<正> 本文利用内耗测量,配合晶界附近区域的微区Auger电子能谱分析,X射线相结构分析。合金组织的观察及相应力学性能的测定,研究一种钴基高温合金中碳的弛豫内耗峰。 钴基高温合金经锻造成直径20mm试棒。冷拔成直径0.9mm细丝,均经石英管真空(4Pa)封接后在普通电炉内进行。1170℃,0.5h固溶处理和760℃的时效处理。合金成分列于表1,两种材料主要在La含量上有所差别。 在高温、高真空(4×10~(-3)Pa)、低频(～1
An internal friction peak near 370℃ is observed for a Co-base superalloy Co-22Ni-22Cr-14W. This is due to the C-C pairs of the interstitial solute C atoms which make the lattice distortion in different directions under stress, and is fairly corresponding with the segregation of C atoms, the precipitation of carbide and the ductility of the alloy. The C atoms segregate continuously toward the vicinity of grain boundary, and the peak reduces continuously its own height as the prolongation of aging time. The peak will soon disappear while the carbide precipitates out. The addition of La may influence the internal friction peak as well as the microstructure and mechanical properties of the alloy The increase of its activation energy and the retardation of carbide precipitated may be caused by the increase of La content in the alloy.
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