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• W2057993421 abstract "We began research on polycrystalline Ni3AI about a decade ago. At the time Aoki and Izumi (1) had already discovered that the addition of a small amount of boron effects a brittle-to-ductile (B/D) transition accompanied by a change from inletgranular to transgranular fracture, and Liu, White and Hortcm (2) were about to confirm the effect and to establish both that it does not occur on the Al-side of stoichiometry and that boron segregates to grain boundaries. Our objective was to produce a similar transition by refining the grains to below a critical ~ as one of us had done in NiAI (3). This was unsuccessful. Of the undoped stoichioruetric material we were studying, even 3 Rm grain-sized aggregates were brittle at room temperature (4). What we discovered, however, was something interesting about the yield stress. Grain boundaries, it turned out, contribute less to this property when the alloy contains boron (5). This result was int~wsting because, when combined with the attendant improvement in ductility, albeit less than in boron-doI~ Ni-rich alloys, it allowed a different interpretation of the B/D transition. Specificaliy, we raised the pouibility that the transition, instead of arising from an kupmvement in boundary cohesion (2), may arise fzom an improvement in the uansmission of slip across grain boundaries (5). In other words, instead of boron aiding the spread of plasticity throughout the aggregate primarily as the result of the boundaries becoming mote capable of supporting tensile stresses greater than the yield stress, we suggested that plasticity spreads because, in a way then undefined, boron retards the development of slip-induced stress concenu'ations which nucleate grain boundary cracks. This suggestion raised a number of questions. F~ instance: does localized plasticity precede fracture of the brittle alloys? Is slip sufficiently planar to allow stress concentrat~'s in the form of dislocation pile-ups to develop at grain boundaries? Does boron reduce the grain boundary contribution to the yield sltess of Hi-rich but not A1rich Ni3Al? How is slip transmitted, and how does boron facilitate this process? We have considered some of these questions and are currently exploring others. Here, we summarize our results to date, but leave most of the details to the literature cited. Our work was performed on six compositions of fully recrystaliized material prodoced by hot extrusion of powders, which resulted in chemically homogeneous, equlaxed microstmctm~s. The compositions (in aL%) were Ni-rich (24 Al), stoichiommric (25 AI)" @default.
• W2057993421 created "2016-06-24" @default.
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• W2057993421 date "1991-06-01" @default.
• W2057993421 modified "2023-10-16" @default.
• W2057993421 title "On slip transmission across grain boundaries and the brittle to ductile transition in Ni3Al and other L12 alloys" @default.
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• W2057993421 doi "https://doi.org/10.1016/0956-716x(91)90396-i" @default.
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