Effect of hot isostatic pressing on fatigue behavior and fracture mechanism of A319 aluminum alloy under uniaxial and nonproportional multiaxial loading conditions. Issue 6 (12th April 2022)

• Record Type: Journal Article
• Authors: Liao, Yiping; Liu, Xiaoshan; He, Guoqiu; Zhou, Zhiqiang; Huang, Ziao; Pan, Jiaqi; Li, Jingquan; Wang, Qigui
• Is Part Of: Fatigue & fracture of engineering materials & structures. Volume 45:Issue 6(2022)
• Page Start: 1719
• Page End: 1738
• Publication Date: 2022-04-12
• Subjects: A319 aluminum alloy -- casting porosity -- cyclic deformation characteristics -- fracture mechanism -- hot isostatic pressing -- loading condition; Materials -- Fatigue -- Periodicals; Fracture mechanics -- Periodicals; 620.1123
• DOI: 10.1111/ffe.13695
• Languages: English
• ISSNs: 8756-758X

Abstract

Abstract: The effect of hot isostatic pressing (HIPing)‐induced porosity difference on the fatigue behavior and fracture mechanism of A319 aluminum alloy under uniaxial and nonproportional multiaxial loading is investigated. Non‐HIPed alloy exhibits weaker nonproportional additional hardening capacity than HIPed alloy, which is ascribed to the nonproportional multiaxial loads that enhance the cyclic softening induced by casting pores. Additional plastic damage caused by nonproportional multiaxial loads is highly susceptible to HIPing. Torsional loads trigger the tension‐compression asymmetry of the axial stress response during nonproportional multiaxial fatigue. Multiaxial fatigue life is more sensitive to HIPing at minor total strain amplitudes. The rapid bridging among adjacent pores serves as the preferred channel for fatigue crack propagation. Nonproportional multiaxial loads improve the probability of encountering pores during fatigue crack initiation and propagation. Highlights: Non‐proportional additional hardening ability affected by HIPing is considered. Additional non‐proportional plastic damage is highly sensitive to HIPing. Non‐proportional multiaxial loading results in asymmetry of axial stress response. The effect of HIPing on fracture mode under two loading conditions is evaluated.