(江蘇大學(xué) 材料科學(xué)與工程學(xué)院，鎮(zhèn)江 212013)
摘 要: 研究在脈沖強(qiáng)磁場處理?xiàng)l件下磁感應(yīng)強(qiáng)度(B=2T、3T和4T)對TC4鈦合金材料顯微組織和力學(xué)性能的影響。結(jié)果表明：隨著B值從2T增加到4T，α相體積分?jǐn)?shù)從49%增加到59%，表明磁場誘發(fā)了從β到α的相變。經(jīng)過磁場處理后，位錯密度增加，當(dāng)B=3T時，位錯密度達(dá)到最大值，較未處理試樣增加了4.8倍；當(dāng)B=4T時，位錯密度有所減小，這是由于磁致塑性效應(yīng)和位錯堆積效應(yīng)共同作用的結(jié)果。經(jīng)過磁場處理后，合金的強(qiáng)度提高了，當(dāng)B=3T時，合金強(qiáng)度最高達(dá)到1330 MPa，較未處理試樣的1236 MPa提高7.6%；當(dāng)B=4T時，合金強(qiáng)度為1265 MPa，增幅2.3%，合金伸長率為15.66%，較處理前樣品的伸長率提高4.8%，實(shí)現(xiàn)材料強(qiáng)度和塑性的同步提高，這與位錯強(qiáng)化機(jī)制和α相的數(shù)量、分布和形貌有關(guān)。
關(guān)鍵字: TC4鈦合金；磁致塑性效應(yīng)；脈沖強(qiáng)磁場；力學(xué)性能
（School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China）
Abstract:The effects of magnetic induced intensity (B=2T, 3T and 4T) on the microstructure and mechanical properties of TC4 titanium alloy in the condition of high pulsed magnetic field (HPMF) were investigated. The results show that the volume fraction of α phase increases from 49% to 59% when B increases from 2T to 4T, which demonstrates that the HPMF can induce the phase transformation from β to α phase. After the HPME treatment, the dislocation density increases. The dislocation density reaches a maximum when B=3T, which is added by 4.8 times compared to that without HPMF treatment. When B=4T, the dislocation density decreases a bit. The phenomenon is ascribed to the combined effects of magnetoplasticity and dislocation piles-up. Meanwhile, the tensile strength increases due to HPMF treatment. When B=3T, the tensile strength is 1330 MPa, which increases by 7.6% compared to that without treatment. When B=4T, the tensile strength and amplification are 1265 MPa and 2.3%, respectively. And the elongation is 15.66% which increases by 4.8% compared to that without treatment. Therefore, the strength and elongation increases synchronously, which is the result of dislocation strengthening mechanism and the amount, distribution and morphology of α phase.
Key words: TC4 titanium alloy; magnetoplasticity effect; high pulsed magnetic field; mechanical property
