<p>TA36 is a novel low-cost near-α titanium alloy independently developed in China, but it is prone to cracking during cold working. This study revealed the deformation behavior and crack nucleation mechanism during the cold deformation process of TA36 lamellar structure through in-situ tensile tests combined with in-situ EBSD technology. The research found that after cold deformation of the TA36 lamellar structure, numerous GNDs were formed at the grain boundaries and within the grains where no slip lines appeared, and GNDs further hindered the slip process. Due to the anisotropy of the coarse lamellar structure, it is not conducive to the initiation of the base plane and prismatic slip systems. The activated slip systems are mainly pyramidal slip systems (01 <InlineEquation ID="IEq1"> <EquationSource Format="TEX">$\stackrel{\text{-}}{1}$</EquationSource> <EquationSource Format="MATHML"><math> <mover> <mn>1</mn> <mtext>-</mtext> </mover> </math></EquationSource> </InlineEquation> 1)[<InlineEquation ID="IEq2"> <EquationSource Format="TEX">$\stackrel{\text{-}}{2}$</EquationSource> <EquationSource Format="MATHML"><math> <mover> <mn>2</mn> <mtext>-</mtext> </mover> </math></EquationSource> </InlineEquation> 110], (10 <InlineEquation ID="IEq3"> <EquationSource Format="TEX">$\stackrel{\text{-}}{1}$</EquationSource> <EquationSource Format="MATHML"><math> <mover> <mn>1</mn> <mtext>-</mtext> </mover> </math></EquationSource> </InlineEquation> 1)[1 <InlineEquation ID="IEq4"> <EquationSource Format="TEX">$\stackrel{\text{-}}{2}$</EquationSource> <EquationSource Format="MATHML"><math> <mover> <mn>2</mn> <mtext>-</mtext> </mover> </math></EquationSource> </InlineEquation> 10] and (<InlineEquation ID="IEq5"> <EquationSource Format="TEX">$\stackrel{\text{-}}{1}$</EquationSource> <EquationSource Format="MATHML"><math> <mover> <mn>1</mn> <mtext>-</mtext> </mover> </math></EquationSource> </InlineEquation> 10 <InlineEquation ID="IEq6"> <EquationSource Format="TEX">$\stackrel{\text{-}}{1}$</EquationSource> <EquationSource Format="MATHML"><math> <mover> <mn>1</mn> <mtext>-</mtext> </mover> </math></EquationSource> </InlineEquation>)[11 <InlineEquation ID="IEq7"> <EquationSource Format="TEX">$\stackrel{\text{-}}{2}$</EquationSource> <EquationSource Format="MATHML"><math> <mover> <mn>2</mn> <mtext>-</mtext> </mover> </math></EquationSource> </InlineEquation> 0], with only a small number of prismatic slip systems (01 <InlineEquation ID="IEq8"> <EquationSource Format="TEX">$\stackrel{\text{-}}{1}$</EquationSource> <EquationSource Format="MATHML"><math> <mover> <mn>1</mn> <mtext>-</mtext> </mover> </math></EquationSource> </InlineEquation> 0)[1 <InlineEquation ID="IEq9"> <EquationSource Format="TEX">$\stackrel{\text{-}}{2}$</EquationSource> <EquationSource Format="MATHML"><math> <mover> <mn>2</mn> <mtext>-</mtext> </mover> </math></EquationSource> </InlineEquation> 10] activated. Cracks originated at the intersection of trigeminal grain boundaries and the slip zones where stress concentration was relatively severe, and then quasi-cleavage fractures occurred.</p>

In-situ investigation of room-temperature tensile deformation behavior in low-cost TA36 titanium alloy with lamellar microstructure

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发表日期：

2026年3月1日

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Jike Deng,
Wei Wang,
Yan Hou,
Xiongxiong Gao,
Shewei Xin,
Cheng Wang

摘要

TA36 is a novel low-cost near-α titanium alloy independently developed in China, but it is prone to cracking during cold working. This study revealed the deformation behavior and crack nucleation mechanism during the cold deformation process of TA36 lamellar structure through in-situ tensile tests combined with in-situ EBSD technology. The research found that after cold deformation of the TA36 lamellar structure, numerous GNDs were formed at the grain boundaries and within the grains where no slip lines appeared, and GNDs further hindered the slip process. Due to the anisotropy of the coarse lamellar structure, it is not conducive to the initiation of the base plane and prismatic slip systems. The activated slip systems are mainly pyramidal slip systems (01 $\stackrel{\text{-}}{1}$ $\bar{1}$ 1)[ $\stackrel{\text{-}}{2}$ $\bar{2}$ 110], (10 $\stackrel{\text{-}}{1}$ $\bar{1}$ 1)[1 $\stackrel{\text{-}}{2}$ $\bar{2}$ 10] and ( $\stackrel{\text{-}}{1}$ $\bar{1}$ 10 $\stackrel{\text{-}}{1}$ $\bar{1}$ )[11 $\stackrel{\text{-}}{2}$ $\bar{2}$ 0], with only a small number of prismatic slip systems (01 $\stackrel{\text{-}}{1}$ $\bar{1}$ 0)[1 $\stackrel{\text{-}}{2}$ $\bar{2}$ 10] activated. Cracks originated at the intersection of trigeminal grain boundaries and the slip zones where stress concentration was relatively severe, and then quasi-cleavage fractures occurred.