160°大角度等通道转角挤压AZ61组织演化与力学性能
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摘要
在100℃及150℃对商用AZ61挤压板材采用160°大角度等通道转角挤压,分析了等通道转角挤压(ECAP)变形组织演化规律。基于储能理论分析了100℃和150℃时ECAP对AZ61合金力学性能的影响。结果表明,在100℃时,ECAP三道次累积变形量为0.6,以孪晶动态再结晶(TDRX)为主;在150℃累积变形量为0.6时,以连续动态再结晶(CDRX)为主。150℃的ECAP挤压8道次,再经100℃的ECAP挤压三道次,获得了1μm的细晶组织,提高了AZ61合金的综合力学性能,其屈服强度达到350 MPa,抗拉强度达到了432 MPa。
The evolution of deformation microstructure was analyzed by equal channel 160° angle extrusion(ECAP) at100 ℃ and 150 ℃ for commercial AZ61 extrusion plate. Based on the energy storage theory analyzed the at 100 ℃ and150 ℃ when the ECAP effects on mechanical properties of AZ61 alloy. The results show that at 100 ℃, ECAP three times accumulated deformation is 0.6, twin dynamic recrystallization(TDRX) is given priority; At 150 ℃ accumulated deformation of 0.6, the continuous dynamic recrystallization(CDRX) is the main priority. 150 ℃ of ECAP extrusion 8 times, then through 100 ℃ of ECAP extrusion three times, the 1 μm fine grain structure is obtained, improve the comprehensive mechanics performance of the AZ61 alloy, the yield strength and tensile strength are 350 MPa and 432 MPa,respectively.
The evolution of deformation microstructure was analyzed by equal channel 160° angle extrusion(ECAP) at100 ℃ and 150 ℃ for commercial AZ61 extrusion plate. Based on the energy storage theory analyzed the at 100 ℃ and150 ℃ when the ECAP effects on mechanical properties of AZ61 alloy. The results show that at 100 ℃, ECAP three times accumulated deformation is 0.6, twin dynamic recrystallization(TDRX) is given priority; At 150 ℃ accumulated deformation of 0.6, the continuous dynamic recrystallization(CDRX) is the main priority. 150 ℃ of ECAP extrusion 8 times, then through 100 ℃ of ECAP extrusion three times, the 1 μm fine grain structure is obtained, improve the comprehensive mechanics performance of the AZ61 alloy, the yield strength and tensile strength are 350 MPa and 432 MPa,respectively.
引文
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[3]Guo L L,Fujita F.Effect of deformation mode,dynamic recrystallization and twinning on rolling texture evolution of AZ31 magnesium alloys[J].Transactions of Nonferrous Metals Society of China,2018,28(6):1094-1102.
[4]Huang T L,Shuai L F,Wakeel A,et al.Strengthening mechanisms and Hall-Petch stress of ultrafine grained Al-0.3%Cu[J].Acta Materialia,2018,156:369-378.
[5]陈振华,严红革.镁合金[M].北京:化学工业出版社,2004.
[6]Fan H,Aubry S,Arsenlis A,et al.Grain size effects on dislocation and twinning mediated plasticity in magnesium[J].Scripta Materialia,2016,112:50-53.
[7]Azushima A,Kopp R,Korhonen A,et al.Severe plastic deformation(SPD)processes for metals[J].CIRP Annals,2008,57(2):716-735.
[8]Martynenko N S,Lukyanova E A,Serebryany V N,et al.Increasing strength and ductility of magnesium alloy WE43 by equal-channel angular pressing[J].Materials Science and Engineering:A,2018,712:625-629.
[9]Lukyanova E A,Martynenko N S,Shakhova I,et al.Strengthening of age-hardenable WE43 magnesium alloy processed by high pressure torsion[J].Materials Letters,2016,170:5-9.
[10]Hou L,Wang T Z,Wu R Z,et al.Microstructure and mechanical properties of Mg-5Li-1Al sheets prepared by accumulative roll bonding[J].Journal of Materials Science&Technology,2018,34(2):317-323.
[11]Zhao G,Fan J F,Zhang H,et al.Exceptional mechanical properties of ultra-fine grain AZ31 alloy by the combined processing of E-CAP,rolling and EPT[J].Materials Science and Engineering:A,2018,731:54-60.
[12]Iwahashi Y.Principle of Equal-Channel Angular Peessing for the Processing of Ultra-Fine Grained Materials[M].City,1996.
[13]Chen Y J,Wang Q D,Lin J B,et al.Grain refinement of magnesium alloys processed by severe plastic deformation[J].Transactions of Nonferrous Metals Society of China,2014,24(12):3747-3754.
[14]刘俊伟,陈振华,陈鼎.AZ31镁合金挤压板材的中温变形机理及软化机制[J].中国有色金属学报(英文版),2012,22(6):1329-1335.
[15]何运斌,潘清林,刘晓艳.镁合金等通道转角挤压过程中的晶粒细化机制[J].中国有色金属学报,2011(8):1785-1793.
[16]Barnett M R.Twinning and the ductility of magnesium alloys:Part I:“Tension”twins[J].Materials Science and Engineering:A,2007,464(1):1-7.
[17]Robin P Y F,Cruden A R.Strain and vorticity patterns in ideally ductile transpression zones[J].Journal of Structural Geology,1994,16(4):447-466.
[18]Godfrey A,Cao W Q,Liu Q,et al.Stored energy,microstructure,and flow stress of deformed metals[J].Metallurgical and Materials Transactions A,2005,36(9):2371-2378.
[19]Azzeddine H,Tirsatine K,Baudin T,et al.On the stored energy evolution after accumulative roll-bonding of invar alloy[J].Materials Chemistry and Physics,2017,201:408-415.