al and 0~1.5mass%Zn, grain refinement in the as-rolled (F) specimens containing large amount of Al and Zn are achieved by both dynamic recrystallization and dynamic precipitation during hot rolling and leads to high strength and high ductility at room temperature. At high temperatures, the tensile strength of the investigated alloys is almost the same, while the elongation of the F-specimens increases with increasing Al and Zn contents, leading to 150% in Mg-4.5%Al-1.5%Zn alloy. High Al and Zn contents alloys significantly accumulate large working strain in grain interiors, and involve large amounts of high angle grain boundaries and fine spherical precipitates, which can become the nucleation sites for recrystallization. Therefore, dynamic recrystallization in such alloys occurs at small strain region during tensile test. This dynamic recrystallization causes reduction of flow stress and large elongation by grain boundary sliding at high temperatures. Furthermore, .fine recrystallized grains contributes to deformation in normal direction, resulting in isotropic deformation behavior. Authors attempt to improve proof stress and its anisotropic property of Mg-Al-Zn wrought alloys by grain size and precipitates controls utilizing dynamic recrystallization and dynamic precipitation during hot extrusion. In the alloy specimens extruded at lower temperatures increasing Al and Zn contents enhance dynamic recrystallization and dynamic precipitation, resulting in grain refinement and large amount of Mg17Al12 precipitates. As a result, the extruded Mg-9%Al-1%Zn alloy specimen shows high tensile strength of 370MPa, 0.2% tensile proof stress of 240MPa and moderate elongation of 20%, which are almost same as standard values of tensile properties of T5-treated 6N01 Al extruded alloy. Furthermore, a ratio of compressive proof stress to tensile proof stress of the as-extruded specimen improves up to a higher ratio of 0.9 than that of Mg-3%Al-1%Zn alloy specimen with no precipitation, 0.5, due to prevention of tensile twin, which easily occurs during compressive deformation even under a low applied stress perpendicular to the extrusion direction, by dynamic precipitation of Mg17Al12 phase.

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Section: Application Of Hot Rolling To Mg Alloymentioning

confidence: 90%

Section: Application Of Hot Rolling To Mg Alloymentioning

confidence: 99%

“…7 [24]. Fig.8 [24] shows SEM images of as-rolled specimens. Fine spherical β precipitates are observed as white particles in the specimens containing Al more than 3.5%.…”

Section: Application Of Hot Rolling To Mg Alloymentioning

confidence: 99%

Section: Application Of Hot Rolling To Mg Alloymentioning

confidence: 99%

Section: Application Of Hot Rolling To Mg Alloymentioning

confidence: 99%

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