Development of high-performance flame-retardant wrought magnesium alloys and evolution for application of the alloys to high-speed railway body

Chino, Yasumasa; Shimizu, Kazunori; Noda, Masafumi; Yoshida, Katsuhiko; Ueda, Hironori; Ishikawa, Takeshi; Taguchi, Makoto; Yamada, Koji; Horiya, Takao; Mori, Hisashi

doi:10.2464/jilm.69.22

Cited by 12 publications

(3 citation statements)

References 4 publications

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“…Magnesium alloy is a promising structural material that can reduce the weight of large-scale transportation structures such as train and automobile [1][2][3][4][5][6][7]. For a long time, the inflammability of magnesium alloy has been one of the obstacles to its extensive usage.…”

Section: Introductionmentioning

confidence: 99%

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Fatigue strength and fatigue crack initiation mechanism in non-combustible Mg-4%Al-1%Ca-0.2%Mn alloys and its TIG and MIG weld joints

SHAO,

THAO,

NAKATA

et al. 2023

Preprint

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Fatigue mechanism of a Mg-4%Al-1%Ca (hereinafter referred to as AX41) non-combustible magnesium alloy and its TIG(Tungsten Inert Gas) and MIG(Metal Inert Gas) weld joint was investigated through the plane bending fatigue and crack propagation tests. Results of plane bending fatigue tests showed that fatigue strengths of TIG and MIG weld joints were lower than that of the base metal (BM), while a similar fatigue strength at 107 cycles was found in both TIG and MIG weld joints. However, a TIG weld joint showed the highest crack propagation resistance among tested samples in crack propagation tests. Scanning electron microscopy and electron backscatter diffraction (EBSD) analysis were used to investigate the relationship between microstructural factors and crack initiation mechanism of AX41 alloy and its weld joint. Cracks were found to initiate from grains in BM, while weld defects became a crack initiation site in a MIG weld joint. However, both grains and weld defects were observed as a crack initiation site in a TIG weld joint. Results of EBSD analysis indicated that fatigue crack initiation in TIG weld joint was favored in large grains with high Schmid factors. The critical value of initial crack length was discussed in correlation between the maximum grain size and the maximum weld defects/inclusions size on the fatigue crack initiation mechanisms. As a result, prediction method of the fatigue strength at 107 cycles was proposed based on the hardness and weld defects/inclusions size.

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Section: Introductionmentioning

confidence: 99%

“…Mg-4%Al-1%Ca(hereinafter referred to as AX41) alloy is expected to be applicated to ceilings and floorboards of high-speed railway body [1]. This alloy possesses excellent non-combustibility and machinability.…”

Section: Introductionmentioning

confidence: 99%

Fatigue strength and fatigue crack initiation mechanism in non-combustible Mg-4%Al-1%Ca-0.2%Mn alloys and its TIG and MIG weld joints

SHAO,

THAO,

NAKATA

et al. 2023

Preprint

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“…Lightweight magnesium (Mg) alloys show tremendous promise for applications in the aerospace, transportation, and mobile electronics industries. 1,2 The use of these alloys or their integration into the current product structures can be improved by employing effective joining technologies for similar and dissimilar material combinations. To date, most Mg alloy components have been mechanically fastened with other parts in the production of small lots of complex components; however, welds can be stronger and less expensive for long production runs.…”

mentioning

confidence: 99%

Corrosion of Linear-Friction-Welded AZ91 and AZX912 Mg-Al Alloys

Nakatsugawa

Wanjara

Villegas-Armenta

et al. 2022

J. Electrochem. Soc.

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The corrosion performance of the AZ91 and AZ91+2%Ca (AZX912) magnesium alloys joined using linear friction welding was investigated. For similar and dissimilar metal combinations – namely AZ91/AZ91, AZX912/AZX912, and AZ91/AZX912, the performance was evaluated by mass loss analysis and the scanning vibrating electrode technique in 1 wt.% NaCl solution. Galvanic behavior between AZ91 and AZX912 was examined by potentiostatic polarization and galvanic current measurements. Approximately 0.3–0.6-mm-thick seamless weld zones were generated in all of the welds, which did not show any appreciable changes in the surface profiles acquired after the corrosion test. The corrosion-induced mass loss rate of the AZ91/AZX912 dissimilar weld was 10% higher than those of the AZ91/AZ91 and AZX912/AZX912 similar welds. The galvanic test indicated that AZ91 and AZX912 were the anodic and cathodic regions, respectively, with a difference in the corrosion potential of 20–30 mV. The corrosion of the AZ91/AZX912 weld was presumed to proceed via a macro-galvanic cell between the base alloys, whereas the weld acted as a bridge and did not influence the corrosion.

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Development of Flame-Retardant Wrought Magnesium Alloys and Application of the Alloys to High-Speed Railway Body

Chino

Shimizu

Kido

et al. 2022

The Minerals, Metals &Amp; Materials Series

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Development of high-performance flame-retardant wrought magnesium alloys and evolution for application of the alloys to high-speed railway body

Cited by 12 publications

References 4 publications

Fatigue strength and fatigue crack initiation mechanism in non-combustible Mg-4%Al-1%Ca-0.2%Mn alloys and its TIG and MIG weld joints

Fatigue strength and fatigue crack initiation mechanism in non-combustible Mg-4%Al-1%Ca-0.2%Mn alloys and its TIG and MIG weld joints

Corrosion of Linear-Friction-Welded AZ91 and AZX912 Mg-Al Alloys

Development of Flame-Retardant Wrought Magnesium Alloys and Application of the Alloys to High-Speed Railway Body

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