摘要
对6061铝合金板进行了高温拉伸实验,研究了不同拉伸温度和应变速率对其微观组织和力学性能的影响。结果表明,拉伸温度350℃时,微观结构中出现细小的再结晶晶粒。6061铝合金组织中强化相的数目与应变速率有关,拉伸温度250℃时,随着应变速率的减小,第二相粒子数目减少。在恒定的应变速率下,6061铝合金的抗拉强度随着拉伸温度的升高而下降;在恒定的拉伸温度下,铝合金的抗拉强度随着应变速率的升高而上升。在温度为350℃,应变速率为10^(-3)s^(-1)时,断后伸长率最大,为50.35%,最低抗拉强度为51 MPa。6061铝合金断口出现大量韧窝,形貌为韧性断裂。随着拉伸温度的升高和应变速率的减小,断口中韧窝比较密集,深度较深,塑性较好。应变速率的减小和变形温度的升高会提升材料的塑性。
The high-temperature tensile test of 6061 aluminum alloy sheet was carried out,and the effects of different tensile temperatures and strain rates on its microstructure and mechanical properties were studied.The results show that at a tensile temperature of 350'C,fine recrystallised grains appear in the microstructure.The number of reinforcing phases in the 6061 aluminum alloy microstructure is related to the strain rate.At a tensile temperature of 250℃,the number of second-phase particles decreases as the strain rate decreases.At a constant strain rate,the tensile strength of the 6061 aluminum alloy decreases with the increase of the tensile temperature;at a constant tensile temperature,the tensile strength of the aluminum alloy rises with the increase of strain rate.At a temperature of 350℃and a strain rate of 10^(-3)s^(-1),the maximum elongation after break is 50.35%and the minimum tensile strength is 51 MPa.6061 aluminum alloy fracture has a large number of dimples,the morphology is toughness fracture.With the increase of tensile temperature and the decrease of strain rate,the fracture has more dense density,deep depther,and better plasticity.Reduced strain rate and increasing deformation temperature can enhance material plasticity.
作者
邓云飞
李兵
张鹏
王敏
DENG Yunfei;LI Bing;ZHANG Peng;WANG Min(School of Materials Science and Engineering,Hubei University of Automotive Industry,Shiyan 442002,China)
出处
《热加工工艺》
北大核心
2023年第13期24-27,32,共5页
Hot Working Technology
基金
国家自然科学基金资助项目(51001049)
湖北省重点研发计划项目(2021BAB019)。
关键词
高温拉伸性能
6061铝合金
显微组织
力学性能
high temperature tensile property
6061 aluminum alloy
microstructure
mechanical properties
