The paper gives an overview of the phenomenon of minimum ductility temperature (MTD) in single-phase copper-nickel alloy. The influence of this phenomenon on environmental and economic aspects of production is presented. The authors characterized the behavior of these materials in high-temperature tensile tests and described possible causes of this effect. High-temperature ductility tests proved the existence of a relationship between microstructure, strain rate and the magnitude of the ductility temperature minimum phenomenon.