Study on the Primary Recrystallization of a Commercial α-Brass (30%Zn)

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  • 工業的純度のα黄銅（Zn 30%）の1次再結晶に関する研究
  • コウギョウテキ ジュンド ノ アルファ オウドウ Zn30ノ 1ジ サイケッショウ ニ カンスル ケンキュウ
  • Study on the Primary Recrystallization of a Commercial α-Brass (30%Zn)

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Abstract

There are many investigations on the grain growth of α-Brass, but few on primary recrystallization of this alloy. Recently, Channon and co-workers studied this primary recrystallization isothermally by hardness measurement. The present authors also investigated primary recrystallization of a commercial α-Brass bearing 30%Zn by direct microscopic observation. The results obtained were as follows: (1) The activation energies of recrystallization QR was 48.2 kcal/mol with 30% reduction, and 46.2 kcal/mol with 50% reduction sheet with 50∼80% recrystallized fraction X, and decreased with decrease of X down to 50%. (2) Applying the Channon’s results, QR increased with an increase of the initial grain size, approaching a constant value. (3) Micro-Vicker’s hardness with unrecrystallized and recrystallized matrix decreased with an increase of annealing time, in the former case perhaps owing to recovery and in the latter case owing to grain growth. (4) The as-recrystallized grain size became finer with increasing reduction independ of temperature. (5) Under microscopic observation, the recrystallization nuclei appeared at the highly strained region, such as the grain boundary, the twin boundary and the slip band, preferentially.

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