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Abstract
The hot ductility of a range of Fe-Ni alloys was investigated by hot tensile testing the materials in the austenitic condition. The ductility of the alloys varied in a complex manner with composition, temperature, and strain rate. The mechanism of failure was studied in a 36% Ni alloy by metallographic examination. The results showed that low grain-boundary cracking incidence and good ductility were always associated with grain-boundary movement during testing and this correlation is discussed in terms of the effects that composition and testing conditions have on grain-boundary mobility.