【摘要】 采用自制的镍基合金柔性布作为中间层合金对ＤＤ９８单晶高温合金进行瞬态液相（ＴＬＰ）连接，ＴＬＰ连接在１４７３—１５２３Ｋ，０．５－２４ｈ真空条件下进行．利用光学显微镜、扫描电镜时接头的微观结构和化学成分进行观察和分析，利用电子背散衍射测定了连接层和基体之间的结晶学取向．结果表明接头区域由连接区、中间金属／基体金属界面扩散区、基体金属区组成，均匀化处理后的接头与基体上的γ＇沉淀相的尺寸趋于一致，连接层与基体之间的取向匹配良好．更多还原

【Abstract】 The DD98 single crystal superalloy was bonded by transient liquid phase(TLP) bond- ing, in which a Ni base flexible metal cloth was used as an insert alloy. TLP bonding of DD98 superalloy was carried out at 1473-1523 K for 0.5-24h in vacuum. The melting characteristics of the interlayer was determined using differential thermal analysis(DTA). The bonded region was observed by optical microscopy, and the microstructural and compositional analyses across the bonded interlayer were per- formed by using a scanning electron microscopy(SEM). The electron back scattering diffraction(EBSD) method was applied to determine the crystallographic orientation. The results indicated that the joint zone consists of a bond, diffusion and base regions, and the γ＇phases both in the bonded interlayer and in the superalloy substrate are almost identical and the orientation relationship between the bonded interlayer and the bonded substrate has a good match.更多还原