超声振动工艺下微量Sc对A380合金组织性能的影响

发布时间：2018-03-16 19:34

本文选题：Sc　切入点：超声波振动　出处：《中南大学学报(自然科学版)》2017年10期 　论文类型：期刊论文

【摘要】：在超声振动工艺下加入质量分数为0~0.5%的稀土Sc对A380合金进行变质处理,以研究稀土Sc对A380合金微观组织和力学性能的影响。研究结果表明:在超声振动工艺下,加入微量Sc可以使A380合金微观组织中的初生α相显著细化,由粗大的树枝晶变为细小、无定向的枝晶,并且形态变得圆整,出现大量蔷薇状和颗粒状的α相;当Sc加入量为0.3%时,对α相的细化效果最理想;同时,超声振动工艺下微量Sc还使A380合金微观组织中的共晶Si和Al3Fe Si2相尺寸显著减小,由粗大的针状变为蠕虫状和点状;加入0.3%Sc的A380合金,其铸态下抗拉强度为314 MPa,屈服强度为223 MPa,伸长率为3.7%,勃氏硬度为109,此时,晶粒粒度最小,约为31μm,形状因子最大,为0.75。
[Abstract]:In order to study the effect of rare earth SC on microstructure and mechanical properties of A380 alloy, the influence of rare earth SC on the microstructure and mechanical properties of A380 alloy was studied by adding 0 ~ 0. 5% rare earth SC in ultrasonic vibration process. The addition of trace SC can significantly refine the primary 伪 phase in the microstructure of A380 alloy, from a coarse dendrite to a fine, unoriented dendrite, and the morphology becomes round, and a large number of rose and granular 伪 phases appear. At the same time, the size of eutectic Si and Al3Fe Si2 phase in the microstructure of A380 alloy was significantly reduced from coarse needle-like to worm-like and spot-shaped, and the microelement SC also decreased the size of eutectic Si and Al3Fe Si2 phase in the microstructure of A380 alloy when the content of SC was 0.3%. The tensile strength, yield strength, elongation and hardness of A380 alloy were 314 MPA, 223 MPA, 3.7 and 109 respectively. At this time, the grain size was the smallest, about 31 渭 m, and the shape factor was the largest (0.75).
【作者单位】：湖南大学汽车车身先进设计制造国家重点实验室;湖南涉外经济学院机械工程学院;中南大学材料科学与工程学院;
【基金】：国家自然科学基金资助项目(51275165) 湖南省“十二五”重点建设学科资助项目(080204)~~
【分类号】：TG146.21

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