TA1钛合金板材单向拉伸力学性能及各向异性研究

Study on unidirectional tensile mechanical properties and anisotropy of TA1 titanium alloy sheet

摘要

为探究TA1钛合金板材室温成形性能，采用单向拉伸试验系统研究了加载速度（1、3、5 mm/min）和取向角度（0°、45°、90°）对1 mm厚TA1板材力学性能的影响规律。结果表明：加载速度从1 mm/min增至5 mm/min时，0°方向变形量从48.92%降至40.31%，屈服强度从218.4 MPa降至196.9 MPa，呈现明显的应变速率敏感性；不同取向表现出显著各向异性，45°方向塑性最优（变形量51.85%）但强度最低（抗拉强度295.8 MPa），90°方向强度最高（屈服强度271.3 MPa）但塑性最差（变形量43.23%）。研究揭示了TA1板材各向异性与加载速度的耦合效应，为其室温成形工艺参数优化提供了理论依据。

Abstract

To investigate the room-temperature forming properties of TA1 titanium alloy sheets, a unidirectional tensile testing system was employed to study the effects of loading speed (1, 3, 5 mm/min) and orientation angle (0°, 45°, 90°) on the mechanical performance of 1 mm thick TA1 sheets. Results showed that as loading speed increased from 1 mm/min to 5 mm/min, the 0° deformation decreased from 48.92% to 40.31%, while yield strength dropped from 218.4 MPa to 196.9 MPa, demonstrating significant strain rate sensitivity. Different orientations exhibited distinct anisotropy: the 45° orientation showed optimal plasticity (deformation 51.85%) but lowest strength (tensile strength 295.8 MPa), whereas the 90° orientation had highest strength (yield strength 271.3 MPa) but poorest plasticity (deformation 43.23%). This study revealed the coupled effect between TA1 sheet anisotropy and loading speed, providing a theoretical basis for optimizing room-temperature forming process parameters.

关键词

TA1钛合金 / 单向拉伸 / 各向异性 / 加载速度 / 力学性能

Key words

TA1 titanium alloy / unidirectional tensile / anisotropy / loading speed / mechanical properties

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