Microstructure and Mechanical Properties of a Multi-Modal Al Alloy with High Strength

2013 ◽  
Vol 745-746 ◽  
pp. 286-292
Author(s):  
Xiao Ning Hao ◽  
Rui Xiao Zheng ◽  
Li Rong Hao ◽  
Han Yang ◽  
Chao Li Ma
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Alloy Powder ◽  
Mechanical Test ◽  
High Strength ◽  
Bulk Sample ◽  
Coarse Grained ◽  
Al Alloy ◽  
Consolidation Process ◽  
Microstructure And Mechanical Properties

Nanocrystalline (NC) Al alloy powder was fabricated by milling 2024 Al alloy powder and Fe-based metallic glass (FMG) particles. The NC Al alloy powder was consolidated into bulk sample by adding a part of atomized coarse-grained (CG) 2024 alloy powder. The microstructure and mechanical properties of powder and consolidated bulk materials were examined by X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM) and mechanical test. It revealed that the FMG particles were uniformly distributed in the NC aluminum alloy powder. In the consolidation process, the grain size increased, and Al2CuMg phase precipitated. The multi-modal Al alloy by consolidation of FMG particles, NC and CG powder, exhibited higher yield strength up to 517 MPa and better plasticity in comparison to the samples without CG powder.

Effect of Ultra-Fast Cooling Rate on the Microstructure and Mechanical Properties of High Strength Cold-Rolled Sheet under Continuous Annealing

2018 ◽  
Vol 913 ◽  
pp. 311-316
Author(s):  
Kai Zhang ◽  
Ren Bo Song ◽  
Feng Gao ◽  
Wen Jie Niu ◽  
Chi Chen
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Cooling Rate ◽  
High Strength ◽  
Rolled Sheet ◽  
Cooling Rates ◽  
Microstructure And Mechanical Properties ◽  
Average Grain Size ◽  
Cold Rolled ◽  
Fast Cooling

The effect of different fast cooling rates on the microstructure and mechanical properties of the V and Ti microalloyed high strength cold-rolled sheet was studied under laboratory conditions. Five different fast cooling rates were set up as 20°C/s, 50°C/s, 200°C/s, 500°C/s and 1000°C/s, respectively. Optical microscopy (OM), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were used to observe the microstructure, and the mechanical properties were also tested. The results showed that with the increase of fast cooling rate from 20°C/s to 1000°C/s, the grains of martensite and ferrite were finer, and the average grain size of both martensite and ferrite decreased from 7.7μm to 3.9μm. The proportion of ferrite in the two phases decreased while that of the martensite increased from 25.7% to 62.1%. The morphology of martensite tended to be lath, and the density of dislocation in the ferrite grains nearby the martensite gradually increased. With cooling rate rising from 20°C/s to 1000°C/s, the yield strength of the experimental steel increased from 381MPa to 1074MPa, and the tensile strength increased from 887MPa to 1199MPa. And the elongation decreased from 14.2% to 7.2%, and the product of strength and elongation decreased from 12.6GPa·% to 8.6GPa·%.

Microstructural Evolution of Fe-Based Metallic Glass/2024-Al Powder during High Energy Ball Milling Process

2013 ◽  
Vol 745-746 ◽  
pp. 335-340 ◽  
Author(s):  
Rui Xiao Zheng ◽  
Yi Tan Zhang ◽  
Su Jing Ge ◽  
Han Yang ◽  
Chao Li Ma
Keyword(s):  
Electron Microscopy ◽  
Metallic Glass ◽  
Ball Milling ◽  
Microstructural Evolution ◽  
Alloy Powder ◽  
Mechanical Test ◽  
Hardness Test ◽  
High Energy ◽  
Al Alloy ◽  
Micro Hardness

Nanostructured Al alloy powder was prepared by ball milling of a mixture of Fe-based metallic glass (FMG) powder and 2024-Al alloy powder. Microstructural evolution and mechanical properties of the milled composite powder were examined by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and micro-hardness test. It is revealed that after 24h milling, the grain size of the Al alloy powder reduced to about 30nm, and the FMG particles were uniformly distributed throughout the Al matrix. The mechanical test indicated that the micro-hardness of the powder was significantly improved.

scholarly journals Effect of SLM Process Parameters on the Quality of Al Alloy Parts; Part II: Microstructure and Mechanical Properties

