-3、10-2和10-1 s-1應(yīng)變速率條件下的高溫變形機制，著重研究微量納米準(zhǔn)晶顆粒對Mg-1.92Zn-0.34Y合金熱變形行為的影響。結(jié)果表明：半固態(tài)+熱擠壓的復(fù)合工藝制備了高塑性納米準(zhǔn)晶Mg-1.92Zn-0.34Y合金，其室溫下抗拉延伸率為44%±2.6%，抗拉強度為258±2.0 MPa，屈服強度為176±1.6 MPa。通過本構(gòu)關(guān)系獲得平均變形激活能達(dá)到271.7812 kJ/mol，其應(yīng)力指數(shù)為6.7838；Mg-1.92Zn-0.34Y合金具有較好的熱塑性，在研究條件下無失穩(wěn)現(xiàn)象，表明納米準(zhǔn)晶顆粒能夠強化其變形能力；最佳熱加工區(qū)域是：330~350 ℃，10-3~10-2 s-1，即高溫低應(yīng)變速率區(qū)。;The nano-quasicrystal reinforced Mg-Zn-Y alloy has ultra-high elongation at room temperature and has broad application prospects. It is necessary to further study its hot deformation behavior to provide a theoretical and application basis for subsequent processing. In this research, Mg-1.92Zn-0.34Y (wt%) alloy containing nano-quasicrystalline particles was prepared by semi-solid and hot extrusion composite process. The high temperature deformation mechanism of the alloy at temperatures of 250, 300 and 350 ℃ and strain rates of 10-3, 10-2 and 10-1 s-1 was investigated. The effect of nano-quasicrystal particles on hot deformation behavior of Mg-1.92Zn-0.34Y alloy was studied. The results show that the high-ductility Mg-1.92Zn-0.34Y alloy with nano-quasicrystals can be prepared by the combination process of semi-solid and hot extrusion. The processed alloy exhibits a high tensile elongation to failure (EL) of 44%±2.6%, ultimate tensile strength (UTS) of 258±2.0 MPa and yield strength (YS) of 176±1.6 MPa at room temperature. The average deformation activation energy and stress index of Mg-1.92Zn-0.34Y alloy according to the constitutive equation are 271.7812 kJ/mol and 6.7838, respectively. The alloy has good thermoplasticity and no instability phenomenon occurs under experimental conditions, which indicates that the presence of nano-quasicrystals improves the deformation ability of the alloy. The optimal hot working region is 330–350 ℃ and 10-3–10-2 s-1, that is, the high-temperature and low strain rate region."/>