关键词: Al－Si涂层, Ni基高温合金, 脆－塑性转变, 疲劳行为

Abstract:

High temperature microscope with loading equipment has been used and the brittle ductility transformation temperature of Al Si coating has been measured. Research results show that brittle ductility transformation temperature of Al Si coating decreases with decreasing of Al and Si contents. Al and Si contents can be decreased by heat treatment which induces obviously a decrease of microhardness and brittle ductility transformation temperature of coating. The fracture mode and mechanism for both nickel base superalloy and coating at different temperatures have been investigated in this paper.

Key words: Al-Si coating, nickel-base superalloy, br ittle-ductility tr ansformation temper ature, fatigue behaviors