Effects of warm saddle forging deformation on the reduction of second-phase particles and control of the three-dimensional mechanical properties of 2219 aluminum alloy rings

2618 aluminum alloy has been used in aerospace structural parts, but the coarse second phase particles agglomerated in the alloy usually result in poor mechanical properties. In this paper, the morphology and distribution of the second phase particles and the mechanical properties of 2618 aluminum alloy ring were investigated, and the fracture morphology is observed by scanning electron microscope (SEM) and analyzed by energy dispersive X-ray spectroscopy (EDS). The result show that the mechanical properties in the axial direction are lower than those in the circumferential direction. It is evidentially shown that the agglomeration of Al9FeNi intermetallic particles and magnesium oxides in the fracture is the main reason for the poor mechanical properties in the axial direction.

Download Full-text

Segregation in fusion weld of 2219 aluminum alloy and its influence on mechanical properties of weld

Transactions of Nonferrous Metals Society of China ◽

10.1016/s1003-6326(17)60030-x ◽

2017 ◽

Vol 27 (2) ◽

pp. 258-271 ◽

Cited By ~ 8

Author(s):

Quan LI ◽

Ai-ping WU ◽

Yan-jun LI ◽

Guo-qing WANG ◽

Bo-jin QI ◽

...

Keyword(s):

Mechanical Properties ◽

Aluminum Alloy ◽

2219 Aluminum Alloy ◽

Fusion Weld

Download Full-text

Effect of welding speed on microstructures and mechanical properties of underwater friction stir welded 2219 aluminum alloy

Materials & Design (1980-2015) ◽

10.1016/j.matdes.2010.09.032 ◽

2011 ◽

Vol 32 (3) ◽

pp. 1548-1553 ◽

Cited By ~ 103

Author(s):

H.J. Liu ◽

H.J. Zhang ◽

L. Yu

Keyword(s):

Mechanical Properties ◽

Aluminum Alloy ◽

Welding Speed ◽

Friction Stir ◽

2219 Aluminum Alloy ◽

Microstructures And Mechanical Properties

Download Full-text

Effect of Nanometer Magnesium Oxide Addition on the Cast Microstructure of X80 Pipeline Steel

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.401-403.610 ◽

2013 ◽

Vol 401-403 ◽

pp. 610-613

Author(s):

Jian Ming Wang ◽

Yang Liu ◽

Yan Liu ◽

Qian He Ma

Keyword(s):

Mechanical Properties ◽

Thermal Stability ◽

Magnesium Oxide ◽

Pipeline Steel ◽

Harsh Environment ◽

Second Phase ◽

X80 Pipeline Steel ◽

Oxide Addition ◽

Second Phase Particles ◽

Cast Microstructure

The pipeline steel as an application in pipeline construction must have good comprehensive mechanical properties due to the harsh environment of the pipeline engineering. So this experiment takes the X80 pipeline steel as the research object, the thermal stability second phase particles which would not be dissolved or aggregated at high temperature will be expected by means of adding nanomagnesium oxide into the steel with the method of carrier dispersion addition. The effect of nanometer magnesium oxide addition on the cast microstructure of X80 pipeline steel was analysed. The results show that the cast microstructure is consist of the ferrite and a small amount bainite. And the bainite is distributed at the boundary of the ferrite grains. When adding 0.02 wt% nanometer magnesium oxides, the number of bainite increases significantly in the cast microstructure, which is mostly distributed at the boundary of the ferrite grains.

Download Full-text

Role of second-phase particles in the microstructural evolution and mechanical properties of extruded Mg-Gd-Y-Ag-Zr alloys

Materials Today Communications ◽

10.1016/j.mtcomm.2020.100956 ◽

2020 ◽

Vol 24 ◽

pp. 100956

Author(s):

Fan Zhang ◽

Yafei Wang ◽

Yunbiao Duan ◽

Kaijun Wang ◽

Yutian Wang ◽

...

Keyword(s):

Mechanical Properties ◽

Microstructural Evolution ◽

Second Phase ◽

Second Phase Particles ◽

Zr Alloys

Download Full-text

Adsorption Behavior of GTMS on AA2024-T3 Aluminum Alloy and the Application on Surface Pretreatment

Materials Science Forum ◽

10.4028/www.scientific.net/msf.984.31 ◽

2020 ◽

Vol 984 ◽

pp. 31-42

Author(s):

Bing Xue ◽

Xue Mei Zong ◽

Can Wang ◽

Hua Yuan Zhang ◽

Jing Luo

Keyword(s):

Aluminum Alloy ◽

Selective Adsorption ◽

Surface Condition ◽

Sol Gel ◽

Adsorption Behavior ◽

Second Phase ◽

Surface Pretreatment ◽

Pretreatment Method ◽

Second Phase Particles ◽

Sol Gel Films

Basing on the study of adsorption behavior of glycidoxypropyl-trimethoxy-silane (GTMS), pretreatment method of AA2024-T3 aluminum alloy for sol-gel films was optimized. The morphology, composition and corrosion protective performance of alloy coated with the films were investigated by using FE-SEM, EDS, AFM and EIS. The results showed that the Al matrix exhibited better ability to adsorb GTMS molecules than the second phase particles, especially at lower concentration of GTMS. Further, the 5% GTMS films cover the whole surface, but the selective adsorption behaviors still exist. It was concluded that less second phase particles and smoother surface were benefit to the sol-gel films on aluminum alloy. Depending on this conclusion, the pretreatment method for sol-gel films was optimized. The optimized surface condition conducted with 50 g•L-1 sodium hydroxide and ultrasound at 60 oC for 30 s was obtained. These samples coated with the sol-gel films revealed good anti-corrosion performance. The coverage degree of the films was up to 97.95 %.

Download Full-text

Alloying and Processing Effects on the Microstructure, Mechanical Properties, and Degradation Behavior of Extruded Magnesium Alloys Containing Calcium, Cerium, or Silver

Materials ◽

10.3390/ma13020391 ◽

2020 ◽

Vol 13 (2) ◽

pp. 391 ◽

Cited By ~ 6

Author(s):

Jan Bohlen ◽

Sebastian Meyer ◽

Björn Wiese ◽

Bérengère J. C. Luthringer-Feyerabend ◽

Regine Willumeit-Römer ◽

...

Keyword(s):

Mechanical Properties ◽

Magnesium Alloys ◽

Processing Parameters ◽

Second Phase ◽

Degradation Behavior ◽

Microstructure Development ◽

Corrosion Properties ◽

Second Phase Particles ◽

Degradation Rates ◽

The Relationship

Magnesium alloys attract attention as degradable implant materials due to their adjustable corrosion properties and biocompatibility. In the last few decades, especially wrought magnesium alloys with enhanced mechanical properties have been developed, with the main aim of increasing ductility and formability. Alloying and processing studies allowed demonstrating the relationship between the processing and the microstructure development for many new magnesium alloys. Based on this experience, magnesium alloy compositions need adjustment to elements improving mechanical properties while being suitable for biomaterial applications. In this work, magnesium alloys from two Mg-Zn series with Ce (ZE) or Ca (ZX) as additional elements and a series of alloys with Ag and Ca (QX) as alloying elements are suggested. The microstructure development was studied after the extrusion of round bars with varied processing parameters and was related to the mechanical properties and the degradation behavior of the alloys. Grain refinement and texture weakening mechanisms could be improved based on the alloy composition for enhancing the mechanical properties. Degradation rates largely depended on the nature of second phase particles rather than on the grain size, but remained suitable for biological applications. Furthermore, all alloy compositions exhibited promising cytocompatibility.

Download Full-text