The thermal behavior of aluminum 5083 alloys deformed by equal channel angular pressing

Equal channel angular pressing (ECAP) has an advantage of being capable of achieving a submicron grain size. The 5083 Al alloy is a typical non-heat treatable Al-Mg based alloy that possesses many interesting characteristics as a structural material. In this study, a 5083 aluminum alloy was processed by equal channel angular pressing at 473 K to produce an ultra-fine grain size of about 200 nm. Aluminum 5083 was deformed by ECAP following route Bc up to eight passes at 473 K. The grain size was changed from about 200 μm to 300 nm by deformation. The specific heat capacity was increased monotonically with temperature rise, however, in the high temperature region at about 800 K, the trend is slightly different and this is thought to be caused by the re-crystallization of the ECAP process or precipitation, and therefore, the specific heat capacity was influenced by the amount of energy release.