室温Φ=120°等径弯曲通道变形工业纯钛的力学性能

Mechanical properties of commercial pure titanium processed by ECAP at room temperature using a 120° die

  • 摘要: 采用模角Φ=120°的模具,以BC方式(两次挤压道次之间试样绕纵轴沿同一方向转动90°进行下一道次挤压)在室温下成功实现了工业纯钛8道次等径弯曲通道变形(ECAP),对挤压过程中各道次试样的微观结构及性能进行了分析测试.结果表明:工业纯钛经8道次ECAP变形后,抗拉强度由407 MPa升高到791 MPa;显微硬度由1 588 MPa升高到2 641 MPa;并保持良好的塑性,伸长率为19%.

     

    Abstract: Eight-pass equal channel angular pressing (ECAP) at room temperature was successfully carried out on commercial pure Ti via route Bc, in which the samples were rotated by 90° along the vertical axis in the same direction between two extrusion passes, at an angle φ of 1200°. The microstructure and mechanical properties of the samples after different pressing passes were analyzed and tested. The results showed that after eight-pass ECAP, the tensile strength increased from 407 MPa to 791 MPa, the microhardness increased from 1 588 MPa to 2 641 MPa. the plasticity maintained well, and the elongation reached to 19%.

     

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