CAJ | 학술논문

在H2气氛下，采用半固态轧制工艺将Al-5.8Zn-1.63Mg-2.22Cu-0.12Zr(质量分数)粉末成功轧制成相对密度为76.1%~88.0%的生带材。分析了温度对生带材显微组织和力学性能的影响规律。当轧制温度由580°C上升到610°C时，加速了原始颗粒边界和内部孔洞的消失、粒子的扩散、晶界的变化；显微组织演变的机制由致密为主的阶段转变为以晶粒粗化为主的阶段；η(MgZn2)相的数量在减少，更多的Al2Cu粒子在晶界处析出。获得了Al-5.8Zn-1.63Mg-2.22Cu-0.12Zr (质量分数)粉末的最佳半固态轧制温度。当液相分数为53%~67%时可以制备出具有较高密度的生带材。该研究有助于采用半固态轧制将金属粉末制备出性能较好的带材。
재H2기분하，채용반고태알제공예장Al-5.8Zn-1.63Mg-2.22Cu-0.12Zr(질량분수)분말성공알제성상대밀도위76.1%~88.0%적생대재。분석료온도대생대재현미조직화역학성능적영향규률。당알제온도유580°C상승도610°C시，가속료원시과립변계화내부공동적소실、입자적확산、정계적변화；현미조직연변적궤제유치밀위주적계단전변위이정립조화위주적계단；η(MgZn2)상적수량재감소，경다적Al2Cu입자재정계처석출。획득료Al-5.8Zn-1.63Mg-2.22Cu-0.12Zr (질량분수)분말적최가반고태알제온도。당액상분수위53%~67%시가이제비출구유교고밀도적생대재。해연구유조우채용반고태알제장금속분말제비출성능교호적대재。
Under H2 atmosphere, the green strips were prepared from Al-5.8Zn-1.63Mg-2.22Cu-0.12Zr (mass fraction, %) powders by the semi-solid rolling process with a relative density from 76.1%to 88.0%. The role of temperature on microstructure and mechanical properties was investigated. With increasing rolling temperature from 580 to 610 °C, the disappearance of primary powder boundary and isolated pores, inter-diffusion of species and the change of grain boundary were accelerated. Moreover, the mechanism of microstructure evolution changes from the densification dominant regime to the coarsening dominant regime; the amount of η (MgZn2) phase decreased and more Al2Cu particles precipitated at grain boundaries. The optimum temperature for semi-solid rolling of Al-5.8Zn-1.63Mg-2.22Cu-0.12Zr powders was determined. The liquid fraction in the range of 53%to 67%corresponds with a high density level of green strips. The present experimental analysis suggests that semi-solid powder rolling can be optimized to manufacture strips with high mechanical properties.