原位同步加速器x射线微衍射研究了7075铝基喷丸缺口在拉伸载荷作用下的局部应变场演化

IF 6.3 2区 材料科学 Q2 CHEMISTRY, PHYSICAL
Aitor Madariaga , Eduardo Vazquez , Daniel Foster , Enrique Jimenez-Melero
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引用次数: 0

摘要

在航空航天工程中,为了提高铝基合金的疲劳耐受性和缺口敏感性,通常采用喷丸强化技术对铝基合金进行加工。本文采用高空间分辨率的方法绘制了航空7050-T7451合金表面喷丸强化引起的缺口周围局部应变场,并在室温拉伸试验中确定了表面影响层的局部力学行为。为此,我们对缺口试样在机械加工状态下的拉伸加载以及两种不同的喷丸强度进行了原位同步加速器x射线微衍射。不受加工和SP影响的缺口试样的行为也通过有限元建模进行了模拟,以将局部表面力学响应与大块材料行为解耦。结果表明,喷丸强化在缺口尖端附近产生残余压应力,并改变了缺口的几何形状和表面形貌。喷丸表面在拉伸试验的早期阶段经历了塑性效应的调节,并且它们产生的应用标称拉伸应力比加工材料高70-80%。当外加应力增加时,最大纵向弹性应变在表面下移动,并且在加工和喷丸试样中,峰值应变的大小和位置收敛到相同的值。除了屈服之外,在缺口尖端附近的塑性应变呈指数增长,与初始表面条件无关。材料的整体弹塑性响应不受喷丸处理的影响,但压缩残余应变在载荷作用下显著延缓了缺口尖端附近的屈服。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Local strain field evolution at shot-peened 7075 Al-base notches upon tensile loading using in-situ synchrotron X-ray µ-diffraction

Local strain field evolution at shot-peened 7075 Al-base notches upon tensile loading using in-situ synchrotron X-ray µ-diffraction
Shot peening (SP) is commonly applied to Al-base alloys during manufacture to enhance their fatigue tolerance and notch sensitivity in aerospace engineering components with geometrical discontinuities. We have mapped with high spatial resolution the local strain field induced by surface shot peening around notches in aerospace 7050-T7451 alloy, and determined the local mechanical behaviour of the surface affected layer during room-temperature tensile testing. For this purpose, we have performed in-situ synchrotron X-ray µ-diffraction during tensile loading of notched specimens in the as-machined condition, and also for two different shot peening intensities. The behaviour of the notched specimen not affected by machining and SP was also simulated by finite element modelling to decouple the local surface mechanical response from the bulk material behaviour. The results confirmed that shot peening induces compressive residual stresses close to the notch tip, and also changes in notch geometry and surface topography. Shot-peened surfaces experience accommodation of plastic effects at the early stages of the tensile test, and they yielded at ∼70–80 % higher applied nominal tensile stresses than the as-machined material. When increasing the applied stress, the maximum longitudinal elastic strain shifts beneath the surface, and the magnitude of the peak strain and its position converge to the same value for the as-machined and shot-peened specimens. Beyond yielding, there is an exponential increase in plastic strain close to the notch tip, irrespective of the initial surface condition. The overall elasto-plastic response of the material is not affected by shot peening, but compressive residual strains significantly retard yielding close to the notch tip under loading.
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来源期刊
Journal of Alloys and Compounds
Journal of Alloys and Compounds 工程技术-材料科学:综合
CiteScore
11.10
自引率
14.50%
发文量
5146
审稿时长
67 days
期刊介绍: The Journal of Alloys and Compounds is intended to serve as an international medium for the publication of work on solid materials comprising compounds as well as alloys. Its great strength lies in the diversity of discipline which it encompasses, drawing together results from materials science, solid-state chemistry and physics.
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