不同热处理状态Al-3.5Mg-0.2Sc合金的动态应变时效行为
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摘要
在不同循环频率下对Al-3.5Mg-0.2Sc合金进行室温低周疲劳实验,研究固溶态和固溶+时效态Al-3.5Mg-0.2Sc合金在低周疲劳加载条件下的动态应变时效行为。结果表明:固溶态和固溶+时效态合金在室温低周疲劳过程中可发生动态应变时效,且动态应变时效行为主要受循环频率和热处理的影响;当循环频率为1.0 Hz、0.5 Hz时,在固溶态和固溶+时效态合金不同周次的循环滞后回线上拉伸和压缩加载部分均可观察到C型锯齿状波动;对比合金的循环应力最大跌落值可知,随着循环频率的降低,合金的动态应变时效行为减弱直至消失;当循环频率相同时,固溶+时效态合金的动态应变时效程度始终高于固溶态合金。
Low cycle fatigue test of Al-3. 5 Mg-0. 2 Sc alloy at room temperature was carried out at different cycle frequencies,and the dynamic strain aging behavior of the solid-solution and solution-aged Al-3. 5 Mg-0. 2 Sc alloy under low cycle fatigue loading was investigated. The results indicate that the dynamic strain aging of the solid-solution and solution-aged Al-3. 5 Mg-0. 2 Sc alloy occurs during low cycle fatigue at room temperature,and the dynamic strain aging behavior is mainly affected by cycle frequency and heat treatment.When the cyclic frequency is 0. 5 Hz and 1. 0 Hz,the type C of serration wave can be observed on the cyclic hysteresis loops of the solidsolution and solution-aged Al-3. 5 Mg-0. 2 Sc alloy at different cycles. Compared with the maximum drop value of cyclic stress,the dynamic strain aging behavior of the alloy decreases and disappears with the decreasing of cycle frequency,and when the cycle frequency is the same,the dynamic strain aging degree of the solution-aged alloy is always higher than that of solid-solution alloy.
Low cycle fatigue test of Al-3. 5 Mg-0. 2 Sc alloy at room temperature was carried out at different cycle frequencies,and the dynamic strain aging behavior of the solid-solution and solution-aged Al-3. 5 Mg-0. 2 Sc alloy under low cycle fatigue loading was investigated. The results indicate that the dynamic strain aging of the solid-solution and solution-aged Al-3. 5 Mg-0. 2 Sc alloy occurs during low cycle fatigue at room temperature,and the dynamic strain aging behavior is mainly affected by cycle frequency and heat treatment.When the cyclic frequency is 0. 5 Hz and 1. 0 Hz,the type C of serration wave can be observed on the cyclic hysteresis loops of the solidsolution and solution-aged Al-3. 5 Mg-0. 2 Sc alloy at different cycles. Compared with the maximum drop value of cyclic stress,the dynamic strain aging behavior of the alloy decreases and disappears with the decreasing of cycle frequency,and when the cycle frequency is the same,the dynamic strain aging degree of the solution-aged alloy is always higher than that of solid-solution alloy.
引文
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[2]Chen L J,Li J,Li F,et al.Dynamic strain aging induced by cyclic deformation in two magnesium alloys[J].Advanced Materials Research,2011,299-300:90-93.
[3]彭广威,甘雪萍.Cu-15Ni-8Sn合金压缩变形下的动态时效行为[J].金属热处理,2017,42(5):74-77.PENG Guang-wei,GAN Xue-ping.Dynamic aging behavior of Cu-15Ni-8Sn alloy under compression[J].Heat Treatment of Metals,2017,42(5):74-77.
[4]Lin Y H,Hu K H,Kao F H,et al.Dynamic strain aging in low cycle fatigue of duplex titanium alloys[J].Materials Science and Engineering A,2011,528:4381-4389.
[5]魏银苹,吴素君,罗帅.动态应变时效处理对SA508-Ⅲ钢组织性能的影响[J].材料热处理学报,2013,34(10):90-95.WEI Yin-ping,WU Su-jun,LUO Shuai.Effect of dynamic strain aging on microstructure and microhardness of VSA508-Ⅲsteel[J].Transactions of Materials and Heat Treatment,2013,34(10):90-95.
[6]孙延安,李春福,鲁亮,等.动态应变时效对35Cr Mo钢力学性能的影响[J].热加工工艺,2011,40(22):169-171.SUN Yan-an,LI Chun-fu,LU Liang,et al.Effects of dynamic strain aging on mechanical properties of 35Cr Mo steel[J].Hot Working Technology,2011,40(22):169-171.
