EBSD analysis of the structural state of the Cu-Zn-Mn-Al-Fe-Ni alloy after hot deformation

摘要

The structural state of the Cu-Zn-Mn-Al-Fe-Ni alloy after high-temperature forming is studied. It is reported that in the section of a ring blank there are two structural zones with different amounts of strain. It has been found by EBSD analysis that in the maximum strain zone the alloy suffers dynamic recrystallization under forming, whereas in the minimum strain zone there is only dynamic polygonization, coarse grain boundaries become strengthened, this being ac-companied by an increase in the values of hardness to 300 HV 0.2; this causes their embrittlement and brittle grain-boundary cracking of the blank at room temperature under the effect of residual stresses.