1991
DOI: 10.1016/0956-7151(91)90029-z
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The yield strength of off-stoichiometric Ni3Al with and without boron

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Cited by 21 publications
(7 citation statements)
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“…Most authors [1,2,3,4] state that in their polycrystalline form, they are brittle at room temperature and fracture in the intercrystalline mode. This is due to their intrinsically weak grain boundaries, caused by the structural state of the material, but these can be influenced for instance by the solidification procedure [S], by boron and other additions [3,4,5,6,7,8], or by the outer environment [9]. The countermeasure which has been studied most frequently is a boron addition, which can significantly enhance both ductility and yield strength [7].…”
Section: Introductlonmentioning
confidence: 99%
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“…Most authors [1,2,3,4] state that in their polycrystalline form, they are brittle at room temperature and fracture in the intercrystalline mode. This is due to their intrinsically weak grain boundaries, caused by the structural state of the material, but these can be influenced for instance by the solidification procedure [S], by boron and other additions [3,4,5,6,7,8], or by the outer environment [9]. The countermeasure which has been studied most frequently is a boron addition, which can significantly enhance both ductility and yield strength [7].…”
Section: Introductlonmentioning
confidence: 99%
“…This is due to their intrinsically weak grain boundaries, caused by the structural state of the material, but these can be influenced for instance by the solidification procedure [S], by boron and other additions [3,4,5,6,7,8], or by the outer environment [9]. The countermeasure which has been studied most frequently is a boron addition, which can significantly enhance both ductility and yield strength [7]. Boron, however, may segregate [2] and thereby affect the structure and geometry of the grain boundaries, grain size and growth, and the cohesive strength of the grains [3,41 ; it may also modify the Ni3Al alloy by dissolving in it, thereby increasing the concentration of interstitials and macroscopically strengthening the matrix by increasing the resistance of the matrix and of its defects to dislocation glide [7].…”
Section: Introductlonmentioning
confidence: 99%
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“…Finally, the strengthening per fractional increase in lattice parameter, Ad(Ac x E ) , of FeAl due to boron is in the range 0.23G -0.83G. This is substantially greater than the boron strengthening effect in Ni-based L12 compounds Le., Ac/(Ac x E ) = 0.04G, for Ni3Al [29,30,50] compounds.…”
Section: Nomentioning
confidence: 99%
“…Shulson et al, 1985 [6] established a relationship between effect of grain size (d ¼ 2.9e1100 mm) on the yield strength of Ni 3 Al at room temperature. Further, he reported yield strength of stoichiometric and non-stoichiometric NieAl alloys within the context of the structure and chemistry at the grain boundaries and discussed it in terms of the transmission of slip through either an ordered or a constitutionally disordered grain boundary [7]. Recent studies on the elastic properties of NieAl alloyed with Cr(7.5 at%) using in-situ X-ray diffraction under high pressure, and using nano-indentation techniques suggest that micro alloying with Cr although decreases the strength improves ductility and corrosive properties [8].…”
Section: Introductionmentioning
confidence: 99%