アルミニウム・クロム合金の研究 : アルミニウム・クロム合金の平衡状態圖並に機械的性質及耐蝕性に就て
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The phase boundaries in the equilibrium diagram of aluminium and chromium alloys, containing up to about 50% of chromium, have been determined by the thermal, fusion, and microscopic analysis between 450° and 1, 100℃. Three peritectic reactions were ascertained to take place at 1, 018°, 803°, and 660℃., where two chemical compounds, having the compositions of Al_2Cr and Al_4Cr, and a solid solution are formed, respectively. The limit of solid solubility of chromium in aluminium at 640℃. was found to be between 0.67 and 0.80%, and the value is constant as the temperature falls down to 470℃. Rolled sheets of the alloys, containing up to 1.6% of chromium, were subjected to mechanical and corrosion tests after heat-treatments. The tensile properties slightly rise as the chromium increases. The alloy of about 0.7% of chromium showed remarkably higher tensile strength on the annealing than those of surrounding compositions. The phenomenon was assumed to, probably, be due to its higher recrystallization temperature than the others. Corrosion tests were carried out by the "alternate wet and dry" method in the artificial sea water for a month, and the corrosion which occured was observed by change in mechanical properties. The samples of about 0.7% of chromium, which had been annealed, were found to be exceptionally resistant comparing those of surrounding compositions, and even better than the annealed pure aluminium. Corrosion resisting property of this alloy of particular composition which has been annealed seems worth while to be considered in connection with its abnormal high tensile strength stated above.
- 社団法人日本鉄鋼協会の論文
- 1936-03-25
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