scholarly journals Modification of Lattice Structures and Mechanical Properties of Metallic Materials by Energetic Ion Irradiation and Subsequent Thermal Treatments

2020 ◽  
Vol 4 (1) ◽  
pp. 17 ◽  
Author(s):  
Akihiro Iwase ◽  
Fuminobu Hori
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloys ◽  
Thermal Treatment ◽  
Intermetallic Compounds ◽  
Ion Irradiation ◽  
High Energy ◽  
Industrial Applications ◽  
The Other ◽  
Lattice Structures ◽  
Subsequent Thermal Treatment

When materials are irradiated with high-energy ions, their energies are transferred to electrons and atoms in materials, and the lattice structures of the materials are largely changed to metastable or non-thermal equilibrium states, causing the modification of several physical properties. There are two processes for the material modification by ion irradiation; one is “the irradiation-enhanced process”, and the other is “the irradiation-induced process”. In this review, two kinds of recent results for the microstructural changes and the modifications of mechanical properties will be summarized: one is the hardness modification of dilute aluminum alloys, which is a result of the irradiation-enhanced process, and the other is the hardness modification of Ni-based intermetallic compounds as a result of the irradiation-induced process. The effect of the subsequent thermal treatment on the microstructures and the hardness for ion-irradiated dilute aluminum alloys is quite different from that for Ni-based intermetallic compounds. This result reflects the difference between the irradiation-enhanced process and the irradiation-induced process. Finally, possibilities of the ion irradiation and subsequent thermal treatment to industrial applications will also be discussed.

scholarly journals Electron Beam Melting of Ti-6Al-4V Lattice Structures; Correlation between Post Heat Treatment and Mechanical Properties

2021 ◽  
Author(s):  
Giuseppe Del Guercio ◽  
Manuela Galati ◽  
Abdollah Saboori
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Computer Aided Design ◽  
Mechanical Performance ◽  
Industrial Applications ◽  
Heat Treatments ◽  
Layer By Layer ◽  
Lattice Structures ◽  
Heat Treated ◽  
Aided Design

Abstract Additive Manufacturing processes are considered advanced manufacturing methods. It would be possible to produce complex shape components from a Computer-Aided Design model in a layer-by-layer manner. Lattice structures as one of the complex geometries could attract lots of attention for both medical and industrial applications. In these structures, besides cell size and cell type, the microstructure of lattice structures can play a key role in these structures' mechanical performance. On the other hand, heat treatment has a significant influence on the mechanical properties of the material. Therefore, in this work, the effect of the heat treatments on the microstructure and mechanical behaviour of Ti-6Al-4V lattice structures manufactured by EBM was analyzed. The main mechanical properties were compared with the Ashby and Gibson model. It is very interesting to notice that a more homogeneous failure mode was found for the heat-treated samples. The structures' relative density was the main factor influencing their mechanical performance of the heat-treated samples. It is also found that the heat treatments were able to preserve the stiffness and the compressive strength of the lattice structures. Besides, an increment of both the elongation at failure and the absorbed energy was obtained after the heat treatments. Microstructure analysis of the heat-treated samples confirms the increment of ductility of the heat-treated samples with respect to the as-built one.

scholarly journals A Fast Method for Predicting the Mechanical Properties of Precipitation-Hardenable Aluminum Alloys

Metals ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 147 ◽  
Author(s):  
Anastasiya Toenjes ◽  
Axel von Hehl
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Aluminum Alloys ◽  
Method Development ◽  
Prediction Models ◽  
Industrial Applications ◽  
Fast Method ◽  
Suitable Heat Treatment ◽  
Cost Efficient ◽  
The Individual

Most heat treatment simulations of precipitation-hardenable aluminum alloys are incomplete or restricted to sub-steps of the process chain. In general, the studies addressing the heat treatment of aluminum components have only provided a qualitative guidance of heat treatment, which does not match the heat treatment that is necessary for specific parts with specific requirements. Thus, a quick and accurate simulation of the whole heat treatment process would hold great economic benefit for industrial applications in predicting suitable heat treatment processes that are able to meet the required mechanical properties of proposed novel aluminum components. In this paper, the development of a time and cost efficient method for generating such prediction models is presented by means of an example aluminum alloy EN AW-6082. During the process sub-steps of solution annealing, quenching and aging, the time-temperature correlations connected to the precipitation-hardening conditions were analyzed. The precision of the prediction model depends on the size of the material database, which should be able to be adjusted to the individual requirements of the simulation user. In order to obtain the greatest time and cost efficiency in generating such a model, a specific experimental design was developed. The results of the method development are presented and discussed.

