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.
Increasing demand for energy leads to an increase in greenhouse gas emissions. The most dangerous greenhouse gas is carbon dioxide, whose emissions will double in the next 20 years. The paper presents the concept and feasibility study of CO2 storage in abandoned coal mines as one of the methods of CO2 sequestration. The main advantages of this method are: close location to the source of emissions, low cost of storage, high capacity of abandoned mine workings as well as remaining coal seams. The main obstacles to the realization of this method are: gas migration to the surface as a result of former mining operations and flooding of mines, proper sealing of all surface connections (shafts, adits, etc.), gas leakage over a long period of time and material stability in aggressive environment. The paper presents the concept of high pressure CO2 storage and the CO2 storage regime in a coal mine.
