Title: Microstructures and room temperature mechanical properties of Mg-5Zn-3Al-0.2Mn casting alloy
Abstract: The as-cast microstructures of sand-casting magnesium alloys Mg-5Zn-3Al-0.2Mn were studied,which was found to contain δ-Mg and(τ(Mg_(32)(Al,Zn)_(49))) phases.By adding trace elements Sr,Ti and B into the melt of the alloys,the primary grain of(δ-Mg) is refined,meanwhile the morphology of τ phase is changed from semi-netted shape to short rods or spheres,and the distribution of τ phase tends to be more homogeneous.In the case of additions of 0.06%Ti,(0.012%B,) and 0.1%Sr,δ-Mg grain is greatly refined and the best room temperature mechanical properties are gotten.It is also found that the ultimate strength and the elongation of Mg-5Zn-3Al-0.2Mn alloy greatly increase when the alloy is quenched after annealed at higher temperature.The microstructure of Mg-5Zn-3Al-0.2Mn alloy is transformed from binary phase microstructure into δ-Mg solid solution due to the dissolution of τ phase after annealed at 343℃ for 17h,and meanwhile the mechanical properties reach the maximum values,i.e.,σ_b 245MPa,δ 12%.
Publication Year: 2006
Publication Date: 2006-01-01
Language: en
Type: article
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