<p>Two-layer and three-layer TC4/TA2 titanium alloy composite plates with different thickness ratios were successfully fabricated using a vacuum rolling process. The influence of the layer thickness ratio on the mechanical properties, back stress strengthening, fracture behavior, and coordinated deformation of the TC4/TA2 composite plates was investigated. The results indicate that with an increasing proportion of TA2, the elongation of the three-layer composite plates gradually increases, whereas the elongation of the two-layer composite plates first increases and then decreases. For the three-layer composite plates, the TA2/TC4/TA2 configuration is found to be superior to the TC4/TA2/TC4 configuration, with a maximum elongation of about 17.4%. During tensile deformation, a higher proportion of the TA2 layer leads to a greater number of TC4 grains with < 0001 > orientation. During compressive deformation, with an increasing proportion of TA2, the < 0001 > orientation tends to align parallel to the compression direction, and the <InlineEquation ID="IEq1"> <EquationSource Format="TEX">$< 10\overline{1}0 >$</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mo><</mo> <mn>10</mn> <mover> <mn>1</mn> <mo>¯</mo> </mover> <mn>0</mn> <mo>></mo> </mrow> </math></EquationSource> </InlineEquation> and <InlineEquation ID="IEq2"> <EquationSource Format="TEX">$< 11\overline{2}0 >$</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mo><</mo> <mn>11</mn> <mover> <mn>2</mn> <mo>¯</mo> </mover> <mn>0</mn> <mo>></mo> </mrow> </math></EquationSource> </InlineEquation> orientations gradually exhibit a banded distribution. As the proportion of TA2 increases, the composite plates exhibit greater back stress strengthening, and the buffering effect of the interface on TC4 increases in TC4/TA2 compression specimens. The fracture process of the three-layer composite plates with a TC4/TA2/TC4 configuration during tensile deformation is the same as that of the two-layer plates: cracks first initiate on the free surface of TC4 and then propagate through the interface into TA2.</p>

The influence of layer thickness ratio on the mechanical properties and coordinated deformation of TC4/TA2 titanium alloy composite plate

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发表日期：

2026年4月1日

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Zhanrui Wang,
Xin Guan,
Yupeng Zhang,
Haijun Wang,
Hui Yu

摘要

Two-layer and three-layer TC4/TA2 titanium alloy composite plates with different thickness ratios were successfully fabricated using a vacuum rolling process. The influence of the layer thickness ratio on the mechanical properties, back stress strengthening, fracture behavior, and coordinated deformation of the TC4/TA2 composite plates was investigated. The results indicate that with an increasing proportion of TA2, the elongation of the three-layer composite plates gradually increases, whereas the elongation of the two-layer composite plates first increases and then decreases. For the three-layer composite plates, the TA2/TC4/TA2 configuration is found to be superior to the TC4/TA2/TC4 configuration, with a maximum elongation of about 17.4%. During tensile deformation, a higher proportion of the TA2 layer leads to a greater number of TC4 grains with < 0001 > orientation. During compressive deformation, with an increasing proportion of TA2, the < 0001 > orientation tends to align parallel to the compression direction, and the $< 10\overline{1}0 >$ $< 10 \bar{1} 0 >$ and $< 11\overline{2}0 >$ $< 11 \bar{2} 0 >$ orientations gradually exhibit a banded distribution. As the proportion of TA2 increases, the composite plates exhibit greater back stress strengthening, and the buffering effect of the interface on TC4 increases in TC4/TA2 compression specimens. The fracture process of the three-layer composite plates with a TC4/TA2/TC4 configuration during tensile deformation is the same as that of the two-layer plates: cracks first initiate on the free surface of TC4 and then propagate through the interface into TA2.