【摘 要】
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The morphology and kinetics evolution of γ'and γ phases in Ni-xAl-(20-x)Cr at％ (x =7.5-13.7) alloys aged at 700 ℃ were studied by utilizing the phase-field si
【机 构】
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School of Materials Science and Engineering,Nanjing University of Science and Technology,Nanjing,210
论文部分内容阅读
The morphology and kinetics evolution of γ'and γ phases in Ni-xAl-(20-x)Cr at％ (x =7.5-13.7) alloys aged at 700 ℃ were studied by utilizing the phase-field simulation.The separated γ'phases from γ matrix in low Al content (x ＜ 13) alloys transferred to the interconnected morphology with separated γ phases in high Al content(x ＞ 13) alloys,and long-time aging produced near cubic γ'phase.The coarsening rate of γ'phase declined firstly when the Al content x =7.5-9.0,then increased sharply as x ranges from 9 to 12,while the coarsening rate of γ phase declined directly.Additionally,the average edge-to-edge distance of neighboring γ'phases showed a three-stage variation when Al content x ＜ 9,it decreased to minimum value and increased slowly then decreased again with aging time.In contrast,when 9 ≤ x ＜ 13,the average particle distance of γ'phase decreased to a nearly constant value.With the coarsening of γ phase,their average particle distance increased.The kinetics evolution was clarified with the combined variations of the particle number density,average particle radius and volume fractions in the continuous composition Ni-xAl-(20-x)Cr at％ alloys.
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