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相场法研究Ni-Al间作用势对Ni75Al14Cr11合金L10预析出相的影响
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1.浙江师范大学工学院;2.西北工业大学

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国家自然科学基金资助(项目号51501165);浙江省自然科学基金一般项目(LY18E010002和Y18E050011);浙江省基础公益研究计划项目(LGG18E050010)资助


Phase-field simulation for influence of Ni-Al interatomic potential on L10 pre-precipitation phase of Ni75Al14Cr11 alloy
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    摘要:

    采用微观相场法研究了Ni75Al14Cr11合金第一个近邻到第四个近邻Ni-Al原子间相互作用势对L10预析出相沉淀过程的影响。结果表明,当第三近邻Ni-Al原子间相互作用势增大或第四种近邻Ni-Al原子间相互作用势减少时,L10预析出相和L12平衡相均提前沉淀,且L10预析出相体积分数减少而L12相的最终体积分数几乎不变;当第三近邻Ni-Al原子间相互作用势减少或第四近邻Ni-Al原子间相互作用势的增大时,L10预析出相和L12最终相都会推迟沉淀,且L10预析出相和L12相体积分数均增大;与上述两种情况相比,改变第一近邻Ni-Al原子间相互作用势对L10预析出相沉淀过程的影响较小,而改变第二近邻Ni-Al原子间相互作用势对沉淀过程几乎没有影响。进一步研究表明,Ni-Al原子间相互作用势改变不影响合金的沉淀机制,将影响L10预析出相、L12平衡相的析出时间、速度和两种相的体积分数,沉淀形貌等,从而影响Ni75Al14Cr11高温合金的结构和性能,对合金优化设计有指导意义。

    Abstract:

    The influence of Ni-Al interatomic potential from the first-nearest neighbor to the fourth-nearest neighbor on the precipitation process of L10 pre-precipitation phase in Ni75Al14Cr11 alloy was investigated by the Microscopic Phase-Field method. As the third-nearest Ni-Al interatomic potential increases or the fourth-nearest interatomic potential decreases, L10 pre-precipitation phase and L12 phase appears in advance; besides, the volume fraction of L10 pre-precipitated phase decreases while the final volume fraction of L12 phase almost remains unchanged. Whereas the opposite, L10 pre-precipitation phase and L12 phase appears later; besides, the volume fraction of both phases increases. Compared with the above two, the first-nearest interatomic potential has the less impact and the second-nearest Ni-Al interatomic potential has the least impact on the precipitation process of L10 pre-precipitation phase and L12 phase. Further research shows that Ni-Al interatomic potential does not affect the precipitation mechanism of the alloy and will affect the precipitation time, speed, volume fraction and precipitation morphology of L10 pre-precipitation phase and L12 equilibrium phase, thus affecting the structure and properties of Ni75Al14Cr11 superalloy, which has guiding significance for alloy optimization design.

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董卫平,汪彬,宫宁宁,陈铮.相场法研究Ni-Al间作用势对Ni75Al14Cr11合金L10预析出相的影响[J].稀有金属材料与工程,2020,49(1):169~176.[dongweiping, Wang Bin, Gong Ningning, Chen Zheng. Phase-field simulation for influence of Ni-Al interatomic potential on L10 pre-precipitation phase of Ni75Al14Cr11 alloy[J]. Rare Metal Materials and Engineering,2020,49(1):169~176.]
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  • 收稿日期:2018-11-23
  • 最后修改日期:2018-12-24
  • 录用日期:2019-01-10
  • 在线发布日期: 2020-02-16
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