The influence of boron-doping on the effectiveness of grain boundary hardening in Ni{sub 3}Al
Journal Article
·
· Acta Materialia
- City Univ. of Hong Kong, Kowloon (Hong Kong). Dept. of Physics and Materials Science
- Univ. of Birmingham (United Kingdom). School of Metallurgy and Materials
- Central Iron and Steel Research Inst., Beijing (China)
The influence of boron-doping on the effectiveness of grain boundary hardening in Ni{sub 3}Al has been investigated by measuring microhardness profiles across grain boundaries of binary and boron-doped Ni{sub 3}Al bicrystals. It was found that although boron gives rise to significant solution strengthening in Ni{sub 3}Al, the effectiveness of grain boundary hardening in Ni{sub 3}Al is lessened by the addition of boron. Furthermore, the contribution of grain boundary hardening to the overall strength decreases as the segregation extent of boron at the grain boundary increases. A theoretical model of grain boundary hardening considering the various effects of boron-doping has been developed. Application of the model can deconvolute the individual effects of boron-doping on solution hardening, distribution of microcavities along grain boundaries and the interaction of dislocations on different slip systems. Analyzing the experimental results with the model suggests that boron-doping can (1) improve the transfer efficiency of shear stress across a grain boundary by reducing the amount of microcavities along the grain boundary; (2) suppress the hardening effect from the interaction of dislocations moving on different slip systems; and (3) cause a significant solution hardening effect.
- OSTI ID:
- 353473
- Journal Information:
- Acta Materialia, Journal Name: Acta Materialia Journal Issue: 6 Vol. 47; ISSN 1359-6454; ISSN ACMAFD
- Country of Publication:
- United States
- Language:
- English
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