[7]Luo S,Wu S.Effect of dynamic strain aging on the microstructure and mechanical properties of a reactor pressure vessel steel[J]Materials Science and Engineering A,2014,596:25-31.
[8]Das A R,Chowdhury T,Sivaprasad S,et al.Influence of dynamic strain ageing on fracture behaviour and stretch zone formation of a reactor pressure vessel steel[J].International Journal of Fracture,2016,202(1):79-91.
[9]钱匡武,李效琦,萧林钢,等.金属和合金中的动态应变时效现象[J].福州大学学报(自然科学版),2001,29(6):8-23.QIAN Kuang-wu,LI Xiao-qi,XIAO Lin-gang,et al.Dynamic strain aging of the metals and alloys[J].Journal of Fuzhou University(Natural Science),2001,29(6):8-23.
[10]Wen W,Morris J G.An investigation of serrated yielding in 5000 series aluminum alloys[J].Materials Science and Engineering A,2003,354:279-285.
[11]Dierke H,Krawehl F,Graff S,et al.Portevin-Le Chatelier effect in Al-Mg alloys:Influence of obstacles-experiments and modeling[J].Computational Materials Science,2007,39(1):106-112.
[12]Valdes-Tabernero M A,Sancho-Cadenas R,Sabirov I,et al.Effect of SPD processing on mechanical behavior and dynamic strain aging of an Al-Mg alloy in various deformation modes and wide strain rate range[J].Materials Science and Engineering A,2017,696:348-359.
[13]周宁.铝镁合金Portevin-Le Chatelier效应的影响因素分析[J].安徽化工,2014,40(4):49-51.ZHOU Ning.Study on the influencing factors of Portevin-Le Chatelier effect in Al-Mg alloys[J].Anhui Chemical Industry,2014,40(4):49-51.
[14]符师桦,蔡玉龙,张青川,等.自然时效对6061铝合金锯齿形屈服的影响[J].稀有金属材料与工程,2017,46(12):3728-3732.FU Shi-hua,CAI Yu-long,ZHANG Qing-chuan,et al.Influence of natural aging on serrated yielding of 6061 Al-based alloy[J].Rare Metal Materials and Engineering,2017,46(12):3728-3732.
[15]鲁家瑞,朱鹏程,沈寅忠.11Cr3W3Co钢在不同温度下拉伸时的锯齿流变行为[J].机械工程材料,2017,41(3):13-18.LU Jia-rui,ZHU Peng-cheng,SHEN Yin-zhong.Serrated flow behavior of 11Cr3W3Co steel during tension at different temperatures[J].Materials for Mechanical Engineering,2017,41(3):13-18.
[16]金丹,李江华,田大将.316L不锈钢单轴疲劳动态应变的时效分析[J].材料研究学报,2016,30(7):496-502.JIN Dan,LI Jiang-hua,TIAN Da-jiang.Dynamic strain aging of 316L stainless steel during uniaxial fatigue process at 600℃[J].Chinese Journal of Materials Research,2016,30(7):496-502.
[17]Rodriguez P.Serrated plastic flow[J].Bulletin of Materials Science,1984,6(4):653-663.
[18]Fu S H,Cheng T,Zhang Q C,et al.Two mechanisms for the normal and inverse behaviors of the critical strain for the Protevin-Le Chatelier effect[J].Acta Materialia,2012,60(19):6650-6656.
[19]陈立佳,王靓亮,王宝森.Incoloy 825镍基合金的低周疲劳行为[J].沈阳工业大学学报,2017,39(4):371-377.CHEN Li-jia,WANG Liang-liang,WANG Bao-sen.Low-cycle fatigue behavior of Incoloy 825 nickel-based alloy[J].Journal of Shenyang University of Technology,2017,39(4):371-377.
[20]郑红梅,胡学飞,崔接武,等.添加Sc元素后Al-Mg合金的性能和结构变化[J].材料热处理学报,2016,37(11):45-49.ZHENG Hong-mei,HU Xue-fei,CUI Jie-wu,et al.Performance and structure of Al-Mg alloys doped with Sc[J].Transactions of Materials and Heat Treatment,2016,37(11):45-49.
[21]林娜,杨开怀,陈文哲.析出相对AZ91D挤压镁合金PLC效应的影响[J].材料热处理学报,2016,37(2):25-30.LIN Na,YANG Kai-huai,CHEN Wen-zhe.Influence of precipitation on PLC effect of AZ91D pressed magnesium alloy[J].Transactions of Materials and Heat Treatment,2016,37(2):25-30.