Effect of grain shape on environmental embrittlement in Ni3Al tested at elevated temperatures
- 1 April 1989
- journal article
- Published by Springer Nature in Journal of Materials Research
- Vol. 4 (2) , 294-299
- https://doi.org/10.1557/jmr.1989.0294
Abstract
This paper describes the effect of grain shape on environmental embrittlement in boron-doped Ni3Al (24 at. % Al). The alloy showed severe embrittlement when tested at 600 and 760 °C in air. The embrittlement can be alleviated by control of grain shape, and the material with a columnar-grained structure produced by directional levitation zone remelting shows good tensile ductilities when tested in oxidizing environments. The columnar-grained structure with vertical grain boundaries minimizes the normal stress and consequently suppresses nucleation and propagation of cracks along the boundaries.Keywords
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