The plastic deformation of NiAl single crystals between 300°K and 1050°K

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Abstract
Single crystals of stoichiometric NiAl have been compressed in the temperature range 300°K to 1050°K. Contrary to previous work it has been found that in this range of temperature the flow stress of crystals compressed along ⟨100⟩ is not equal to that for crystals compressed along ⟨112⟩ but is three to four times greater. Experiments on crystals compressed along ⟨100⟩ have shown that there is a balance between two macroscopically different modes of deformation. The first of these modes, termed uniform deformation, is associated with low strain rates and/or high temperatures. The second mode, kinking, is a very localized form of deformation and as reported by other workers tend to occur at low temperatures but it is shown in the present work that kinking can be induced at high temperatures simply by increasing the strain rate. At the highest temperatures investigated, 1050°K, kinking occurs at a strain rate of about 10−2/sec. The results reported in this paper detail the differences and similarities of these two modes of deformation.

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