钪和钇改性的AA 6086铝镁硅合金中的弥散相

Dispersoids in Al-Mg-Si Alloy AA 6086 Modified by Sc and Y.

作者信息

Zupanič Franc, Žist Sandi, Albu Mihaela, Letofsky-Papst Ilse, Burja Jaka, Vončina Maja, Bončina Tonica

机构信息

Faculty of Mechanical Engineering, University of Maribor, Smetanova 17, SI-2000 Maribor, Slovenia.

Impol 2000 d.d., Partizanska ulica 38, SI-2310 Slovenska Bistrica, Slovenia.

出版信息

Materials (Basel). 2023 Apr 7;16(8):2949. doi: 10.3390/ma16082949.

DOI:10.3390/ma16082949

PMID:37109786

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10142497/

Abstract

The aluminium alloy AA 6086 attains the highest room temperature strength among Al-Mg-Si alloys. This work studies the effect of Sc and Y on the formation of dispersoids in this alloy, especially L1-type ones, which can increase its high-temperature strength. A comprehensive investigation was carried out using light microscopy (LM), scanning (SEM), and transmission (TEM) electron microscopy, energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), differential scanning calorimetry (DSC), and dilatometry to obtain the information regarding the mechanisms and kinetics of dispersoid formation, particularly during isothermal treatments. Sc and Y caused the formation of L1 dispersoids during heating to homogenization temperature and homogenization of the alloys, and during isothermal heat treatments of the as-cast alloys (T5 temper). The highest hardness of Sc and (Sc + Y) modified alloys was attained by heat-treating alloys in the as-cast state in the temperature range between 350 °C and 450 °C (via T5 temper).

摘要

铝合金AA 6086在铝镁硅合金中具有最高的室温强度。本研究探讨了Sc和Y对该合金中弥散相形成的影响，特别是L1型弥散相，其可提高合金的高温强度。采用光学显微镜（LM）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）、能谱仪（EDS）、X射线衍射仪（XRD）、差示扫描量热仪（DSC）和热膨胀仪进行了全面研究，以获取弥散相形成的机制和动力学信息，特别是在等温处理过程中的信息。Sc和Y在合金加热至均匀化温度及均匀化过程中，以及在铸态合金（T5态）的等温热处理过程中导致了L1弥散相的形成。通过在350℃至450℃的温度范围内对铸态合金进行热处理（通过T5态），Sc和（Sc + Y）改性合金获得了最高硬度。