Low-Temperature Tensile Properties of Fe-Ni Alloys
Tensile properties at 295, 195, 76, and 4 K were measured for eight face-centeredcubic Fe-Ni alloys, ranging from 36-wt% Ni to pure Ni. The elastic limit, yield and tensile strengths, and elongation to failure are reported. Results indicate that the elastic limit and tensile yield and ultimate strengths increase as the Fe content increases. However, the tensile elongation to failure does not appear to depend on Fe content.
Deformation twins were detected in alloys ranging from Fe-36 wt% Ni to Fe-78 wt% Ni. The stress and strain to initiate detectable deformation twins by means of optical microscopy were measured for these alloys. Results show that the initiation of deformation twinning correlates best with deformation energy (stress × strain). These results are discussed in terms of the stacking-fault energy.
KeywordsYield Strength Ultimate Strength Elastic Limit Nickel Content Deformation Energy
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