EFFECT OF RECRYSTALLIZATION ON ENVIRONMENTAL EMBRITTLEMENT OF A NI3AL-BASED ALLOY

摘要

The effects of recrystallization on room temperature tensile properties and susceptibility to test environments (air versus vacuum) of a Ni3Al-based alloy have been investigated. The results indicate that recrystallization treatment not only increases ductility but also reduces susceptibility to test environment of the alloy. The fracture mode has also been observed in the scanning electron microscope (SEM). It was found that air promoted transgranular cleavage fracture and reduced the amount of ductile fracture for unrecrystallized and partially recrystallized microstructures. In completely recrystallized specimens, the ductile fracture mode remained unchanged when test environment changed from vacuum to air. [References: 18]