The Impact Testing of Various Alloys at Low Temperatures
In recent years there has been an increasing demand for materials suitable for fabrication of equipment utilized at cryogenic temperatures. In order for the designer to properly choose such materials, it has been found necessary to acquire reasonably accurate data on mechanical properties at low temperatures. One of the most important properties with which the designer is concerned, is the notch toughness or the impact strength of notched specimens. It has been found that the face centered cubic type of metals are tough at the very low temperatures when subjected to an impact type of loading. Perhaps the most important of these metals are copper, aluminum, and nickel. It is expected that the alloys of these elements are also tough at cryogenic temperatures. This paper presents results of the testing from 296° to 24°K of notched impact specimens of copper, aluminum, and Haynes (nickel) alloys. The majority of these alloys exhibited only a moderate change in toughness with a large change in temperature but a few were found to be brittle at the low temperatures.
KeywordsAluminum Alloy Impact Strength Copper Alloy Liquid Hydrogen Notch Toughness
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