Koichi Kitazono
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View article: Effect of Nb interlayer on residual and bending stress relaxation in Si<sub>3</sub>N<sub>4</sub>/Nb/Ti-6Al-4V joints
Effect of Nb interlayer on residual and bending stress relaxation in Si<sub>3</sub>N<sub>4</sub>/Nb/Ti-6Al-4V joints Open
In dissimilar joints between Si3N4 and Ti-6Al-4V, insertion of a ductile Nb interlayer is effective for stress relaxation under bonding and loading. In this study, elastoplastic analysis using the finite element method (FEM) was applied to…
View article: Enhanced Mechanical Properties of Mg-9Al-1Zn-2Ca Alloy Plates by Thermomechanical Treatment Based on Hot-Pressing
Enhanced Mechanical Properties of Mg-9Al-1Zn-2Ca Alloy Plates by Thermomechanical Treatment Based on Hot-Pressing Open
Flame-retardant magnesium alloys prepared by adding calcium have been used as lightweight structural material. Thermomechanical treatments using hot rolling or hot extrusion are effective to improve the mechanical properties of flame-retar…
View article: Improvement in strength and ductility of flame-retardant magnesium alloy through uniaxial hot pressing
Improvement in strength and ductility of flame-retardant magnesium alloy through uniaxial hot pressing Open
Flame-retardant magnesium alloys containing calcium element are attracting attention from aircraft and automotive industries because of their low density and high ignition temperature. Though thermomechanical treatments such as hot extrusi…
View article: Design and Applications of Additively Manufactured Porous Aluminum Alloys
Design and Applications of Additively Manufactured Porous Aluminum Alloys Open
Additive manufacturing (AM) technology enables to manufacture many types of porous aluminum alloys. Present study focusses on AM porous Al–4.8Mg–0.7Sc alloys manufactured through laser powder bed fusion process. Eight types of ordered cell…
View article: PREFACE
PREFACE Open
The eighteenth International Conference on Aluminium Alloys (ICAA 18) was successfully held in 48 September of 2022 in Toyama, Japan.477 participants (360 onsite and 117 online) were taken part in from 24 countries and areas.The main theme…
View article: Effects of random and controlled irregularity in strut lattice structure of PA12 on compression anisotropy
Effects of random and controlled irregularity in strut lattice structure of PA12 on compression anisotropy Open
Lattice structures have attracted significant attention as novel energy-absorbing structures; however, regular lattice structures have anisotropic energy-absorbing properties. To make the energy absorption properties isotropic, the irregul…
View article: Cell Size Effects in Additively Manufactured Porous Titanium Consisting of Ordered Rhombic Dodecahedron Cells
Cell Size Effects in Additively Manufactured Porous Titanium Consisting of Ordered Rhombic Dodecahedron Cells Open
Lightweight porous metals have been focused on as structural and energy absorbing materials. Mechanical properties of classical porous metals fall under the specific specimen dimension. Such cell size effects are mainly caused by the disor…
View article: Fabrication of flame-retardant magnesium alloy hollow sphere with specific gravity less than one through atmospheric foaming
Fabrication of flame-retardant magnesium alloy hollow sphere with specific gravity less than one through atmospheric foaming Open
Metallic hollow sphere is a kind of lightweight metal foams. Most metallic hollow spheres have been made of iron. The authors have succeeded to fabricate Mg-Al-Zn alloy hollow spheres through inert gas foaming in the previous study. In the…
View article: Anisotropic Compression Behavior of Additively Manufactured Porous Titanium with Ordered Open-Cell Structures at Different Temperatures
Anisotropic Compression Behavior of Additively Manufactured Porous Titanium with Ordered Open-Cell Structures at Different Temperatures Open
Anisotropic compression behavior of open-cell porous titanium is evaluated at different temperatures. Porous titanium specimens with truncated octahedron unit cells are designed by 3D-Voronoi division. Cubic specimens with the porosities o…
View article: Evaluation of energy absorbing property of additively manufactured porous Al-10Si-0.3Mg alloys with an acorn shape at the landing of the smart lander on the inclined plane or the plane with a boulder
Evaluation of energy absorbing property of additively manufactured porous Al-10Si-0.3Mg alloys with an acorn shape at the landing of the smart lander on the inclined plane or the plane with a boulder Open
Energy absorbing materials with isotropic mechanical properties are necessary for landing gears of spacecrafts. Porous Al-10Si-0.3Mg alloys with an acorn shape are designed for JAXA small lander for investigating moon. The ordered cellular…
