A new unequal
channel angular pressing (UCAP) procedure is proposed for ultrafine-grained
metals and alloys. The microstructures and mechanical properties of
Mg-5.8Zn-1.2Y-0.7Zr alloys subjected to unequal channel angular pressing (UCAP) are investigated.
It is found that the optimum condition in UCAPed alloy is obtained at 523K with a largest elongation
to failure of 13.1% and ultimate tensile strength of ~400 MPa. Microstructural
observations show that the grain size is refined to ~1.0 μm during UCAP. The
probable mechanisms for these high mechanical properties are attributed to grain size and destroyed secondary phase
strengthening effects and fine precipitates formed during pressing at high
temperature by severe shear and plastic deformation.
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