Mechanical Properties Of Quasicrystal Dispersed Al-Li-Cu Alloy

1998 ◽  
Vol 553 ◽  
Author(s):  
T. Okada ◽  
T. Nakamura ◽  
K Mitsugi ◽  
K Kozawa ◽  
T Matumura ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloys ◽  
Vickers Hardness ◽  
The Other ◽  
Proof Stress ◽  
Specific Strength ◽  
Cu Alloy ◽  
Ti Alloys ◽  
Maximum Value ◽  
The Relationship

AbstractTo apply the ductile structural materials, the quasicrystal dispersion in aluminum alloys is one of effective methods. We have investigated mechanical properties of quasicrystal dispersed Al- Li-Cu alloy prepared by the twin-type piston anvil apparatus. The slow cooled samples are hard and ductile. The evaluated values of brittleness are from 6.0 to 14 erg for Ef, from 0.52 to 0.73MNm−3/2 for K1c and from 5.5 to 7.7 Nm−1 for Gic for the fastest and slowest cooled samples, respectively. The hardness of the quasicrystal dispersed Al-Li-Cu alloy is higher than that of the other commercial aluminum alloys. Based on the relationship between Vickers hardness and proof stress of aluminum alloys, we estimate the specific strength of Al-Li-Cu quasicrystal alloy. The maximum value is the higher than that of Ti alloys.

scholarly journals Wire-arc additive manufacturing of Al-Mg alloy using CMT and PMC technologies

2018 ◽  
Vol 233 ◽  
pp. 00031 ◽  
Author(s):  
Bianca F. Gomes ◽  
Paulo J. Morais ◽  
Vítor Ferreira ◽  
Margarida Pinto ◽  
Luiz H. de Almeida
Keyword(s):  
Mechanical Properties ◽  
Additive Manufacturing ◽  
Raw Materials ◽  
Industrial Applications ◽  
The Other ◽  
Mg Alloy ◽  
Cold Metal Transfer ◽  
Small Pore ◽  
Wire Arc Additive Manufacturing ◽  
Pore Fraction

Among the several metallic additive manufacturing (MAM) technologies available, the wire-and-arc based ones are very beneficial due to the lower operational costs, higher efficiency use of raw materials, and high deposition rates achieved. The Cold Metal Transfer (CMT) process stands out by the lower heat input compared to the other wire-and-arc based methods. On the other hand, processes such as Pulse Multi Control (PMC) and its variants have not been tested yet in additive manufacturing and for this reason they should be evaluated. Therefore, considering the technologies potential and the need of automotive and aeronautical industry of manufacturing parts of complex and optimized geometry in a faster way, the study of these technologies is very relevant. Thus, the objective of this paper is the additive manufacturing of walls with Al-Mg alloy using CMT, CMT-Pulse, PMC, PMC-Mix, and MIG-Pulse, and the evaluation of the hardness, mechanical strength, and porosity of the manufactured parts aiming future industrial applications. The results showed good mechanical properties, small pore fraction, and geometric uniformity of parts produced with PMC and PMC-Mix. MIG-Pulse and PMC parts presented the smaller pore fraction among the GMAW variants, although no difference was noticed in the mechanical properties of the parts.

Radiation Induced Amorphous Transformation in Intermetallic Compounds

1981 ◽  
Vol 7 ◽  
Author(s):  
J. L. Brimhall ◽  
H. E. Kissinger ◽  
L. A. Charlot
Keyword(s):  
Intermetallic Compounds ◽  
Electron Concentration ◽  
Phase Field ◽  
Ion Irradiation ◽  
Amorphous State ◽  
High Energy ◽  
Defect State ◽  
Outer Electron ◽  
Ordered Phases ◽  
Radiation Induced

ABSTRACTIntermetallic compounds and ordered phases in the Ti-Ni, Ti-Fe, Re-Ta, and Mo-Ni systems became amorphous after high energy, ion irradiation. Compounds in the Ni-Al and Fe-Al systems remained crystalline and formed dislocation networks after similar irradiation. The ease of amorphous formation correlated best with the lack of solubility within the phase field. The high internal energy of the defect state in these limited solubility alloys is believed responsible for the tendency to transform to an amorphous state. A correlation with other properties such as atom size ratio or outer electron concentration was not found.

scholarly journals Effect of ion irradiation on structural state and mechanical properties of naturally-aged hot-pressed D16 (Al-Cu-Mg) alloy profiles

2021 ◽  
Vol 2064 (1) ◽  
pp. 012060
Author(s):  
N V Gushchina ◽  
V V Ovchinnikov ◽  
L I Kaigorodova ◽  
D Y Rasposienko ◽  
D I Vichuzhanin
Keyword(s):  
Mechanical Properties ◽  
Phase Composition ◽  
Intermetallic Compounds ◽  
Ion Irradiation ◽  
Irradiation Time ◽  
Ion Beam ◽  
Sample Surface ◽  
Strength Properties ◽  
Stable Phase ◽  
Subgrain Structure

Abstract The effect of irradiation with 20 keV argon ions on the mechanical properties, structure, and phase composition of quenched and then naturally aged, hot-pressed profiles (6 mm thick) from the D16 alloy of the Al-Cu-Mg system has been studied. It was found that short-term irradiation with Ar+ ions (E = 20 keV, j = 200 μA/cm2, F = 1×1016 cm-2, irradiation time 8 s) leads to transformation of the microstructure and phase composition of the alloy. The coarsening of the initial subgrain structure occurs near the sample surface. Both in the surface layer and at a distance of ∼ 150 μm from it, partial dissolution and fragmentation of complex intermetallic compounds of crystallization origin located along grain boundaries are observed, as well as a decrease in the size and change in the morphology of Al6(Fe, Mn) intermetallic compounds of crystallization origin are observed too: the distribution density of lamellar precipitations decreases, and equiaxial precipitations disappear. Under the influence of irradiation, the decomposition of the supersaturated solid solution is activated with the formation of a more stable phase S’. As a result of ion-beam treatment in this mode, the plasticity of the alloy increases while maintaining the strength properties.

Sign in / Sign up

Export Citation Format

Share Document