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| 1 | Microstructures and mechanical properties of friction stir processed Mge2.0Nde0.3Zne1.0Zr magnesium alloy显示文摘The effect of Friction stir process(FSP)parameters on the microstructure and mechanical properties of an extruded Mge2.0Nde0.3Zne1.0Zr(wt.%)alloy was investigated in this paper.The alloy was friction stir processed with different passes:single-pass,three-pass and five-pass,under a tool rotation rate of 800μm and a traverse speed of 200 mm min^(-1).FSP results in remarkable grain refinement of the extruded alloy(average grain size w3.8 mm as 3 passes)and almost complete dissolution of the Mg_(12)Nd phase in the matrix.With the increase of pass,the average grain size in the stir zone(SZ)is decreased firstly and then increases.The Vikers hardness of SZs in all FSPed samples is higher than that of the parent material(PM).Tensile tests at room-temperature show that the tensile strengths of the stir zones along the FSP advancing direction are slightly lower than those of PM.However,the elongations are remarkably improved from 13.0%for PM to 24.5%for SZ FSPed with three-passes.These improved tensile properties are attributed to the microstructure refinement,dynamic recrystallization and dissolution of the Mg_(12)Nd phase. | F.Y.Zheng Y.J.Wu L.M.Peng X.W.Li P.H.Fu W.J.Ding | 2013 | Journal of Magnesium and Alloys2013，1，2： | 8 |
| 2 | A FLOW STRESS MODEL FOR AZ61 MAGNESIUM ALLOY显示文摘The flow stress behaviors of AZ61 alloy has been investigated at temperature range from 523 to 673K with the strain rates of 0.001-1s-1.It is found that the average activation energy,strain rate sensitive exponent and stress exponent are different at various deformation conditions changing from 1i3.6 to 176.3k J/mol,0.125 to 0.167 and 6 to 8 respectively.A flow stress model for AZ61 alloy is derived by analyzing the stress data based on hot compression test.It is demonstrated that the flow stress model including strain hardening exponent and strain softening exponent is suitable to predicate the flow stress.The prediction of the flow stress of AZ61 alloy has shown to be good agreement with the test data.The maximum differences of the peak stresses calculated by the model and obtained by experiment is less than 8%. | H.T.Zhou X.Q.Zeng Q.D Wang W.J.Ding State Key Laboratory of Metal Matrix Composite,Shanghai Jiaotong University,Shanghai 200030,China | 2004 | Acta Metallurgica Sinica(English Letters)2004，17，2： | 8 |
| 3 | HEAT TREATMENT STRENGTHENING EFFECTS OF RARE EARTHS ON Mg-9Al ALLOY显示文摘Mg-9Al-xRE magnesium alloys were studied, where x is 0, 0.4, 0.8, 1.2 and 1.6% (inweight percent, wt%), respectively. Influence of rare earths (RE) on microstructureand strength in both T4 (solute heat treatment) and T6 (solute heat treatment andartificial ageing treatment) were investigated. Strength of specimen was tested at am-bient temperature. The microstructure was analyzed by optical microscopy, scanningelectron microscopy (SEM) and X-ray diffraction analysis. RE additions improvedT4 tensile strength of the treated alloys. Small addition (0.4wt%) of RE greatly im-proved the strength of ageing treated (T6) Mg-9Al alloy, but further additions caused decreasing. | Y.S.Wang J.Z.Yu Q.D.Wang W.J.Ding | 2003 | Acta Metallurgica Sinica(English Letters)2003，16，1： | 1 |
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