| 1 | Twinning behavior of hot extruded AZ31 hexagonal prisms during uniaxial compression显示文摘Hot-extruded magnesium alloy AZ31 bar was cut into hexagonal prisms and then compressed at room temperature with the loading direction parallel to the extrusion direction(ED)or perpendicular to ED.The effective stress and strain evolution at center and corner region of the hexagonal prisms was simulated by using DEFORM 3D,while microstructure evolution was characterized by electron backscatter diffraction(EBSD).Relationship between twinning behavior and stress-strain evolution during compression at room temperature was studied.The results indicated that the compressive stress and strain levels at central region of hexagonal prisms were lower than those at the corner parts.EBSD examination revealed that{10-12}twins activate during the compression and the volume fraction of twins at corner parts were less than that at the central parts,which was attributed to twin thickening and coalescence behaviors.Meanwhile,the EBSD map indicated that the arise of{10-11}contraction twins and{10-11}-{10-12}double twins in compressed samples,especially in the corner region with loading axis perpendicular to ED,which were considered to be related to the high stress level at corner region.The dislocation slips led to low-angle boundaries in LA⊥ED and LA//ED. | Y.R.Zhao L.L.Chang J.Guo Y.P.Jin | 2019 | Journal of Magnesium and Alloys2019，7，1： | 11 |
| 2 | INVESTIGATION ON TWO-BODY WEAR OF AUSTENITIC MANGANESE STEEL THROUGH NUMERICAL QUADRATURE显示文摘The mathematic calculation on two-body wear of austenitic manganese steel has been performed by means of the elastic contact theory, stress interferometer and SEM.Stress distribution in contacted area was calculated and the mechanism on two-body wear has been investigated through numerical quadrature. Results show that two-body wear is mainly plowing wear, the cracks of abrasive dust originates from the region between 0.2α and 0.5α (α is radius of contacted round). Driving force to make crack extension along y axis is Tyzmax and extension direction is 45° with horizon. Driving forces to make crack extension along x axis is alternative σx and Tyzmax, the direction of crack extension is 37° with horizon. | J.P.Xie H.L.Yuan A.Q.Wang W.Y.Wang Y.R.Zhao | 2004 | Acta Metallurgica Sinica(English Letters)2004，17，3： | 1 |
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