脉冲强磁场处理对TC4钛合金显微组织及力学性能的影响

发布时间：2018-03-28 06:24

本文选题：TC钛合金　切入点：磁致塑性效应　出处：《中国有色金属学报》2015年02期

【摘要】：研究在脉冲强磁场处理条件下磁感应强度(B=2T、3T和4T)对TC4钛合金材料显微组织和力学性能的影响。结果表明:随着B值从2T增加到4T,α相体积分数从49%增加到59%,表明磁场诱发了从β到α的相变。经过磁场处理后,位错密度增加,当B=3T时,位错密度达到最大值,较未处理试样增加了4.8倍;当B=4T时,位错密度有所减小,这是由于磁致塑性效应和位错堆积效应共同作用的结果。经过磁场处理后,合金的强度提高了,当B=3T时,合金强度最高达到1330 MPa,较未处理试样的1236 MPa提高7.6%;当B=4T时,合金强度为1265 MPa,增幅2.3%,合金伸长率为15.66%,较处理前样品的伸长率提高4.8%,实现材料强度和塑性的同步提高,这与位错强化机制和α相的数量、分布和形貌有关。
[Abstract]:The effect of magnetic induction intensity on the microstructure and mechanical properties of TC4 titanium alloy was studied under the condition of pulsed strong magnetic field treatment. The results show that the volume fraction of 伪 phase increases from 49% to 59% with the increase of B value from 2T to 4T. The field induces the phase transition from 尾 to 伪. After the magnetic field treatment, The dislocation density increased, and the dislocation density reached the maximum at B3 T, which was 4.8 times higher than that of the untreated sample, and decreased at BX 4T. This is due to the combined effect of magnetoplastic effect and dislocation stacking effect. After magnetic treatment, the strength of the alloy increases, the maximum strength of the alloy reaches 1330 MPA at B3 T, which is 7.6 higher than that of the untreated sample at 1236 MPa, and when Bn4T is treated, The tensile strength of the alloy is 1265 MPA, the increase is 2.3%, and the elongation of the alloy is 15.66, which is 4.8% higher than that of the sample before treatment, and the strength and plasticity of the material are increased synchronously, which is related to the dislocation strengthening mechanism and the number, distribution and morphology of the 伪 phase.
【作者单位】：江苏大学材料科学与工程学院;
【基金】：国家自然科学基金资助项目(51371091,51001054,51174099) 江苏省自然科学基金资助项目(BK2011533)
【分类号】：TG146.23

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