Article
Nanoscience & Nanotechnology
Yuna Wu, Hengcheng Liao, Yunyi Tang
Summary: This study investigated the high-cycle fatigue behavior of Al-Si alloys under different conditions and found that the fatigue strength of the alloy is lower at 350 degrees C with different fatigue crack origins. Additionally, the study showed that at high temperatures, the hardness and reduced modulus of the Al15Mn3Si2 phase are higher, making cracks more likely to initiate and propagate.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Engineering, Mechanical
Susong Yang, Weiping Hu, Zhixin Zhan, Jian Li, Chunyu Bai, Qiang Yang, Qingchun Meng
Summary: This study systematically investigates the influence of scratches on the fatigue performance of cast aluminum alloy and develops a novel fatigue damage model based on continuum damage mechanics. The model provides an accurate evaluation of the fatigue performance of components with scratches.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Nanoscience & Nanotechnology
Mitsuhiro Okayasu, Naoki Sahara, Norihito Mayama
Summary: The mechanical properties of die-cast Al-Si-Cu alloy (DC ADC12) were improved using new processing techniques that induce grain refinement and precipitation hardening. Adding Na before the T5 process improved the mechanical properties of ADC12. The research also found that grain refinement of ADC12 can be achieved by introducing Na using NaHCO3 rather than metallic Na, resulting in remarkable improvements in ultimate tensile strength and fracture strain.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Engineering, Mechanical
Ahmad Nourian-Avval, Ali Fatemi
Summary: This article investigates the fatigue performance of A356-T6 aluminum alloy under different loading conditions, revealing that fatigue cracks initiated from defects, mainly porosity, and grew on the plane of maximum principal stress. Experimental fatigue life data were predicted using small crack growth models and maximum defect size estimated by extreme value statistics, showing very good agreements with the actual fatigue lives under different loading conditions.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2021)
Article
Materials Science, Multidisciplinary
Zicong Cao, Weizheng Zhang
Summary: In this study, strain-controlled low-cycle-fatigue (LCF) and low-cycle-fatigue-creep (LCFC) experiments were conducted on a cast Al-Si-Cu alloy. The results showed significant softening behavior, with temperature affecting both the softening behavior and fatigue life. Coupling creep at 250°C was found to increase fatigue life. Microstructure evolution was investigated, and the introduction of strain-dwell at the tensile peak caused the interaction of fatigue and creep, affecting fatigue life. Fracture models were proposed for LCF and LCFC tests at different temperatures, based on microstructure evolution. A modified life prediction model was proposed, demonstrating better prediction ability than traditional models in fatigue-creep life prediction under different conditions.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Nanoscience & Nanotechnology
Zhenming Li, Qigui Wang, Dale Gerard
Summary: Increasing the testing temperature significantly decreases the tensile and fatigue strengths of the as-cast Mg-3.73Nd-0.56Zr alloy. The deformation behavior of the alloy at elevated temperature mainly depends on dislocation-slip and twinning. Cracks in the alloy mainly originate from casting defects. The competition between micro-hardening and micro-softening determines the stress response behavior of the alloy during cyclic loading.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
W. Li, L. Shi, Y. Shi, X. Su
Summary: Humidity has a negative impact on the ultrasonic fatigue life of the AS7GU-T64 alloy. Furthermore, the size of crack initiation was identified as a significant factor influencing the percentage of crack initiation life in relation to the overall fatigue life.
EXPERIMENTAL MECHANICS
(2023)
Article
Engineering, Mechanical
Peter Szalva, Imre Norbert Orbulov
Summary: Experimental fatigue test and fracture mechanics approach were used to investigate the fracture resistance and threshold stress intensity value of AlSi9Cu3(Fe) vacuum-assisted high pressure die cast specimens. The specimens were divided into two groups with natural defects and additional artificial defects, with fatigue strength values of 104.7MPa, 92.7MPa, and 87.2MPa for different specimen configurations.
