Abstract
In this work, a bulk nanocrystalline WE43 alloy prepared through rotary swaging was subjected to the aging treatment at different temperatures. The mechanical property and microstructure variations during aging were systematically studied. Aging at 175 °C enhanced the alloy to be maximumly with 516 MPa in ultimate tensile strength (UTS), 477 MPa in yield strength (YS) and 8.5% in elongation to failure. The significant strengthening effect resulted from rare-earth elements segregation at grain boundary. During aging at 225 °C, tremendous enhancement was obtained in the initial stage of aging, while the formation of massive precipitates along grain boundary deteriorated the strength as aging time was prolonged.
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