论文部分内容阅读
研究了不同混合稀土添加量对铸态及固溶态ZL301合金显微组织和力学性能的影响。结果表明,混合稀土能细化铸态合金的晶粒,形成Al-RE相,沿晶界不连续分布,起到晶界强化作用,从而提高了合金的抗拉强度和伸长率。当混合稀土添加量为0.5%、固溶处理工艺为435℃×16h时,ZL301合金的综合性能达到最佳。当混合稀土添加量为0.8%时,Al-RE相开始沿晶界连续分布,降低了晶界的结合强度,合金的强度和韧性下降。
The effects of different RE content on the microstructure and mechanical properties of as-cast and solid solution ZL301 alloys were investigated. The results show that the mixed rare earth can refine the as-cast alloy grains and form Al-RE phase, which is discontinuously distributed along the grain boundaries and plays a role of grain boundary strengthening, thereby increasing the tensile strength and elongation of the alloy. When the content of mixed rare earth is 0.5% and the solution treatment process is 435 ℃ × 16h, the comprehensive performance of ZL301 alloy is best. When the RE content is 0.8%, the Al-RE phase begins to distribute along the grain boundaries continuously, reducing the bonding strength at the grain boundaries and decreasing the strength and toughness of the alloy.