HOT-COMPRESSION BEHAVIOR OF Ni-Al-Zr ALLOYS

Hot-compression tests of the alloys Ni-Al-Zr were performed. The tests were performed on the equipment Gleeble 3800 at 800 degrees C. The Ni3Al based alloys with different content of zirconium were tested in as-cast and directionally solidified state. Solidified samples were prepared from castings by Bridgman's method. The alloys exhibit good values of yield strength and maximal achieved stress for this type of material. The alloys in directed state have better values of yield strength then as-cast alloys. The structure of alloys depends on the aluminum content. The alloys with 24 at.% Al are formed by phases Ni3Al and Zr-rich phase Ni5Zr. The hypostoichiometric alloys are formed by phases Ni3Al, (Ni) and Zr-rich phase Ni5Zr.