Ni-1C二元合金宏观不均匀塑性变形与断裂行为研究
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摘要
研究了Ni-1C二元合金宏观不均匀塑性变形与断裂行为。通过对拉伸应力-时间和位移-时间曲线测量,分析了Ni-1C合金波特文-勒夏特利埃(Portevin-Le-Chatelier,PLC)效应锯齿波形和应力跌幅分布特征,利用三维数字图像相关法研究PLC变形带的形核增殖、时空演化以及断裂过程中裂纹的形成和扩展。结果表明,在3mm/min拉伸速率下,Ni-1C合金PLC效应表现为A型锯齿波,应力跌幅呈现幂率分布;PLC变形带在试样的夹头或标距段形核,向试样一侧连续增殖传播;裂纹萌生于试样标距段,逐渐扩展,导致韧性断裂,同时裂纹的萌生及扩展与PLC变形带之间没有关联。
The macroscopic inhomogeneous plastic deformation and fracture behavior of Ni-1C binary alloy were investigated.The type of serrations of Portevin-Le-Chateller effect and distributions of the stress drop magnitude of the Ni-1C alloy were analyzed according to tensile stress-time and displacement-time curves.The nucleation,propagation,temporal and spatial evolution of PLC bands together with fracture process of Ni-1C alloy were investigated by using three-dimensional digital image correlation method.The results reveal that the PLC effect of Ni-1C alloy shows A type of serrations and the power-law function of the statistical distributions of the stress drop magintudes at a strain rate of 3 mm/min.PLC band forms at the grip or gauge positions and propagates continuously.The crack is initiated at the gauge length of the sample and expands gradually,leading to ductile fracture.There is no correlation between the initiation and propagation of the crack and the PLC bands.
The macroscopic inhomogeneous plastic deformation and fracture behavior of Ni-1C binary alloy were investigated.The type of serrations of Portevin-Le-Chateller effect and distributions of the stress drop magnitude of the Ni-1C alloy were analyzed according to tensile stress-time and displacement-time curves.The nucleation,propagation,temporal and spatial evolution of PLC bands together with fracture process of Ni-1C alloy were investigated by using three-dimensional digital image correlation method.The results reveal that the PLC effect of Ni-1C alloy shows A type of serrations and the power-law function of the statistical distributions of the stress drop magintudes at a strain rate of 3 mm/min.PLC band forms at the grip or gauge positions and propagates continuously.The crack is initiated at the gauge length of the sample and expands gradually,leading to ductile fracture.There is no correlation between the initiation and propagation of the crack and the PLC bands.
引文
[1]黄乾尧,李汉康.高温合金[M].北京:冶金工业出版社,2000.
[2]BEUKEL A V.Theory of the effect of dynamic strain aging on mechanical properties[J].Physica Status Solidi.,1975,A30(1):197-206.
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[9]CHIHAB K,ESTRIN Y,KUBIN L P,et al.The kinetics of the Portevin-Le Chatelier bands in an Al-5Mg alloy[J].Scripta Metallurgica,1987,21(2):203-208.
[10]RIZZI E,HHNER P.On the Portevin-Le Chatelier effect:Theoretical modeling and numerical results[J].International Journal of Plasticity,2004,20(1):121-165.
[11]LEBYODKIN M,BRECHET Y,ESTRIN Y,et al.Statistical behavior and strain localization patterns in the Portevin-Le Chatelier effect[J].Acta Materialia,1996,44(11):4 531-4 541.
[12]MIN J Y,LIN J P,SUN B.Effect of strain rate on spatio-temporal behavior of Portevin-Le Chatelier bands in a twinning induced plasticity steel[J].Mechanics of Materials,2014,68:164-175.
[13]ZAVATTIERI P D,SAVIC V,HECTOR JR L G,et al.Spatiotemporal characteristics of the Portevin-Le Chatelier effect in austenitic steel with twinning induced plasticity[J].International Journal of Plasticity,2009,25(12):2 298-2 330.
[14]XIANG G F,ZHANG Q C,LIU H W,et al.Time-resolved deformation measurements of the Portevin-Le Chatelier bands[J].Scripta Materialia,2007,56(8):721-724.
[2]BEUKEL A V.Theory of the effect of dynamic strain aging on mechanical properties[J].Physica Status Solidi.,1975,A30(1):197-206.
[3]RODRIGUEZ P.Serrated plastic flow[J].Bulletin of Materials Science,1984,6(4):653-663.
[4]COTTRELL A H.A note on the Portevin-Le Chatelier effect[J].Philosophical Magazine,1953,44(355):829-832.
[5]COTTRELL A H,JASWON M A.Distribution of solute atoms round a slow dislocation[J].Proceediings of the Royal Society,1949,A199(1 056):104-114.
[6]GOPINATH K,GOGIA A K,KAMAT S V,et al.Dynamic atrain ageing in Ni-base superalloy 720Li[J].Acta Materialia,2009,57(4):1 243-1 253.
[7]HAYES R W,HAYES W C.On the mechanism of delayed discontinuous plastic flow in an age-hardened nickel alloy[J].Acta Metallurgica,1982,30(7):1 295-1 301.
[8]HAYES R W.On a proposed theory for the disappearance of serrated flow in f.c.c.Ni alloys[J].Acta Metallurgica,1983,31(3):365-371.
[9]CHIHAB K,ESTRIN Y,KUBIN L P,et al.The kinetics of the Portevin-Le Chatelier bands in an Al-5Mg alloy[J].Scripta Metallurgica,1987,21(2):203-208.
[10]RIZZI E,HHNER P.On the Portevin-Le Chatelier effect:Theoretical modeling and numerical results[J].International Journal of Plasticity,2004,20(1):121-165.
[11]LEBYODKIN M,BRECHET Y,ESTRIN Y,et al.Statistical behavior and strain localization patterns in the Portevin-Le Chatelier effect[J].Acta Materialia,1996,44(11):4 531-4 541.
[12]MIN J Y,LIN J P,SUN B.Effect of strain rate on spatio-temporal behavior of Portevin-Le Chatelier bands in a twinning induced plasticity steel[J].Mechanics of Materials,2014,68:164-175.
[13]ZAVATTIERI P D,SAVIC V,HECTOR JR L G,et al.Spatiotemporal characteristics of the Portevin-Le Chatelier effect in austenitic steel with twinning induced plasticity[J].International Journal of Plasticity,2009,25(12):2 298-2 330.
[14]XIANG G F,ZHANG Q C,LIU H W,et al.Time-resolved deformation measurements of the Portevin-Le Chatelier bands[J].Scripta Materialia,2007,56(8):721-724.