Influence of high pulsed magnetic field on tensile properties of TC4 alloy

• 来源期刊: 中国物理B（英文版）
• 关键词: TC4 titanium alloy tensile properties microstructure magneto-plasticity effect
• 年，卷（期）: 2017,（4）
• 页码范围: 293-300
• 页数: 8页
• 语种: 英文
• DOI: 10.1088/1674-1056/26/4/046201

摘要

The tensile tests of TC4 alloy are carried on electronic universal testing machine in the synchronous presence of high pulsed magnetic field (HPMF) parallel to the axial direction.The effects of magnetic induction intensity (B =0,1 T,3 T,and 5 T) on elongation (δ) of TC4 alloy are investigated.At 3 T,the elongation arrives at a maximum value of 12.41％,which is enhanced by 23.98％ in comparison with that of initial sample.The elongation curve shows that 3 T is a critical point.With B increasing,the volume fraction of α phase is enhanced from 49.7％ to 55.9％,which demonstrates that the HPMF can induce the phase transformation fromβ phase to α phase.Furthermore,the magnetic field not only promotes the orientation preference of crystal plane along the slipping direction,but also has the effect on increasing the dislocation density.The dislocation density increases with the enhancement of magnetic induction intensity and the 3-T parameter is ascertained as a turning point from increase to decrease tendency.When B is larger than 3 T,the dislocation density decreases with the enhancement of B.The influence of magnetic field is analyzed on the basis of magneto-plasticity effect.The high magnetic field will enhance the dislocation strain energy and promote the state conversion of radical pair generated between the dislocation and obstacles from singlet into triplet state,in which is analyzed the phenomenon that the dislocation density is at an utmost with B =3 T.Finally,the inevitability of optimized 3-T parameter is further discussed on a quantum scale.