Grain boundary pest of boron- doped Niin3Al at 1200 °C
Journal
Metallurgical Transactions A
Journal Volume
22
Journal Issue
8
Pages
1801-1809
Date Issued
1991
Author(s)
Abstract
A ductile Ni77.4Al22Zr0.6B0.2 alloy suffered severe intergranular embrittlement after air exposure at 1200 °C for 100 hours. However, the material survived after 1038 °C air exposure for 100 hours. Auger analysis showed enormous oxygen segregation on the grain boundaries in the 1200 °C, air exposed, boron-doped Ni3Al, while the boron segregation remained unchanged. To elucidate this type of grain boundary damage, a modified fracture mechanism was proposed. Finally, anomalous grain growth was found in this alloy after 1200 °C air exposure, and an explanation for this phenomenon was suggested. © 1991 The Minerals, Metals and Materials Society, and ASM International.
SDGs
Type
journal article