不同含量的TiB2纳米颗粒(1.5%和3%)分别加入3004合金研究TiB2纳米颗粒对Al-Mn?Mg 3004合金中高温性能的影响.透射电镜和X射线衍射结果表明,TiB2纳米颗粒主要分布在枝晶界,尺寸在20~80 nm.因此,合金中弥散相无析出带的体积分数大幅减少,同时,TiB2纳米颗粒的添加有效钉扎了晶界和位错的移动,从而提高了合金的强度和抗蠕变性能.在经过峰值析出热处理后,与未添加TiB2纳米颗粒的合金相比,加入3%TiB2纳米颗粒的3004合金在常温和300℃ 下的屈服强度分别提高了20%和13%.同时,该合金在300℃ 下的最小蠕变速率也降低至未添加TiB2纳米颗粒合金的1/5,体现了TiB2纳米颗粒对Al?Mn?Mg合金中高温性能的强化作用.
Two contents (1.5% and 3%) of TiB2 nanoparticles were introduced in Al-Mn-Mg 3004 alloy to study their effects on the elevated-temperature properties. Results show that TiB2 nanoparticles were mainly distributed at the interdendritic grain boundaries with a size range of 20-80 nm, which is confirmed by transmission electron microscopy (TEM) and X-ray diffraction (XRD). Therefore, the volume fraction of the dispersoid free zones is greatly reduced and the motion of grain boundaries and dislocations is inhibited more effectively at elevated temperature. After peak precipitation heat treatment, the yield strengths in the alloy with 3%TiB2 addition at room temperature and 300 ℃ were increased by 20% and 13% respectively, while the minimum creep rate at 300 ℃ was reduced to only 1/5 of the base alloy free of TiB2, exhibiting a considerable improvement of elevated-temperature properties in Al-Mn-Mg alloys.
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