Microstructure of an Al-Mn-Be-B alloy

作者：Zupanic F^*; Boncina T

来源：Journal of Alloys and Compounds, 2014, 617: 174-179.

DOI：10.1016/j.jallcom.2014.07.212

• Metals and alloys
• Quasicrystals
• Rapid-solidification
• Quenching
• Microstructure
• X-ray diffraction

The aim of this work was to determine the effect of boron on the solidification and processes taking place during heat treatment of an Al-Mn-Be-based alloy. Several phases formed upon slow cooling of the investigated alloy Al89Mn2Be2B7: BeB12, AlBeB, T-Al15Mn3Be2, Al6Mn and aluminium solid solution (Al-ss). An icosahedral quasicrystalline phase (IQC) was formed during rapid solidification by melt spinning; partly dissolving Be and B, while the remaining Be and B precipitated as a ternary compound AlBeB. The primary IQC persisted within the microstructure up to 400 degrees C, whilst at temperatures above 450 degrees C the initial microstructure started to transform quickly into AlBeB, Al6Mn and Al-ss, which appeared to be the stable phases below the alloy%26apos;s solidus temperature. The hardness remained almost unchanged up to 400 degrees C, whilst at temperatures above 450 degrees C it dropped abruptly.

• 出版日期2014-12-25