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<p>Al-Fe alloys have high thermal resistance ability but low strength, plasticity, and hardness due to the coarse Al<sub>3</sub>Fe phases separating the soft Al matrix. This work aims to prepare spinel (MgAl<sub>2</sub>O<sub>4</sub>) particle-reinforced Al–Fe composite by in situ reactions of Fe<sub>2</sub>O<sub>3</sub> powder in an Al-Mg melts. The formation process of spinel particles and microstructure was investigated using scanning electron microscopy (SEM), X-ray diffraction (XRD), and transmission electron microscopy (TEM). Results show that the in situ reactions were govern by diffusion of Mg, Al and O elements and completed at 900&#xa0;℃ for 25&#xa0;min. Mg addition improved the wettability of Al melts to Fe<sub>2</sub>O<sub>3</sub> particles. Spinel particles less than 0.6&#xa0;μm in size were uniformly distributed in Al matrix. The fine spinel crystals had coherent relationships such as <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\({(\overline{1 }\overline{1 }\overline{1 })}_{Al}//{(\overline{2 }\overline{2 }\overline{2 })}_{Spinel}\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <msub> <mrow> <mo stretchy="false">(</mo> <mover> <mn>1</mn> <mo>¯</mo> </mover> <mover> <mn>1</mn> <mo>¯</mo> </mover> <mover> <mn>1</mn> <mo>¯</mo> </mover> <mo stretchy="false">)</mo> </mrow> <mrow> <mi mathvariant="italic">Al</mi> </mrow> </msub> <mo stretchy="false">/</mo> <mo stretchy="false">/</mo> <msub> <mrow> <mo stretchy="false">(</mo> <mover> <mn>2</mn> <mo>¯</mo> </mover> <mover> <mn>2</mn> <mo>¯</mo> </mover> <mover> <mn>2</mn> <mo>¯</mo> </mover> <mo stretchy="false">)</mo> </mrow> <mrow> <mi mathvariant="italic">Spinel</mi> </mrow> </msub> </mrow> </math></EquationSource> </InlineEquation>, <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\({(1\overline{3 }\overline{1 })}_{Al}//{(2\overline{6 }\overline{2 })}_{Spinel}\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <msub> <mrow> <mo stretchy="false">(</mo> <mn>1</mn> <mover> <mn>3</mn> <mo>¯</mo> </mover> <mover> <mn>1</mn> <mo>¯</mo> </mover> <mo stretchy="false">)</mo> </mrow> <mrow> <mi mathvariant="italic">Al</mi> </mrow> </msub> <mo stretchy="false">/</mo> <mo stretchy="false">/</mo> <msub> <mrow> <mo stretchy="false">(</mo> <mn>2</mn> <mover> <mn>6</mn> <mo>¯</mo> </mover> <mover> <mn>2</mn> <mo>¯</mo> </mover> <mo stretchy="false">)</mo> </mrow> <mrow> <mi mathvariant="italic">Spinel</mi> </mrow> </msub> </mrow> </math></EquationSource> </InlineEquation>, and <InlineEquation ID="IEq3"> <EquationSource Format="TEX">\({(2\overline{2 }0)}_{Al}//{(4\overline{4 }0)}_{Spinel}\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <msub> <mrow> <mo stretchy="false">(</mo> <mn>2</mn> <mover> <mn>2</mn> <mo>¯</mo> </mover> <mn>0</mn> <mo stretchy="false">)</mo> </mrow> <mrow> <mi mathvariant="italic">Al</mi> </mrow> </msub> <mo stretchy="false">/</mo> <mo stretchy="false">/</mo> <msub> <mrow> <mo stretchy="false">(</mo> <mn>4</mn> <mover> <mn>4</mn> <mo>¯</mo> </mover> <mn>0</mn> <mo stretchy="false">)</mo> </mrow> <mrow> <mi mathvariant="italic">Spinel</mi> </mrow> </msub> </mrow> </math></EquationSource> </InlineEquation> to α-Al and <InlineEquation ID="IEq4"> <EquationSource Format="TEX">\({(115)}_{{Al}_{3}Fe}//{(\overline{1 }3\overline{1 })}_{{MgAl}_{2}{O}_{4}}\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <msub> <mrow> <mo stretchy="false">(</mo> <mn>115</mn> <mo stretchy="false">)</mo> </mrow> <mrow> <msub> <mrow> <mi mathvariant="italic">Al</mi> </mrow> <mn>3</mn> </msub> <mi>F</mi> <mi>e</mi> </mrow> </msub> <mo stretchy="false">/</mo> <mo stretchy="false">/</mo> <msub> <mrow> <mo stretchy="false">(</mo> <mover> <mn>1</mn> <mo>¯</mo> </mover> <mn>3</mn> <mover> <mn>1</mn> <mo>¯</mo> </mover> <mo stretchy="false">)</mo> </mrow> <mrow> <msub> <mrow> <mi mathvariant="italic">MgAl</mi> </mrow> <mn>2</mn> </msub> <msub> <mi>O</mi> <mn>4</mn> </msub> </mrow> </msub> </mrow> </math></EquationSource> </InlineEquation> to Al<sub>3</sub>Fe crystals,. This study disclosed the in situ reaction mechanism and the formation process of microstructure, offering a novel preparation technique for spinel particle-reinforced Al-Fe composites with high performances.</p>

