中间相NiAl的力学行为

R. T. Pascoe, C. Newey
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引用次数: 164

摘要

摘要本文研究了不同成分的NiAl多晶和不同取向的化学计量单晶在77 ~ 1300°k温度范围内的压缩变形行为。-%铝)在77°K下可变形。单晶的塑性变形具有很强的各向异性。所有的多晶和单晶均表现出b.c.c.合金屈服应力的三阶段温度依赖性。非化学计量的主要作用是增加屈服应力的非热贡献;空位(富铝合金)产生的强化大于取代原子(富镍合金)产生的强化。
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The Mechanical Behaviour of the Intermediate Phase NiAl
AbstractThe deformation behaviour of polycrystalline NiAl of various compositions, and of stoichiometric single crystals with different orientations, has been studied in compression in the temperature range 77–1300° K. All alloys except the aluminium-rich composition (53 at.-% aluminium) were deformable down to 77°K. Plastic deformation of single crystals was strongly anisotropic. All polycrystals and single crystals exhibited the three-stage temperature-dependence of the yield stress typical of b.c.c. alloys. The main effect of non-stoichiometry was to increase the athermal contribution to the yield stress; the strengthening produced by vacancies (aluminium-rich alloys) was greater than that produced by substitutional atoms (nickel-rich alloys).
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