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不同含量的TiB_2纳米颗粒(1.5%和3%)分别加入3004合金研究TiB_2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,TiB_2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,TiB_2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TiB_2纳米颗粒的合金相比,加入3%TiB_2纳米颗粒的3004合金在常温和300°C下的屈服强度分别提高了20%和13%。同时,该合金在300°C下的最小蠕变速率也降低至未添加TiB 2纳米颗粒合金的1/5,体现了TiB_2纳米颗粒对Al-Mn-Mg合金中高温性能的强化作用。
The effects of different content of TiB 2 nanoparticles (1.5% and 3%) on the high temperature performance of Al-Mn-Mg 3004 alloy by adding 3004 alloy to TiB 2 nanoparticles respectively. Transmission electron microscopy and X-ray diffraction results show that TiB 2 nanoparticles are mainly distributed in the dendritic boundaries with the size of 20-80 nm. As a result, the volume fraction of the precipitate-free zone in the dispersed phase of the alloy is greatly reduced. Meanwhile, the addition of the TiB 2 nanoparticles effectively pinpoints the movement of grain boundaries and dislocations, thereby improving the strength and creep resistance of the alloy. After peak precipitation heat treatment, the yield strength of 3004 alloy with 3% TiB 2 nanoparticles increased by 20% and 13% at room temperature and 300 ° C, respectively, compared with the alloy without TiB_2 nanoparticles. At the same time, the minimum creep rate of the alloy at 300 ° C is also reduced to 1/5 of the alloy without addition of TiB 2, which shows the strengthening effect of TiB 2 nanoparticles on the high temperature performance of Al-Mn-Mg alloy.