单晶镍基合金中γ,γ′两相的晶格常数及影响因素  

Lattice Parameters and Effects Factors of Single Crystal Nickel-base Superalloy

作　　者：王明罡[1,2] 田素贵[1] 于兴福[1] 李唐[1] 

机构地区：[1]沈阳工业大学材料科学与工程学院,沈阳110178 [2]长春工业大学材料科学与工程学院,长春130012

出　　处：《材料工程》2009年第S2期79-82,共4页Journal of Materials Engineering

基　　金：国家自然科学基金资助项目(50571070)

摘　　要：通过对单晶镍基合金的组织形貌观察和XRD谱线分析,研究了元素铼对单晶合金晶格常数及错配度的影响。结果表明:2%Re镍基单晶合金经完全热处理后,其组织结构是由尺寸约为350～400nm的立方γ′相以共格方式嵌镶在γ基体相所组成;在γ,γ′两相镍基合金的XRD谱线中,衍射峰不对称的原因是由于γ,γ′两相衍射峰叠加所致。对不同合金在不同条件下XRD分离谱线的的分析表明,随元素Re含量增加,合金中γ,γ′两相在室温的晶格常数略有增大,而晶格错配度的绝对值减小。随温度提高,合金中γ,γ′两相的晶格常数及晶格错配度的绝对值增大,并进一步测算出合金中γ,γ′两相在不同温度区间的热膨胀系数。By means of microstructure observation and XRD diffraction analysis,an investigation has been made into the influence of the element Re on the lattice parameters and misfits of the single crystal nickel based superalloys.Results show that,after full heat treated,microstructure of 2%Re suprealloy consists of the cubic γ' phase with the size about 350-400nm embedded coherently in the γ matrix phase.In XRD patterns of the superalloys with γ',γ phases,the asymmetry reason of XRD peaks is attributed to the overlap of the peaks of γ' and γ phases.It is shown by analyzing XRD patterns of the alloys at different conditions that the lattice parameters of γ',γ phases at room temperature increases slightly,and absolute values of the lattice misfit decrease slightly with the increase of the element Re content.And the parameters of the γ',γ phases and absolute values of the misfits increases with temperatures elevated.And in the further,the thermal expansion coefficient of γ' and γ phases at different temperature interval are calculated.

关 键 词：单晶镍基合金 元素Re XRD分析 晶格常数 错配度 

分 类 号：TG146.15[一般工业技术—材料科学与工程]