Hiro Fujihara
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View article: Exceptional stress corrosion cracking resistance-strength synergy of Al-Zn-Mg-Cu alloys via tailored nano-sized particles
Exceptional stress corrosion cracking resistance-strength synergy of Al-Zn-Mg-Cu alloys via tailored nano-sized particles Open
High-strength Al-Zn-Mg-Cu alloys are extensively utilized in the aeronautics sector for lightweighting, but they are notoriously susceptible to stress corrosion cracking (SCC). Herein, a novel strategy was proposed to mitigate SCC in Al-Zn…
View article: Maximising mechanical properties of aluminium alloys by microstructural optimisation using a coarsened surrogate model
Maximising mechanical properties of aluminium alloys by microstructural optimisation using a coarsened surrogate model Open
Surrogate-based microstructural optimization was applied to describe the relationship between local microstructural patterns and particle damage in wrought 2024 aluminium alloy. A support vector machine was used to realise high-accuracy op…
View article: Multi-Modal 3D Image-Based Simulation of Hydrogen Embrittlement Crack Initiation in Al-Zn-Mg Alloy
Multi-Modal 3D Image-Based Simulation of Hydrogen Embrittlement Crack Initiation in Al-Zn-Mg Alloy Open
In Al-Zn-Mg alloy, hydrogen (H) leads remarkably to the degradation of mechanical properties. It is indispensable to suppress this phenomenon called hydrogen embrittlement (HE) for developing the high-strength Al-Zn-Mg alloy. Because inter…
View article: Numerical verification for the effect of suppressing hydrogen embrittlement by Sn doping in the Al–Zn–Mg alloy
Numerical verification for the effect of suppressing hydrogen embrittlement by Sn doping in the Al–Zn–Mg alloy Open
Hydrogen embrittlement (HE) suppression by doping an aluminum–zinc–magnesium (Al–Zn–Mg) alloy with tin (Sn) is reported experimentally. The suppression likely results from hydrogen absorption by Sn second-phase particles. We verified the s…
View article: Hydrogen Induced Debonding of Mg<sub>2</sub>Si Particle/Aluminum Interface in Al-Mg-Si Alloy
Hydrogen Induced Debonding of Mg<sub>2</sub>Si Particle/Aluminum Interface in Al-Mg-Si Alloy Open
Recent research has shown that some intermetallic compound particles with high interfacial hydrogen trap energies (e.g., Mg2Si) are prone to damage at high hydrogen concentrations. In this study, the acceleration of particle damage in an A…
View article: Dominant Factors Controlling the Initiation of Hydrogen Embrittlement in Al-Zn-Mg Alloy
Dominant Factors Controlling the Initiation of Hydrogen Embrittlement in Al-Zn-Mg Alloy Open
The surrogate-based microstructural optimization was applied to describe the relationship between local crystallographic microstructure and intergranular hydrogen embrittlement in an Al-Zn-Mg alloy. The support vector machine with an infil…
View article: Multi-modal 3D image-based simulation of hydrogen embrittlement crack initiation in Al-Zn-Mg alloy
Multi-modal 3D image-based simulation of hydrogen embrittlement crack initiation in Al-Zn-Mg alloy Open
In Al-Zn-Mg alloy, hydrogen leads to degradation of mechanical properties. It is indispensable to suppress this phenomenon called hydrogen embrittlement (HE) for increasing the strength of Al-Zn-Mg alloy. Intergranular fracture (IGF) mainl…
View article: Growth Behavior of Pores and Hydrogen Desorption Behavior in Pure Aluminum and A6061 Aluminum Alloys
Growth Behavior of Pores and Hydrogen Desorption Behavior in Pure Aluminum and A6061 Aluminum Alloys Open
An increase in the volume fraction of pores in aluminum alloys causes a decrease in the elongation and the strength of alloys. To improve the mechanical properties of aluminum alloys, it is important to understand the growth and shrinkage …
View article: Dominant Factors Controlling the Initiation of Hydrogen Embrittlement in Al–Zn–Mg Alloy
Dominant Factors Controlling the Initiation of Hydrogen Embrittlement in Al–Zn–Mg Alloy Open
Surrogate-based microstructural optimization was applied to model the relationship between local crystallographic microstructure and intergranular hydrogen embrittlement in an Al–Zn–Mg alloy, and a support vector machine with an infill sam…
View article: Surrogate-based optimization of microstructural features of structural materials
Surrogate-based optimization of microstructural features of structural materials Open
This paper proposes a methodology for surrogate-based microstructural optimization of structural metals that integrates a limited number of 3D image-based numerical simulations with microstructural quantification and coarsening and optimis…
View article: Growth behavior of pores and hydrogen desorption behavior in pure aluminum and A6061 aluminum alloys
Growth behavior of pores and hydrogen desorption behavior in pure aluminum and A6061 aluminum alloys Open
An increase in the volume fraction of pores in aluminum alloys causes a decrease in the elongation and the strength of alloys. To improve the mechanical properties of aluminum alloys, it is important to understand the growth and shrinkage …
View article: Direct observation of three-dimensional short fatigue crack closure behavior in Ti-6Al-4V alloy using ultra-high-resolution X-ray microtomography
Direct observation of three-dimensional short fatigue crack closure behavior in Ti-6Al-4V alloy using ultra-high-resolution X-ray microtomography Open
Local 3D short fatigue crack closure behavior was investigated in Ti-6Al-4V alloy using ultra-high-resolution X-ray microtomography (XMT). The results show that the inhomogeneous distribution of plasticity-induced and roughness-induced cra…
View article: Influence of Hydrogen on the Damage Behavior of IMC Particles in Al–Zn–Mg–Cu Alloys
Influence of Hydrogen on the Damage Behavior of IMC Particles in Al–Zn–Mg–Cu Alloys Open
In recent years, it has been reported that intermetallic compound particles can suppress hydrogen embrittlement by hydrogen trapping. Some intermetallic particles in aluminum alloys, such as Al7Cu2Fe, have internal hydrogen trap sites; it …
View article: Suppression of Hydrogen Embrittlement due to Local Partitioning of Hydrogen to Dispersed Intermetallic Compound Particles in Al–Zn–Mg–Cu Alloys
Suppression of Hydrogen Embrittlement due to Local Partitioning of Hydrogen to Dispersed Intermetallic Compound Particles in Al–Zn–Mg–Cu Alloys Open
Recent studies have revealed that hydrogen embrittlement in Al–Zn–Mg alloys appears to be dominated by hydrogen partitioning to MgZn2 precipitates. A method has recently been proposed for reducing the hydrogen concentration at MgZn2 precip…
View article: Influence of hydrogen on the damage behavior of IMC particles in Al-Zn-Mg-Cu alloys
Influence of hydrogen on the damage behavior of IMC particles in Al-Zn-Mg-Cu alloys Open
In recent years, it has been reported that intermetallic compound particles can suppress hydrogen embrittlement by hydrogen trapping into them. Some intermetallic particles in aluminum alloys, such as Al7Cu2Fe, have internal hydrogen trap …