SUN Yuan-yang, ZHAO Yu-hong, HOU Hua, ZHENG Xiao-juan, GUO Hui-jun
（School of Materials Science and Engineering, North University of China, Taiyuan 030051, China）
Abstract： The pre-precipitation processes of γ′ phase in Ni-Al-Ti alloy with different chemical compositions are investigated by microscopic phase-field dynamics model. The simulation results show that the early precipitated phase with L10 structure is formed before the formation of γ′ phase. With the increase of Al content, the composition of precipitated phase is transformed from the co-existence of γ′ phase and material phase into single γ′ phase. Furthermore, excessive Al content can stimulate the production of γ′ phase, and the conversion time from L10 phase to L12 phase will lag behind other samples with lower Al content. By analyzing the occupation probability of Ti, it can be found that the solid solution strengthening effect of Ti is reduced with the increase of Al component.
Key words： chemical composition; L10 phase; microscopic phase field model; volume fraction
CLD number： TG111.5Document code： A
Article ID： 1674-8042（2017）02-0178-07 doi： 10.3969/j.issn.1674-8042-2017-02-011
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相场法研究化学组成对Ni-Al-Ti合金γ′相早期沉淀过程的影响
孙远洋， 赵宇宏， 侯华， 郑晓娟， 郭慧俊
（中北大学 材料科学与工程学院， 山西 太原 030051）
摘要:通过微观相场动力学模型研究了化学组成对Ni-Al-Ti合金γ′相早期沉淀过程的影响。 研究结果表明， 在γ′相形成之前， 基体内部先析出L10结构的过渡相。随着Al成分的不断升高， 沉淀相组成逐渐由γ′相与基体相两相共存变为单一的γ′相， 同时大量的Al会促进γ′相的形成， 从而引起体积其体积分数增大， 但L10相向L12相的转化时间有所延长。 通过分析Ti原子占位情况发现， 随Ti含量的减少， Ti的固溶强化作用有所减弱。
关键词:化学组成; L10相; 微观相场模型; 体积分数
引用格式：SUN Yuan-yang, ZHAO Yu-hong, HOU Hua, et al. Phase-field study for effect of chemical composition on pre-precipitation process of γ′ phase in Ni-Al-Ti alloy. Journal of Measurement Science and Instrumentation, 2017, 8(2)： 178-184. ［doi： 10.3969／j.issn.1674-8042.2017-02-011］Vol-8 No-2, Jun- 2017Journal of Measurement Science and Instrumentation185HE Mao-yong, et al. ／ In-situ reactive compatibilization of HDPE/GTR blends by dicumyl ...Journal of Measurement Science and InstrumentationVol-8 No-2, Jun- 2017
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