View article: Design, FEM Analysis and Compression Tests on Energy-Absorbing Property of Disordered Cellular Solids Developed by 3D-Voronoi Division
Design, FEM Analysis and Compression Tests on Energy-Absorbing Property of Disordered Cellular Solids Developed by 3D-Voronoi Division Open
Lightweight cellular solids have been used as an energy-absorbing material for automotive and aerospace applications. Additive manufacturing is a useful process for the design and manufacture of cellular solids. The present study focuses o…
View article: Effect of post heat treatment on tensile strength of dissimilar aluminum alloy joints manufactured through powder bed fusion process
Effect of post heat treatment on tensile strength of dissimilar aluminum alloy joints manufactured through powder bed fusion process Open
Al–10Si–0.3Mg alloy has been additively manufactured on a commercial A5083 aluminum alloy bar through powder bed fusion (PBF) process. Post heat treatment at 813 K for 2 h was carried out after the building. The bonding strength before the…
View article: Effect of Post Heat Treatment on the Mechanical Properties of Porous Ti–6Al–4V Alloys Manufactured through Powder Bed Fusion Process
Effect of Post Heat Treatment on the Mechanical Properties of Porous Ti–6Al–4V Alloys Manufactured through Powder Bed Fusion Process Open
Ti6Al4V alloys are widely used as a structural material.Open-cell porous Ti6Al4V alloys with different porosities are manufactured through powder bed fusion process.Cylindrical specimens consisting of ordered truncated octahedron unit-cell…
View article: In-Situ Observation of Spall-Like Damage on Backside of Silica Glass Plate Subjected to Hypervelocity Impact of Micro Debris
In-Situ Observation of Spall-Like Damage on Backside of Silica Glass Plate Subjected to Hypervelocity Impact of Micro Debris Open
In this study, a series of hypervelocity impact (HVI) experiments for silica glass plate targets were conducted to evaluate the nucleation and propagation mechanisms of spall-like damage on backside of the plates by impacting a small proje…
View article: Three-dimensional internal failure propagation by spherical elastic waves in fused silica glass plate subjected to hypervelocity impact of debris
Three-dimensional internal failure propagation by spherical elastic waves in fused silica glass plate subjected to hypervelocity impact of debris Open
With the development of spacecraft, the brittle materials like ceramics and glass have been used for significant components especially in optical and thermal systems. However, they are vulnerable to damage by hypervelocity impact of space …
View article: Effects of Cell Morphology and Heat Treatment on Impact Energy Absorption Property of Porous Aluminum Used for Landing Gears of a Small Satellite
Effects of Cell Morphology and Heat Treatment on Impact Energy Absorption Property of Porous Aluminum Used for Landing Gears of a Small Satellite Open
Energy absorbing system for landing gears is an important on the SLIM project. Open cell porous aluminum manufactured through 3D selective laser melting (SLM) process has been applied on the energy absorbing system. Compressive tests for c…
View article: Low-temperature creep mechanism in ultrafine-grained aluminum
Low-temperature creep mechanism in ultrafine-grained aluminum Open
This study investigated the low-temperature creep mechanisms in ultra-fine grained aluminum made by accumulative roll bonding. The low-temperature creep behaviors in ultra-fine grained aluminum with grain size of 0.39 µm were divided into …
View article: Compressive Behavior of Open-Cell Titanium Foams with Different Unit Cell Geometries
Compressive Behavior of Open-Cell Titanium Foams with Different Unit Cell Geometries Open
Mechanical properties of open-cell titanium foams with different cell geometries (truncated octahedron and rhombic dodecahedron cells) were examined through compressive tests. These foams were manufactured through the electron beam melting…
View article: Microstructural Evolution through Uniaxial Hot Pressing before Age Hardening of AZ91D Alloy
Microstructural Evolution through Uniaxial Hot Pressing before Age Hardening of AZ91D Alloy Open
In recent years, magnesium alloys are attracting attention from aircraft and automotive industries because of their low density, high specific strength and high damping capacity. However, magnesium alloys suffer from low ductility at room …
View article: High-Speed Compact Entry Capsule Enhanced by Lightweight Ablator and Crushable Structure
High-Speed Compact Entry Capsule Enhanced by Lightweight Ablator and Crushable Structure Open
Recently, target bodies of the solar exploration extended to distant heavenly bodies beyond the Mars, and even to more distant ones. Because the overall mission duration tends to be longer and longer in such high-energy missions, reliabili…