We studied the phase transformations at high temperatures in the carbonless heat-resistant nickel alloys by the differential thermal analysis and we calculated their thermal stability. For a relatively low alloyed compositions the greatest positive effect is achieved when it were alloyed by γ' -forming elements such as the niobium and titanium. The greatest thermal stability at temperatures below 1100°C is achieved for these alloys in the low alloyed composition. Multi-component carbonless heat resistant nickel alloys have the best characteristics when compositions contain the rhenium and a small amount of the tantalum. However, the most thermal stability at temperatures up to 1200°C has a composition that includes only 6% of tantalum.
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