Theoretical-Experimental Possibillities of Microstructure Quantification of Dispersion Strengthened Materials

Abstract

<p>The present paper is devoted to the possibilities to classify the spatial arrangement of the elements (features) of a stochastic process with geometrical objects. The fundamental quantities describing point processes were introduced. Experimental possibilities of structural objects determination, possibilities of evaluation of the size distribution of the secondary phases, testing of planar point structures (estimation of the process intensity, square method and characteristics of the second order) were estimated. Interparticle distances, namely mean interparticle distance, mean minimum distance, mean visibility and mean path of spherical contact were defined. Selected processes were described and demonstrated from simulated realizations on Al-Al<sub>4</sub>C<sub>3 </sub> dispersion strengthened material, prepared by a powder metallurgy method of reaction milling. Interparticle distances of Al<sub>4</sub>C<sub>3</sub> particles were evaluated. Polygonal methods and quadrant counts method were used for characterization of the particle arrangement.</p>

The Influence of Laser Surface Remelting on the Tribological Behavior of the ECAP-Processed AZ61 Mg Alloy and AZ61–Al2O3 Metal Matrix Composite

“…The obtained results (Figure 5) indicate that the observed "dendrites-to-grains" microstructural modification (Figures 3 and 4) plays a crucial role in improving the nanoindentation characteristics of the studied materials. This observation is in good agreement with similar findings of other studies about magnesium and aluminum alloys with incorporated nanoparticles [32][33][34][35]. Such laser-induced hardening behavior is expected to also enhance the tribological properties of the materials studied in the present work.…”

The Influence of Severe Plastic Deformation and Subsequent Annealing on the Microstructure and Hardness of a Cu–Cr–Zr Alloy

“…Therefore, it is necessary to explore the relationship between microstructural parameters and their properties. The strength of SPD-deformed materials can be further improved by alloying, as the solute atoms and precipitates have a pinning effect on dislocations and grain boundaries, as shown in previous studies [18][19][20][21][22].…”

Case Study of the Tensile Fracture Investigation of Additive Manufactured Austenitic Stainless Steels Treated at Cryogenic Conditions

“…AM shows the potential to substitute conventional metal manufacturing processes, such as casting and forging [3,4], mainly in the aerospace and biomedical fields. Thanks to improved reliability and reproducibility of the processes, AM competes with other progressive processes such as severe plastic deformation (SPD) [3][4][5][6][7] with substantial advantages such as the absence of constraints in the manufacturing design, shape freedom, high complexity of the components, combination of multiple parts into one part, production of functionally graded materials, reduced tooling requirements, and the possibility of production on demand [8][9][10].…”

“…The laser powder bed fusion process (LPBF), also known as selective laser melting (SLM), directly produces homogenous metal objects, layer by layer, from 3D Computer Assisted Drawing (CAD) data, by selectively melting fine layers of metal powder with a laser beam [1][2][3][4][5][6][7][8]. A considerable amount of material can be saved by designing properly for additive manufacturing with no loss in terms of mechanical properties [11][12][13].…”

“…Especially, in AM products, cryogenic treatment is still very rare. The austenitic 316L grade is a popular steel for cryogenics as demonstrated by the vast literature, with special applications in the field of liquid gas confinement and storage [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 ]. Mechanisms governing tensile properties at cryogenic temperatures for wrought materials have been extensively and deeply investigated [ 25 ].…”