高强度织构对2524铝合金疲劳性能的影响

发布时间：2018-03-05 16:21

本文选题：铝合金　切入点：高斯织构　出处：《粉末冶金材料科学与工程》2017年03期 　论文类型：期刊论文

【摘要】：对分别含有高强度高斯织构和高强度立方织构状态的2种2524-T4铝合金板材的疲劳裂纹扩展速率和短裂纹扩展行为进行研究,用扫描电镜(SEM)观察疲劳试样断口形貌和疲劳短裂纹的扩展路径,研究织构类型对合金疲劳性能的影响。结果表明:高斯取向晶粒能够提高材料疲劳裂纹扩展的门槛值及增强疲劳裂纹的扩展抗力,使材料在更高的应力强度因子下发生失稳扩展;而高强度立方织构对疲劳性能的影响相对较小。在近门槛区,高斯晶粒通过裂纹偏转的形式有效阻碍短裂纹扩展,在稳态扩展区,高斯晶粒能明显降低疲劳裂纹的扩展速率,高斯织构还能延长合金疲劳裂纹稳态的扩展区,提高合金的疲劳损伤容限。因此,高强度高斯织构的2524-T4铝合金板材比立方织构的合金具有更好的疲劳性能。
[Abstract]:The fatigue crack growth rate and short crack propagation behavior of two kinds of 2524-T4 aluminum alloy sheets with high strength Gao Si texture and high strength cubic texture are studied. The fracture morphology of fatigue specimen and the propagation path of short fatigue crack were observed by scanning electron microscope (SEM). The effects of texture types on fatigue properties of alloys are studied. The results show that Gao Si oriented grains can increase the threshold value of fatigue crack growth and enhance the resistance of fatigue crack propagation. In the near threshold region, Gao Si grain effectively hinders the short crack propagation through the form of crack deflection, while the effect of high strength cubic texture on fatigue properties is relatively small. In the steady state growth zone, Gao Si grain can obviously reduce the fatigue crack growth rate, and Gao Si texture can also prolong the steady state growth zone of fatigue crack of alloy and increase the fatigue damage tolerance of alloy. The 2524-T 4 aluminum alloy sheet with high strength Gao Si texture has better fatigue properties than that with cubic texture.
【作者单位】：中南大学材料科学与工程学院;
【分类号】：TG146.21

【相似文献】