Abstract Scope |
We discovered a new compositionally complex oxide (CCO) with a spinel structure that is embedded in a new BCC compositionally complex alloy (CCA) matrix. The CCO, characterized by neutron diffraction and HETEM, has the chemical formula Mn(V,Ti,Al)2O4. The Mn atoms occupy the tetrahedral position while the V, Ti and Al atoms share the octahedral sites. The elements that take the octahedral sites are interchangeable. The CCO enhances the localized strength of the CCA, as observed in nano-indentation experiments. Besides, we report a novel low-activation BCC CCA with good tensile ductility at 650 ℃ or above, while poor tensile ductility is present at 500 ℃ or below, suggesting that the ductile-to-brittle transition temperature (DBTT) of the current CCA falls between 500 ℃ and 650 ℃. At a temperature above DBTT, the alloy deforms by the glide of dislocations, similar to conventional ductile BCC alloys, which is rare for non-refractory BCC CCAs. |