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<p>Nb–Si-based in situ composites are receiving attention as a substitute for Ni-based alloys in aerospace, while poor toughness limits its application. In this work, the toughness of Nb<sub>4</sub>FeSi-containing Nb–Si-based alloys was improved by hot deformation. The different deformation behaviors of reinforcements from traditional alloys, including the eutectoid decomposition of β-Nb<sub>5</sub>Si<sub>3</sub>, and the stacking faults (SFs) and reorientation-induced plasticity (RIP) effect of Nb<sub>4</sub>FeSi, are revealed. During hot deformation, the β-Nb<sub>5</sub>Si<sub>3</sub> phase undergoes the eutectoid decomposition to obtain the α-Nb<sub>5</sub>Si<sub>3</sub> and niobium-based solid solutions (Nbss) phases, which α-Nb<sub>5</sub>Si<sub>3</sub> and Nbss satisfy the relationship {110}<sub>α</sub>//{110}<sub>Nbss</sub>. The [<InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="12598_2024_3030_Article_IEq1.gif" Format="GIF" Height="16" Rendition="HTML" Resolution="72" Type="Linedraw" Width="26" /> </InlineMediaObject> <EquationSource Format="TEX">\({1}\overline{1}{\text{0}}\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mn>1</mn> <mover> <mn>1</mn> <mo>¯</mo> </mover> <mtext>0</mtext> </mrow> </math></EquationSource> </InlineEquation>] SFs and lath-like reoriented variants are formed in the Nb<sub>4</sub>FeSi phase, where the matrix and variants follow [001]<sub>m</sub>//[111]<sub>v</sub>, (<InlineEquation ID="IEq2"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="12598_2024_3030_Article_IEq2.gif" Format="GIF" Height="16" Rendition="HTML" Resolution="72" Type="Linedraw" Width="26" /> </InlineMediaObject> <EquationSource Format="TEX">\({1}\overline{1}{\text{0}}\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mn>1</mn> <mover> <mn>1</mn> <mo>¯</mo> </mover> <mtext>0</mtext> </mrow> </math></EquationSource> </InlineEquation> )<sub>m</sub>//(<InlineEquation ID="IEq3"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="12598_2024_3030_Article_IEq3.gif" Format="GIF" Height="16" Rendition="HTML" Resolution="72" Type="Linedraw" Width="26" /> </InlineMediaObject> <EquationSource Format="TEX">\({1}\overline{1}{\text{0}}\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mn>1</mn> <mover> <mn>1</mn> <mo>¯</mo> </mover> <mtext>0</mtext> </mrow> </math></EquationSource> </InlineEquation> )<sub>v</sub>. Furthermore, the interface between matrix and variant is Σ33c symmetrical tilt boundaries, manifested as (<InlineEquation ID="IEq4"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="12598_2024_3030_Article_IEq4.gif" Format="GIF" Height="16" Rendition="HTML" Resolution="72" Type="Linedraw" Width="26" /> </InlineMediaObject> <EquationSource Format="TEX">\({1}\overline{1}{\text{0}}\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mn>1</mn> <mover> <mn>1</mn> <mo>¯</mo> </mover> <mtext>0</mtext> </mrow> </math></EquationSource> </InlineEquation>)/60°. The fracture toughness of the deformed alloy reaches 18.31&#xa0;MPa·m<sup>1/2</sup> at 1300&#xa0;°C/0.005&#xa0;s<sup>−1</sup>/0.7, which is 49% higher than the initial alloy.</p> Graphical abstract <p></p>

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Deformation mechanism of reinforcements in Nb4FeSi-containing Nb–Si-based in situ composites: eutectoid transformation and reorientation behavior

  • 期刊论文

  • 发表日期：

    2025年2月20日

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  • Qi-Bin Wang,
  • Qi Wang,
  • Rui-Run Chen,
  • Xiao-Wei Wang,
  • Yan-Qing Su,
  • Heng-Zhi Fu

摘要

Nb–Si-based in situ composites are receiving attention as a substitute for Ni-based alloys in aerospace, while poor toughness limits its application. In this work, the toughness of Nb4FeSi-containing Nb–Si-based alloys was improved by hot deformation. The different deformation behaviors of reinforcements from traditional alloys, including the eutectoid decomposition of β-Nb5Si3, and the stacking faults (SFs) and reorientation-induced plasticity (RIP) effect of Nb4FeSi, are revealed. During hot deformation, the β-Nb5Si3 phase undergoes the eutectoid decomposition to obtain the α-Nb5Si3 and niobium-based solid solutions (Nbss) phases, which α-Nb5Si3 and Nbss satisfy the relationship {110}α//{110}Nbss. The [ \({1}\overline{1}{\text{0}}\) 1 1 ¯ 0 ] SFs and lath-like reoriented variants are formed in the Nb4FeSi phase, where the matrix and variants follow [001]m//[111]v, ( \({1}\overline{1}{\text{0}}\) 1 1 ¯ 0 )m//( \({1}\overline{1}{\text{0}}\) 1 1 ¯ 0 )v. Furthermore, the interface between matrix and variant is Σ33c symmetrical tilt boundaries, manifested as ( \({1}\overline{1}{\text{0}}\) 1 1 ¯ 0 )/60°. The fracture toughness of the deformed alloy reaches 18.31 MPa·m1/2 at 1300 °C/0.005 s−1/0.7, which is 49% higher than the initial alloy.

Graphical abstract