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2021)
Article
Materials Science, Multidisciplinary
Tungky Subroto, Dmitry G. Eskin, Alexis Miroux, Kjerstin Ellingsen, Mohammed M'Hamdi, Laurens Katgerman
Summary: This study investigated the mechanical behavior and failure mechanism of AA7050 aluminum alloy in the semi-solid state, and obtained constitutive parameters through thermal modeling and numerical tests. The extracted parameters support the alloy's susceptibility to hot tearing and can enhance predictive capability of computer simulations in direct-chill casting.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2021)
Article
Metallurgy & Metallurgical Engineering
Lei Deng, Hai-dong Zhang, Guo-ai LI, Xue-feng Tang, Pu-song Yi, Zhao Liu, Xin-yun Wang, Jun-song Jin
Summary: The hot deformation behavior and microstructure evolution of 6082 aluminum alloy fabricated through squeeze casting (SC) under different pressures were studied. It was found that higher SC pressure resulted in the generation of more dynamic recrystallization (DRX) grains during deformation. However, the effect of SC pressure on microstructure evolution weakened at high temperature due to the dissolution of second phase particles. Additionally, uneven second phase particles in specimens fabricated under higher SC pressure compressed with low temperature and middle strain rate would lead to flow localization instability. The optimum deformation conditions for the 6082 aluminum alloy fabricated by SC were determined to be temperatures of 430-500℃ and strain rates of 0.01-1 s(-1).
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
(2022)
Article
Materials Science, Multidisciplinary
Mohammad Sadegh Aghareb Parast, Mohammad Azadi
Summary: This article investigates the influence of nano-clay particles and heat treating on the pure and fretting fatigue properties of piston aluminum alloys. The results showed that the fatigue lifetime of the nano-composites decreased under the highest stress level, but the heat treatment improved the fatigue properties. Fretting damage reduced the fatigue lifetime of all specimens, especially at lower stress levels.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2022)
Article
Nanoscience & Nanotechnology
S. S. Dash, D. J. Li, X. Q. Zeng, D. Y. Li, D. L. Chen
Summary: The aim of this study is to investigate the monotonic and cyclic deformation behavior of a high-pressure die cast Silafont (R)-36 alloy in a naturally-aged T4 state. The T4 heat treatment led to significant microstructural changes, resulting in the transformation of coralloid-like eutectic Si particles to spheroidal Si particles embedded in the Al matrix. The T4 alloy exhibited strong cyclic hardening and a longer low cycle fatigue life compared to its as-cast state at lower strain amplitudes, attributed to particle-dislocation interactions during deformation. A strain energy density-based model incorporating microstructural aspects can be used to predict the fatigue life of the T4 alloy.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Engineering, Mechanical
I. M. Matos, J. A. Araujo, F. C. Castro
Summary: This study conducted fretting fatigue tests on AA1120 wires and compared them with AA1350 and AA6201 wires. The results showed that AA1120 wires had longer lives than AA1350 wires in axial fatigue tests, but had similar fatigue strengths to AA6201 wires in fretting fatigue tests.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2022)
Article
Materials Science, Multidisciplinary
Yizhuo Li, Delphine Retraint, Pengfei Gao, Hongqian Xue, Tao Gao, Zhidan Sun
Summary: The effect of Surface Mechanical Attrition Treatment (SMAT) on torsional fatigue properties of a 7075 aluminum alloy was investigated. The results show that SMAT can have both beneficial and detrimental effects on fatigue life, depending on the testing conditions.
Article
Nanoscience & Nanotechnology
Zepeng Liu, Hongxia Zhang, Zhifeng Yan, Peter K. Liaw, Peng Dong
Summary: The fully reversed stress-controlled tension-compression fatigue experiments were conducted to study the cyclic deformation and fatigue behavior of 7075-T651 aluminum alloys with and without a surface mechanical rolling treatment (SMRT). Results showed that SMRT significantly increased the fatigue strengths of the alloys, but also led to more remarkable ratcheting effects and tension-compression asymmetry in the fatigue specimens. Additionally, a failure-mode transition from intrusions and extrusions to the Al18Ti2Mg3 constituent phase was observed in both base metal and SMRT specimens.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
