<p>Precise control of crystallographic texture is an effective strategy for enhancing the ductility of magnesium alloys. This work establishes a direct correlation between non-basal dislocation evolution and texture modification, and elucidates the mechanisms responsible for the improved ductility of texture-modified alloys. Mg-Y alloys extruded at 350 °C, 380 °C, and 420 °C, exhibiting gradual changes in recrystallization fraction and texture components, were used as experimental materials. The results demonstrate that, with increasing extrusion temperature, both the densities and the ratio of pyramidal II <InlineEquation ID="IEq101"> <EquationSource Format="TEX">$ \left\langle {c\, + \,a} \right\rangle $</EquationSource> <EquationSource Format="MATHML"><math> <mfenced close="〉" open="〈"> <mrow> <mi>c</mi> <mspace width="0.166667em" /> <mo>+</mo> <mspace width="0.166667em" /> <mi>a</mi> </mrow> </mfenced> </math></EquationSource> </InlineEquation> to prismatic <InlineEquation ID="IEq1010"> <EquationSource Format="TEX">$ \left\langle a \right\rangle $</EquationSource> <EquationSource Format="MATHML"><math> <mfenced close="〉" open="〈"> <mi>a</mi> </mfenced> </math></EquationSource> </InlineEquation> dislocations increase, driving recrystallized nuclei to deviate progressively from their parent orientations and promoting the formation of <InlineEquation ID="IEq1"> <EquationSource Format="TEX">$ \left\langle {11\bar{2}1} \right\rangle $</EquationSource> <EquationSource Format="MATHML"><math> <mfenced close="〉" open="〈"> <mrow> <mn>11</mn> <mover accent="true"> <mrow> <mn>2</mn> </mrow> <mrow> <mo stretchy="false">¯</mo> </mrow> </mover> <mn>1</mn> </mrow> </mfenced> </math></EquationSource> </InlineEquation>-oriented and <InlineEquation ID="IEq2"> <EquationSource Format="TEX">$ \left\langle {1\bar{1}01} \right\rangle $</EquationSource> <EquationSource Format="MATHML"><math> <mfenced close="〉" open="〈"> <mrow> <mn>1</mn> <mover accent="true"> <mrow> <mn>1</mn> </mrow> <mrow> <mo stretchy="false">¯</mo> </mrow> </mover> <mn>01</mn> </mrow> </mfenced> </math></EquationSource> </InlineEquation>-oriented nuclei, whose orientations are parallel to the extrusion direction. The enhanced ductility of the texture-modified alloys is attributed to the combined activation of multiple non-basal slip systems and improved intergranular deformation compatibility. In particular, compared with a single <InlineEquation ID="IEq3"> <EquationSource Format="TEX">$ \left\langle {11\bar{2}1} \right\rangle $</EquationSource> <EquationSource Format="MATHML"><math> <mfenced close="〉" open="〈"> <mrow> <mn>11</mn> <mover accent="true"> <mrow> <mn>2</mn> </mrow> <mrow> <mo stretchy="false">¯</mo> </mrow> </mover> <mn>1</mn> </mrow> </mfenced> </math></EquationSource> </InlineEquation> texture, the dual texture of <InlineEquation ID="IEq4"> <EquationSource Format="TEX">$ \left\langle {11\bar{2}1} \right\rangle $</EquationSource> <EquationSource Format="MATHML"><math> <mfenced close="〉" open="〈"> <mrow> <mn>11</mn> <mover accent="true"> <mrow> <mn>2</mn> </mrow> <mrow> <mo stretchy="false">¯</mo> </mrow> </mover> <mn>1</mn> </mrow> </mfenced> </math></EquationSource> </InlineEquation> + <InlineEquation ID="IEq5"> <EquationSource Format="TEX">$ \left\langle {1\bar{1}01} \right\rangle $</EquationSource> <EquationSource Format="MATHML"><math> <mfenced close="〉" open="〈"> <mrow> <mn>1</mn> <mover accent="true"> <mrow> <mn>1</mn> </mrow> <mrow> <mo stretchy="false">¯</mo> </mrow> </mover> <mn>01</mn> </mrow> </mfenced> </math></EquationSource> </InlineEquation> exhibits superior intergranular compatibility, primarily due to more effective basal-to-basal slip transfer.</p>

Texture Modification Induced by Non-basal Dislocations and Its Effect on Mechanical Behavior of Mg-Y Alloys

期刊论文
发表日期：

2026年6月14日

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Zhenwei Gong,
Jing Zhang,
Lili Peng,
Yuhao Chen

摘要

Precise control of crystallographic texture is an effective strategy for enhancing the ductility of magnesium alloys. This work establishes a direct correlation between non-basal dislocation evolution and texture modification, and elucidates the mechanisms responsible for the improved ductility of texture-modified alloys. Mg-Y alloys extruded at 350 °C, 380 °C, and 420 °C, exhibiting gradual changes in recrystallization fraction and texture components, were used as experimental materials. The results demonstrate that, with increasing extrusion temperature, both the densities and the ratio of pyramidal II $ \left\langle {c\, + \,a} \right\rangle $ $〈c + a〉$ to prismatic $ \left\langle a \right\rangle $ $〈a〉$ dislocations increase, driving recrystallized nuclei to deviate progressively from their parent orientations and promoting the formation of $ \left\langle {11\bar{2}1} \right\rangle $ $〈11 \bar{2} 1〉$ -oriented and $ \left\langle {1\bar{1}01} \right\rangle $ $〈1 \bar{1} 01〉$ -oriented nuclei, whose orientations are parallel to the extrusion direction. The enhanced ductility of the texture-modified alloys is attributed to the combined activation of multiple non-basal slip systems and improved intergranular deformation compatibility. In particular, compared with a single $ \left\langle {11\bar{2}1} \right\rangle $ $〈11 \bar{2} 1〉$ texture, the dual texture of $ \left\langle {11\bar{2}1} \right\rangle $ $〈11 \bar{2} 1〉$ + $ \left\langle {1\bar{1}01} \right\rangle $ $〈1 \bar{1} 01〉$ exhibits superior intergranular compatibility, primarily due to more effective basal-to-basal slip transfer.