Thermodynamic investigation of the aluminum-chromium system
Source abstract
Abstract
In the course of a thorough investigation of the Al-Cr-Nb ternary system, the intermetallic compounds of the Al-Cr system were investigated by direct reaction calorimetry at high temperatures. New enthalpies of formation were determined and compared with literature data. X-ray powder diffraction (XRD), electron probe microanalysis (EPMA), and differential thermal analysis (DTA) were carried out on calorimetric products as well as on heat-treated alloys. A eutectoid decomposition of the Al11Cr2 phase $$\left( {Al11 Cr_2 \leftrightarrow Al_7 Cr + Al_4 Cr} \right)$$ was discovered. The eutectic nature of the equilibrium involving Al7Cr with Al solid solution was verified and this contradicts the published phase diagram. The hexagonal (Al4Mn structure type) of Al4Cr was confirmed.
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Research context
OpenAlex topics: Thermodynamic and Structural Properties of Metals and Alloys · Metallurgical and Alloy Processes · X-ray Diffraction in Crystallography
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References (26)
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