温度对2297-T87铝锂合金拉伸性能的影响及不同温度拉伸后的显微组织
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摘要
对2297-T87铝锂合金在25～175℃下进行了拉伸试验,研究了温度对该合金拉伸性能的影响,观察了拉伸后的显微组织。结果表明:随着温度升高,合金的抗拉强度和屈服强度降低,伸长率增大;当温度升至175℃时,合金的抗拉强度和屈服强度为室温(25℃)时的77.72%和82.03%,合金仍具有较高的强度;在25～175℃拉伸后,合金的显微组织相似,均主要由轧制变形晶粒和少量细小再结晶晶粒组成。
Tensile tests at 25-175℃ were carried out on 2297-T87 Al-Li alloy.The effect of temperature on tensile property of the alloy were studied and the microtructures after tensile were observed.The results show that with the increase of temperature,the tensile strength and yield strength of the alloy decreased,and the elongation increased.When the temperature rose to 175 ℃,the tensile strength and yield strength of the alloy were 77.72% and 82.03% of the tensile strength and yield strength at room temperature(25℃),and the alloy still had relatively high strength.The microstructures of the alloys were similar,and they were mainly composed of rolling deformed grains and a small amount of fine recrystallized grains.
Tensile tests at 25-175℃ were carried out on 2297-T87 Al-Li alloy.The effect of temperature on tensile property of the alloy were studied and the microtructures after tensile were observed.The results show that with the increase of temperature,the tensile strength and yield strength of the alloy decreased,and the elongation increased.When the temperature rose to 175 ℃,the tensile strength and yield strength of the alloy were 77.72% and 82.03% of the tensile strength and yield strength at room temperature(25℃),and the alloy still had relatively high strength.The microstructures of the alloys were similar,and they were mainly composed of rolling deformed grains and a small amount of fine recrystallized grains.
引文
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[8]YANG S L,SHEN J,YAN X D,et al.Homogenization treatment parameter optimization and microstructural evolution of Al-Cu-Li alloy[J].Rare Metal Materials and Engineering,2017,46(1):28-34.
[9]黄敏,陈轶,李超,等.7A12-T7352铝合金高温力学性能及断裂行为研究[J].航空材料学报,2014,34(1):82-85.
[10]王海,魏芬绒,邓家彬,等.影响钛合金屈强比的因素及作用机理探讨[J].热加工工艺,2016,45(22):109-111.
[11]伊琳娜,李国爱,王亮,等.7D04-T7451铝合金高温性能及组织变化特征[J].轻合金加工技术,2017,45(10):61-66.
[12]姚学峰,付立铭,单爱党.大变形热轧制备超细晶TC4钛合金的组织与性能[J].机械工程材料,2018,42(3):57-61,66.
[13]TSIVOULAS D,ROBSON J D,SIGLI C,et al.Interactions between zirconium and manganese dispersoid-forming elements on their combined addition in Al-Cu-Li alloys[J].Acta Materialia,2012,60(13/14):5245-5259.
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[15]LIN Y,LU C G,WEI C Y,et al.Effect of aging treatment on microstructures,tensile properties and intergranular corrosion behavior of Al-Cu-Li alloy[J].Materials Characterization,2018,141:163-168.
[16]马云龙,李劲风,刘观日,等.重固溶-不同温度T8再时效2195铝锂合金的力学性能与显微组织演化[J].中国有色金属学报,2017,27(2):234-242.
[17]ZHANG S F,ZENG W D,YANG W H,et al.Ageing response of a Al-Cu-Li 2198alloy[J].Materials&Design,2014,63(2):368-374.
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