相场法研究Ni-Al间作用势对Ni75Al14Cr11合金L10预析出相的影响  

Phase-field Simulation for Influence of Ni-Al Interatomic Potential on L10 Pre-precipitation Phase of Ni75Al14Cr11 Alloy

作　　者：董卫平[1] 汪彬[3] 宫宁宁[3] 陈铮[2] Dong Weiping;Wang Bin;Gong Ningning;Chen Zheng(Zhejiang Normal University,Jinhua 321004,China;State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi’an 710072,China)

机构地区：[1]浙江师范大学工学院,浙江金华321004 [2]西北工业大学凝固技术国家重点实验室,陕西西安710072 [3]浙江师范大学,浙江金华321004

出　　处：《稀有金属材料与工程》2020年第1期169-176,共8页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51501165);浙江省自然科学基金一般项目(LY18E010002,Y18E050011);浙江省基础公益研究计划项目(LGG18E050010)。

摘　　要：采用微观相场法研究了Ni75Al14Cr11合金第1个近邻到第4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3近邻Ni-Al原子间相互作用势增大或第4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3近邻Ni-Al原子间相互作用势减少或第4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2种情况相比,改变第1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2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2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。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.Results show that 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 remains almost unchanged.Whereas,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 but 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.

关 键 词：相场法 预析出相 Ni75Al14Cr11合金 原子间相互作用势 

分 类 号：TG111.5[金属学及工艺—物理冶金]