Abstract
In this study, the effects of beryllium (Be) and aluminum (Al) content on the microstructure evolution and strengthening mechanisms of Zr alloys were investigated. X-ray diffraction indicated that with increasing Al content in Zr alloys, the lattice parameter “a” of α-phase decreased and the axial ratio “c/a” increased. Microscopic analysis showed that prior-β grain size was substantially refined by increasing Be content. Scanning electron micrographs of the alloys showed that two types of precipitation of Be2Zr particles were present: (1) precipitation along the prior-β grain boundaries and (2) precipitation in the prior-β grains. An increase of Be2Zr particles and Al strongly affected the mechanical properties of Zr alloys. By increasing the Be2Zr and/or Al content, compressive strength was increased whereas the ductility decreased. The significant improvement in strength has been determined to occur through dispersion strengthening and solid solution strengthening.
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