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作 者:廖海洪[1] 张济祥[2] 梁敏洁[1] 白培康[1]
机构地区:[1]中北大学材料科学与工程学院,山西太原030051 [2]昆明贵金属研究所,云南昆明650106
出 处:《材料热处理学报》2016年第5期221-225,共5页Transactions of Materials and Heat Treatment
基 金:山西省自然科学基金(2013011014-1);山西省青年科技研究基金(2009021028)
摘 要:基于三元微观相场动力学模型,结合原子图像、序参数和体积分数等手段,模拟了Ni_(75)Al_(12)Cr_(13)合金在900 K下的沉淀行为。结果表明:合金沉淀过程中析出L_(12)和DO_(22)两种有序相;L_(12)相的早期沉淀机制为失稳分解,DO22相的早期沉淀机制为非经典形核和失稳分解的混合机制;L_(12)相首先从无序固溶体中析出,随后DO_(22)相在L_(12)相的畴界处析出;平衡时,获得的L_(12)相的体积分数大于DO_(22)相体积分数。Based on the dynamic model of ternary microscopic phase-field,a simulation on the precipitation behavior of Ni_(75)Al_(12)Cr_(13) alloy at 900 K was made by combining the means of atomic pictures,order parameter and volume fraction. The result of the simulation shows that two kinds of ordered phase with different structures,L_(12) and DO_(22),are formed in the process of precipitation. Moreover,the mechanism of the early precipitation of L_(12) phase is a kind of spinodal decomposition,and that of the DO_(22) phase is a kind of mixed mechanism comprising of non-classical nucleation and spinodal decomposition. Furthermore,the L_(12) phase is firstly separated out from the random solid solution,and then the DO_(22) phase is separated out from the domain boundary of the L_(12) phases. In addition,when the equilibrium is reached,the volume fraction of L_(12) phase is larger than that of the DO_(22) phase.
关 键 词:Ni-Al-Cr合金 沉淀 序参数 微观相场
分 类 号:TG146.1[一般工业技术—材料科学与工程]
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