2018 ◽  
Author(s):  
Ahmed H. Maamoun ◽  
Yi F. Xue ◽  
Mohamed A. Elbestawi ◽  
Stephen C. Veldhuis
Keyword(s):  
Mechanical Properties ◽  
Process Parameters ◽  
High Strength ◽  
Al Alloy ◽  
Microstructure And Mechanical Properties ◽  
Wide Range ◽  
Powder Characteristics ◽  
High Strength Aluminum Alloys ◽  
Selection Of

Additive manufacturing (AM) provides customization of the microstructure and mechanical properties of components. Selective laser melting (SLM) is the commonly used technique for processing high strength Aluminum alloys. Selection of SLM process parameters could control the microstructure of fabricated parts and their mechanical properties. However, process parameter limits and defects inside the as-built parts present obstacles to customized part production. This study is the second part of a comprehensive work that investigates the influence of SLM process parameters on the quality of as-built Al6061 and AlSi10Mg parts. The microstructure of both materials was characterized for different parts processed over a wide range of SLM process parameters. The optimized SLM parameters were investigated to eliminate the internal microstructure defects. Mechanical properties of the parts were illustrated by regression models generated with design of experiment (DOE) analysis. The results reported in this study were compared to previous studies, illustrating how the process parameters and powder characteristics could affect the quality of produced parts.

Microstructure and Mechanical Properties of α’ Martensite Type Ti-V-Al Alloy after Cold- or Hot Working Process

2010 ◽  
Vol 436 ◽  
pp. 171-177 ◽  
Author(s):  
Hiroaki Matsumoto ◽  
Hiroshi Yoneda ◽  
Kazuhisa Sato ◽  
Toyohiko J. Konno ◽  
Shingo Kurosu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Cell Structure ◽  
High Strength ◽  
Hot Working ◽  
Al Alloy ◽  
Working Process ◽  
Initial Microstructure ◽  
Ti Alloys ◽  
Microstructure And Mechanical Properties ◽  
New Type

Ti alloys are widely utilized for industrial applications due to their excellent mechanical properties combined with low density. In general, Ti alloys are classified as , + and  alloys, with further subdivision into near  and metastable  alloys. Quite recently, we have presented new type structural ’ martensite (H.C.P.) Ti alloys with low Young’s modulus, high strength and excellent ductility at room temperature. In this work, we examined the microstructure and mechanical properties of ’ martensite type Ti-V-Al alloy after cold- or hot working process. Then, we found that deformation behavior of ’ initial microstructure as compared with (+) initial microstructure was different based on the results of stress-strain curves and Processing Maps under the hot working process. Further, cold rolled ’ martensite microstructure exhibited the refined equiaxed dislocation cell structure, thereby resulting in high strength. This result suggests the new type deformation processing (for both cold- and hot work processing) utilizing ’ martensite in industrial Ti alloys.

scholarly journals Effect of Solution and Aging Temperatures on Microstructure and Mechanical Properties of 10Cr13Co13Mo5Ni3W1ⅤE(S280) Steel

Micromachines ◽  
2021 ◽  
Vol 12 (5) ◽  
pp. 566
Author(s):  
Jinyan Zhong ◽  
Zun Chen ◽  
Shanglin Yang ◽  
Songmei Li ◽  
Jianhua Liu ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Stainless Steel ◽  
Retained Austenite ◽  
High Strength ◽  
Solution Temperature ◽  
Microstructure And Mechanical Properties ◽  
Nucleation Sites ◽  
Strengthening Phases ◽  
Martensite Matrix

The article investigated the effects of solution and ging temperatures on microstructure and mechanical properties of ultra-high strength stainless steel 10Cr13Co13Mo5Ni3W1ⅤE(S280). Higher solution temperatures can improve impact toughness because of the quantity reduction of submicron-sized particles which act as microporous nucleation sites. S280 has the best mechanical properties at 1080 ℃ solution temperature. After quenching, the steel is completely martensite with almost no retained austenite. Aging at 560 ℃ results in peak strength due to the precipitation of fine carbides coherent zones. The loss of precipitates/matrix coherency and precipitates coarsening cause a decrease in strength at higher aging temperatures. Good strength and toughness obtained at 540 °C aging temperature are attributed to fine and dispersed strengthening phases such as Cr2C and Fe2Mo, and the recovery of austenite in high-density dislocation martensite matrix. The details of electron microscopy research, strengthening and toughening mechanisms are discussed.

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