Abstract
The effect of minor additions of magnesium on high temperature plasticity in Ni 3AlCrZrB ordered alloy has been investigated. Results of hot compression tests in a Gleeble apparatus showed that the maximum allowable deformation of a polycrystalline alloy with an appropriate magnesium content was about 50% at 1100 °C. An applicable content of magnesium also notably increased the stress-rupture life and tensile ductility at high temperature. The improvement of high temperature properties by magnesium is caused by the magnesium mainly segregated at grain boundaries and increasing the grain boundary coherence.
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