日本金属学会誌

J. Japan Inst. Metals, Vol. 53, No. 8 (1989),
pp. 745-752

Mechanism of the (100)[001] Texture Evolution from the Viewpoint of Coincidence Boundaries in BCC Alloys

Jirou Harase1 and Ryo Shimizu2

1R & D Laboratories II, Nippon Steel Corporation, Sagamihara
2R & D Laboratories III, Nippon Steel Corporation, Kita-Kyushu

Abstract:

The mechanism of (100)[001] texture evolution by grain growth was investigated by X-ray diffraction and back-reflection Laue diffraction methods, with the following results.
(1)  Sharp (100)[001] secondary recrystallized grains evolved from a primary recrystallized specimen having a major orientation of 236 < 5~15~9 > at 1273 K in the constant rate heating stage during the secondary recrystallization annealing. With the rise of heating temperature, the number of the (100)[001] secondary recrystallized grains increased and the secondary grains with (100)[011] orientation were also observed at 1373 K. At 1423 K a small number of the secondary recrystallized grains with (110)[001] were also observed. At 1473 K the secondary recrystallized grains with (110)[001] orientation disappeared, although the secondary recrystallized texture mainly composed of grains with (100)[001] orientation and a small number of the secondary gains with (100)[011] orientation were observed. The deviation of the secondary recrystallized grains from an ideal (100)[001] orientation increased with the annealing temperature.
(2)  The mechanism of the evolution of the (100)[001] texture by secondary recrystauization was found to be due to the highest frequency of Σ 7 coincidently oriented grains in relation to the (100)[001] orientation in the matrix texture before the onset of secondary recrystallization. The evolution of the (100)[011] oriented secondary grains at the latter stage of the secondary recrystallization annealing was considered to be due to the second highest frequency of Σ 7 coincidently oriented grains in relation to the (100)[011] orientation. The increase in the scatter of the orientation of (100)[001] secondaries from an ideal (100)[001] orientation was considered to be due to the decrease in the frequency of Σ 7 coincidently oriented grains with increasing deviation angle from the ideal (100)[001] orientation.
(3)  The present results support the hypothesis that grains having the highest frequency of coincidently oriented grains in the matrix can grow largest in the grain growth process.


(Received 1989/3/22)

Keywords:

recrystallization, secondary recrystallization, coincidence boundary, grain boundary migration, inhibitor, texture


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