Ni-Al二元合金γ相高温点阵常数及热膨胀系数的试验与计算研究  

Experimental and Computational Studies of Lattice Parameter and Thermal Expansion Coefficient of γ Phase in Ni-Al Alloy

作　　者：王治超 鲁晓刚[1,2] 朱娜琼 WANG Zhichao;LU Xiaogang;ZHU Naqiong(School of Materials Science and Engineering,Shanghai University,Shanghai 200444,China;Materials Genome Institute,Shanghai University,Shanghai 200444,China;Higher Vocational and Technical(International)College,Shanghai Second Polytechnic University,Shanghai 201209,China)

机构地区：[1]上海大学材料科学与工程学院,上海200444 [2]上海大学材料基因组工程研究院,上海200444 [3]上海第二工业大学高等职业技术(国际)学院,上海201209

出　　处：《上海金属》2021年第4期105-111,118,共8页Shanghai Metals

基　　金：国家重点研发计划(No.2017YFB0701502)。

摘　　要：采用高温X射线衍射及热膨胀法,测定了较宽温度范围内γ单相及γ+γ'两相Ni-Al合金中γ相的点阵常数及热膨胀系数。将试验结果与文献中的计算结果进行比较,发现在600~900℃范围内γ相点阵常数与热膨胀系数的试验值均小于Wang等的计算结果;相较于γ单相Ni-Al合金,γ+γ'两相合金中γ相点阵常数的试验值随温度的变化趋势与计算结果更吻合。分析认为,这是由于Wang等的点阵常数模型未考虑两相状态时共格应力对γ相点阵常数的影响。Lattice parameter and coefficient of thermal expansion(CTE)of γ phase in γ single-phase and γ+γ'two-phase Ni-Al alloys over a wide temperature range were measured by hightemperature X-ray diffraction and thermal dilation method.Comparing the experimental results with the calculated results in literature,it was found that the measured values of lattice parameter and CTE of γ phase in the temperature range of 600 to 900℃ were smaller than those calculated by Wang et al.The trend of variation of lattice parameter of γ phase with temperature in γ+γ'two-phase alloy obtained from experiment was more consistent with the calculated results than that in γ single-phase Ni-Al alloy.It resulted from that the effect of coherent stress on the lattice parameter of γphase in two-phase state was not considered in Wang et al’s lattice parameter model.

关 键 词：NI-AL合金 Γ相 点阵常数 热膨胀系数 高温X射线衍射 

分 类 号：TG113[金属学及工艺—物理冶金]