材料
Online ISSN : 1880-7488
Print ISSN : 0514-5163
ISSN-L : 0514-5163
論文
マグネシウム合金AZ80押出材の応力腐食割れ感受性に及ぼす試験片採取方向の影響
中谷 正憲阿部 浩之花木 宏修内田 仁
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2015 年 64 巻 8 号 p. 655-661

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Stress corrosion cracking (SCC) of extruded magnesium alloy AZ80 in 0.004wt% sodium chloride (NaCl) solution at 298K was studied by slow strain rate tensile technique. The alloy was treated with naturally or artificially aging heat treatment. The eutectoid phase was precipitated by artificially aging. The specimen was machined from different orientations. One is loaded in the transverse direction with crack propagation in the longitudinal direction (i.e., T specimen). The other is loaded in the longitudinal direction with crack propagation in the radial direction (i.e., L specimen). The strain rate was changed from 8.33×10-6 to 8.33×10-3 s-1. The susceptibility to SCC was evaluated by fracture energy obtained by slow strain rate tensile tests. The SCC susceptibility of magnesium alloy increased with a decrease in strain rate irrespective of heat treatment and specimen orientation. The SCC susceptibility of L specimen was higher than that of T specimen. This was related with the anisotropy in corrosion resistance. In the case of L specimen, the SCC susceptibility was not affected by heat treatment condition. On the other hand, the SCC susceptibility of artificially aged T specimen is surely higher than that of naturally aged one though the artificially aging improved the corrosion resistance. It was suggested that SCC susceptibility of magnesium alloy is related with texture orientation and distribution of eutectoid phase.

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© 2015 日本材料学会
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