TiB2纳米颗粒对Al-Mn-Mg+3004合金中高温性能的影响.pdfVIP

Trans. Nonferrous Met. Soc. China 27(2017) 771−778 Influence of TiB nanoparticles on 2 elevated-temperature properties of Al−Mn−Mg 3004 alloy Kun LIU, A. M. NABAWY, X. G. CHEN Department of Applied Science, University of Quebec at Chicoutimi, Saguenay, QC G7H 2B1, Canada Received 27 April 2016; accepted 18 September 2016 Abstract: Two contents (1.5% and 3%) of TiB nanoparticles were introduced in Al−Mn−Mg 3004 alloy to study their effects on the 2 elevated-temperature properties. Results show that TiB nanoparticles were mainly distributed at the interdendritic grain boundaries 2 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 °C were increased by 20% and 13% respectively, while the minimum creep rate at 300 °C 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. Key words: Al−Mn−Mg 3004 alloy; TiB2 nanoparticle; dispersoid free zone; elevated temperature property; creep volume fraction of DFZ often forms in the peak