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Study on Formation Process of Spinel (MgAl2O4) Particles Through In Situ Reactions of Fe2O3 Powder in Al–Mg Melts

  • 期刊论文

  • 发表日期：

    2026年2月24日

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  • Hao Lian,
  • Z. M. Shi,
  • Wenlong Yu,
  • Ge Zhao,
  • Y. Wang,
  • Na Pang

摘要

Al-Fe alloys have high thermal resistance ability but low strength, plasticity, and hardness due to the coarse Al3Fe phases separating the soft Al matrix. This work aims to prepare spinel (MgAl2O4) particle-reinforced Al–Fe composite by in situ reactions of Fe2O3 powder in an Al-Mg melts. The formation process of spinel particles and microstructure was investigated using scanning electron microscopy (SEM), X-ray diffraction (XRD), and transmission electron microscopy (TEM). Results show that the in situ reactions were govern by diffusion of Mg, Al and O elements and completed at 900 ℃ for 25 min. Mg addition improved the wettability of Al melts to Fe2O3 particles. Spinel particles less than 0.6 μm in size were uniformly distributed in Al matrix. The fine spinel crystals had coherent relationships such as \({(\overline{1 }\overline{1 }\overline{1 })}_{Al}//{(\overline{2 }\overline{2 }\overline{2 })}_{Spinel}\) ( 1 ¯ 1 ¯ 1 ¯ ) Al / / ( 2 ¯ 2 ¯ 2 ¯ ) Spinel , \({(1\overline{3 }\overline{1 })}_{Al}//{(2\overline{6 }\overline{2 })}_{Spinel}\) ( 1 3 ¯ 1 ¯ ) Al / / ( 2 6 ¯ 2 ¯ ) Spinel , and \({(2\overline{2 }0)}_{Al}//{(4\overline{4 }0)}_{Spinel}\) ( 2 2 ¯ 0 ) Al / / ( 4 4 ¯ 0 ) Spinel to α-Al and \({(115)}_{{Al}_{3}Fe}//{(\overline{1 }3\overline{1 })}_{{MgAl}_{2}{O}_{4}}\) ( 115 ) Al 3 F e / / ( 1 ¯ 3 1 ¯ ) MgAl 2 O 4 to Al3Fe crystals,. This study disclosed the in situ reaction mechanism and the formation process of microstructure, offering a novel preparation technique for spinel particle-reinforced Al-Fe composites with high performances.