电脉冲处理和等径角挤压对AZ31镁合金组织与性能的影响
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摘要
设计了一组ECAP和电脉冲处理实验来研究ECAP和电脉冲处理参数与AZ31镁合金微观组织演变之间的关系。对ECAP后的AZ31镁合金在室温下进行多道次轧制,然后通过高能电脉冲处理促进轧制后的AZ31镁合金的静态再结晶。通过分析电脉冲过程中合金体系内的能量变化和电脉冲的回复效应作用,揭示电脉冲促进再结晶过程的机理。结果表明:AZ31镁合金经过输出脉宽50μs、电流密度4.55×10~9A/m~2的电脉冲处理5 min后,样品晶粒尺寸从25μm减小到1.05μm,屈服强度和极限拉伸强度分别是316 MPa和425 MPa,伸长率为12.9%。
A set of ECAP and electropulsing treatment(EPT) experiments were designed to investigate the effect of ECAP and EPT parameters on the microstructure evolution and the mechanical properties of AZ31 Mg alloys. The ECAP-AZ31 Mg alloy was rolled multiple passes at room temperature, and then the static recrystallization of the rolled AZ31 alloy was accelerated by high-energy EPT. The Gibbs free energy change in the alloy system and the recovery effect of the EPT during this process were analyzed to reveal the recrystallization process of EPT. The results show that the grain size of AZ31 magnesium alloy decrease from 25 μm to 1.05 μm after 5 min pulse treatment with output pulse width of 50 μs and current density of 4.55 ×10~9 A/m~2. The yield strength and ultimate tensile strength are 316 MPa, 425 MPa, and the elongation is 12.9%, respectively.
A set of ECAP and electropulsing treatment(EPT) experiments were designed to investigate the effect of ECAP and EPT parameters on the microstructure evolution and the mechanical properties of AZ31 Mg alloys. The ECAP-AZ31 Mg alloy was rolled multiple passes at room temperature, and then the static recrystallization of the rolled AZ31 alloy was accelerated by high-energy EPT. The Gibbs free energy change in the alloy system and the recovery effect of the EPT during this process were analyzed to reveal the recrystallization process of EPT. The results show that the grain size of AZ31 magnesium alloy decrease from 25 μm to 1.05 μm after 5 min pulse treatment with output pulse width of 50 μs and current density of 4.55 ×10~9 A/m~2. The yield strength and ultimate tensile strength are 316 MPa, 425 MPa, and the elongation is 12.9%, respectively.
引文
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[3]屈伟平,高崧.镁合金的特点及应用现状[J].金属世界,2011,02):10-4.
[4]Suh J,Victoria-hern Ndez J,Letzig D,et al.Effect of processing route on texture and cold formability of AZ31 Mg alloy sheets processed by ECAP[J].Materials Science and Engineering:A,2016,669(159-70).
[5]Del Valle J A,Carre O F,Ruano O A.Influence of texture and grain size on work hardening and ductility in magnesium-based alloys processed by ECAP and rolling[J].Acta Materialia,2006,54(16):4247-59.
[6]Jiang Y,Guan L,Tang G,et al.Improved mechanical properties of Mg-9Al-1Zn alloy by the combination of aging,cold-rolling and electropulsing treatment[J].Journal of Alloys and Compounds,2015,626(297-303).
[7]Jiang Y,Guan L,Tang G,et al.Influence of electropulsing treatment on microstructure and mechanical properties of cold-rolled Mg-9Al-1Zn alloy strip[J].Materials Science and Engineering:A,2011,528(16-17):5627-35.
[8]Rahnama A,Qin R S.Electropulse-induced microstructural evolution in a ferritic-pearlitic 0.14%C steel[J].Scripta Materialia,2015,96(17-20).
[9]Cao F,Xia F,Hou H,et al.Effects of high-density pulse current on mechanical properties and microstructure in a rolled Mg-9.3Li-1.79Al-1.61Zn alloy[J].Materials Science and Engineering:A,2015,637(89-97).
[10]Ye X,Tse Z T H,Tang G,et al.RETRACTED:Effect of electroplastic rolling on deformability,mechanical property and microstructure evolution of Ti-6Al-4V alloy strip[J].Materials Characterization,2014,98(147-61).
[11]Gzyl M,Rosochowski A,Boczkal S,et al.The role of microstructure and texture in controlling mechanical properties of AZ31Bmagnesium alloy processed by I-ECAP[J].Materials Science and Engineering:A,2015,638(20-9).
[12]Su C W,Lu L,Lai M O.Mechanical behaviour and texture of annealed AZ31 Mg alloy deformed by ECAP[J].Materials Science and Technology,2013,23(3):290-6.
[13]XU Z H.Applied fundamental research of the high-density pulses on the processing of wrought magnesium alloy thin strip[J].2007,
[14]Parasnis A S.Dislocations in solids[J].Acta Crystallographica Section A:Foundations of Crystallography,1989,45(7):499-500.
[15]徐青.电脉冲作用下镁合金动态再结晶的机理研究[D].北京:清华大学,2011.
[16]Hu G,Shek C,Zhu Y,et al.Effect of electropulsing on recrystallization of Fe-3%Si alloy strip[J].Materials Transactions,2010,51(8):1390-4.
[17]Jiang Y,Tang G,Shek C,et al.On the thermodynamics and kinetics of electropulsing induced dissolution ofβ-Mg17Al12phase in an aged Mg-9Al-1Zn alloy[J].Acta Materialia,2009,57(16):4797-808.