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
Σ7 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
Σ7 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
Σ7 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.
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