On the Mechanical Properties and Structures of Quenched Ti-Al-Co Alloys

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  • Ti-Al-Co合金の焼入状態における組織と機械的性質について
  • Ti-Al-Co ゴウキン ノ ヤキイレ ジョウタイ ニ オケル ソシキ ト キカイテキ セイシツ ニ ツイテ

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Abstract

The effects of Al, Co and Ti2Co precipitates on the mechanical properties were examined by tensile testing, hardness measurement and structure analysis. The results obtained were as follows: α phase is strengthened by Al. and β phase is strengthened markedly by Co, but not by Al. Ti2Co increases the strength of structure, when the precipitating temperature is low and the precipitate is fine. Considering these effects, it can be explained that for the specimen containing less than 4%Al, the strength becomes minimum when it has α+β+Ti2Co structure. For some of these specimens the yielding phenomena were observed. Generally, α+β+Ti2Co structure has low strength and elongation, and the elongation of α+β structure was found to be larger than that of α+Ti2Co structure, upon comparing the α+β structure with the α+Ti2Co structure which has the same strength.

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