Ti-Al-Co 3元合金の加工性について

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タイトル別名
  • On the Formability of the Quenched Ti-Al-Co Alloys
  • Ti-Al-Co 3ゲン ゴウキン ノ カコウセイ ニ ツイテ

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抄録

The formability of quenched Ti-2∼8%Al-2∼8%Co alloys was studied by tensile tests and cold-rolling test. The values of δmax⁄σ(δ=δ<SUB>max)</SUB> were calculated as “formability index” from the tensile test, data where δ is the true strain, δmax is the limit value of the uniform elongation and σ is the true stress. High formability indices were shown by the specimens transforming to martensite from β phase by stress. Particularly, the formability index of Ti-4%Al-4%Co which was quenched from 900°C was a match for commercial pure Ti. Low formability indices were shown by the specimens having stable β phase structure. The specimens having α+Ti2Co, α+β+Ti2Co and α+β structure had moderate formability indices. Cold-rolling test indicated that the specimens transforming remarkably to martensite by stress had low reduction abilities and the specimens having stable β phase had excellent reduction abilities. Particularly, Ti-4%Al-8%Co and Ti-6%Al-6%Co quenched from β phase had the best reduction ability. The difference was caused by the reason that the ability of reduction in rolling was determined by initiation of cracks, which occurred when deformed over the limit of uniform elongation but not by the extent of uniform elongation. That is, the Ti-4%Al-8%Co alloy quenched from β phase has a low rate of strain hardening, therefore has a small uniform elongation, nevertheless can be deformed heavily beyond the limit of uniform elongation. On the other hand, the specimens forming stress-induced martensite have a high rate of strain hardening, therefore have a large uniform elongation, but begin the cracking when deformed beyond the limit of uniform elongation. It can be concluded that the specimens having a relatively stable β phase are suitable for forming, in the cases where large uniform elongation is not necessary, and the specimens readily forming stress-induced martensite are suitable for forming, in the cases requiring large uniform elongation.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 26 (8), 527-531, 1962

    公益社団法人 日本金属学会

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