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- W2077887612 abstract "The lack of tensile ductility in polycrystalline B2 NiAl has been attributed to the lack of five independent slip systems to satisfy von Mises' criterion for compatibility in polycrystalline deformation. Single crystal studies (4-10) show that the deformation of this alloy is highly anisotropic. The non- oriented crystals (soft orientations) are much more ductile than the oriented crystals (hard orientations) at low temperature. This is because the critical resolved shear stress required to activate primary slip of the type is much less than that required to activate other slip systems as the type. All orientations possess considerable ductility even when tested in tension at intermediate temperatures (>-- 673K). There is general agreement that for non- oriented crystals, deformation involves (100) and /l brace/110/r brace/ slip systems at low as well as intermediate temperatures. The behavior of oriented crystals is less clear and conflicting data exist: slip direction with /l brace/123/right brace/ and /l brace/112/r brace/ slip planes have been observed at low temperatures; while , and directions have been reported for high temperature deformation. The number of slip systems which operate if only the /l brace/110/r brace/ slip occurs is insufficientmore » for von Mises's criterion for polycrystalline deformation. In compression, ductility is observed since there is no driving force to open cracks that must form at grain boundaries due to the lack of sufficient slip systems. In tension, however, the applied stress acts directly to open the crack and failure may occur before further deformation can take place. On the other hand, if slip is possible (as in the case of disordered BCC alloys as well as some other compounds), there are enough slip systems of the type /l brace/110/r brace/ , to satisfy von Mise's criterion and lead to polycrystalline tensile ductility.« less" @default.
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- W2077887612 date "1989-01-01" @default.
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- W2077887612 title "Room temperature tensile ductility in polycrystalline B2 NiAl" @default.
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- W2077887612 doi "https://doi.org/10.1016/0036-9748(89)90083-5" @default.
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