scholarly journals Effect of chemical composition and quenching media on recoverable strain in Cu–Zn–Al alloys

2021 ◽  
Vol 12 ◽  
pp. 1368-1379
Author(s):  
Vanja Asanović ◽  
Dragan Radonjić ◽  
Jelena Šćepanović ◽  
Darko Vuksanović
Keyword(s):  
Chemical Composition ◽  
Al Alloys ◽  
Recoverable Strain ◽  
Quenching Media

The Analysis of Metallic Materials Subjected to Cycles of Thermal and Mechanical Fatigue

2016 ◽  
Vol 700 ◽  
pp. 78-85
Author(s):  
Dragoş Cristian Achiţei ◽  
Petrică Vizureanu ◽  
Mirabela Georgiana Minciună ◽  
Mohd Mustafa Al Bakri Abdullah ◽  
Andrei Victor Sandu
Keyword(s):  
Chemical Composition ◽  
Variable Number ◽  
Al Alloys ◽  
Metallic Materials ◽  
Thermal Mechanical Fatigue ◽  
Testing Installation ◽  
Mechanical Fatigue ◽  
Corrosion Phenomenon ◽  
Micro Cracks ◽  
Number Of Cycles

The paper present theoretical and practical aspects concerning to the phenomena of thermal / mechanical fatigue specific to metallic materials, which are found in the structure of industrial parts, subjected to thermal and mechanical requests, also in combination with the corrosion phenomenon, pressure different etc. The analyzed alloys subjected to thermal and mechanical fatigue requests, on a prototype testing installation, using samples from Cu-Zn-Al alloys, which have been processed at standard dimensions by machining. Function of chemical composition of alloy, after a variable number of cycles it was found the micro-cracks appearance that generates crack and finally the break of samples. The SEM realized at different magnifications, highlight the character of samples break.

Microstructure Evolution of Zn-Al Cladding Fabricated on AZ31 Magnesium Alloy

2014 ◽  
Vol 1004-1005 ◽  
pp. 154-157
Author(s):  
An Sun ◽  
Xiao Ming Sui ◽  
Hai Tao Li ◽  
Qiang Wang
Keyword(s):  
Solid Solution ◽  
Chemical Composition ◽  
Microstructure Evolution ◽  
Element Concentration ◽  
Transverse Section ◽  
Eutectic Structure ◽  
Al Alloys ◽  
Magnesium Atom ◽  
Evolution Phase ◽  
Bonding Zone

The surface of AZ31 magnesium substrate is coated by Zn-Al alloys using cast-penetrated cladding. The transverse section of alloy cladding is composed of cladding zone, diffusional zone, and bonding zone. The microstructure evolution, phase constitution, and chemical composition of the transition layer are studied. The experimental results exhibit cladding zone contained dendrite matrix and interdendritic eutectic structures. The plume eutectic structure and columnar eutectic structure are formed in diffusional zone and bonding zone, respectively. Zn and Al solid solutions gradually decrease and disappear owing to the diffusion of magnesium atom and the changes of magnesium element concentration. Mg7Zn3 phases are generated rapidly due to the interdiffusion of zinc and magnesium atoms rapidly in the diffusional zone and bonding zone. As Mg-Zn eutectic phases hinder the movement of Mg and Al atoms, the Mg-Al intermetallic compounds are eliminated completely. The microstructure is transformed into Mg solid solution and Mg7Zn3 eutectic structure to combine with AZ31 base metal.

Geometric and Chemical Composition Effects on Healing Kinetics of Voids in Mg-bearing Al Alloys

2016 ◽  
Vol 47 (5) ◽  
pp. 2410-2420 ◽  
Author(s):  
Miao Song ◽  
Kui Du ◽  
Chunyang Wang ◽  
Shengping Wen ◽  
Hui Huang ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Al Alloys ◽  
Composition Effects ◽  
Kinetics Of

scholarly journals Metallurgical Preparation of Nb–Al and W–Al Intermetallic Compounds and Characterization of Their Microstructure and Phase Transformations by DTA Technique

Molecules ◽  
2020 ◽  
Vol 25 (8) ◽  
pp. 2001
Author(s):  
Tomas Cegan ◽  
Daniel Petlak ◽  
Katerina Skotnicova ◽  
Jan Jurica ◽  
Bedrich Smetana ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Intermetallic Compounds ◽  
Intermetallic Phase ◽  
Intermetallic Phases ◽  
Al Alloys ◽  
Vacuum Induction Melting ◽  
Al Alloy ◽  
Induction Melting ◽  
Arc Melting

The possibilities of metallurgical preparation of 40Nb-60Al and 15W-85Al intermetallic compounds (in at.%) by plasma arc melting (PAM) and vacuum induction melting (VIM) were studied. Both methods allow easy preparation of Nb–Al alloys; however, significant evaporation of Al was observed during the melting, which affected the resulting chemical composition. The preparation of W–Al alloys was more problematic because there was no complete re-melting of W during PAM and VIM. However, the combination of PAM and VIM allowed the preparation of W–Al alloy without any non-melted parts. The microstructure of Nb–Al alloys consisted of Nb2Al and NbAl3 intermetallic phases, and W–Al alloys consisted mainly of needle-like WAl4 intermetallic phase and Al matrix. The effects of melting conditions on chemical composition, homogeneity, and microstructure were determined. Differential thermal analysis was used to determine melting and phase transformation temperatures of the prepared alloys.

Effects of chemical composition on the corrosion behavior of A7N01S-T5 Al alloys

2015 ◽  
Vol 29 (10n11) ◽  
pp. 1540025 ◽  
Author(s):  
Xiaomin Wang ◽  
Xiaoyao Liao ◽  
Chuanping Ma ◽  
Shufang Zhang ◽  
Yan Liu ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Corrosion Behavior ◽  
Corrosion Current ◽  
Al Alloys ◽  
Chemical Compositions ◽  
Al Alloy ◽  
Electrochemical Test ◽  
Electrochemical Behaviors ◽  
Cu Content ◽  
Corrosion Pits

Corrosion behavior of 7N01 Al alloy is sensitive to chemical composition. In this paper, stress corrosion cracking (SCC) and electrochemical behaviors of A7N01S-T5 Al alloys with three different chemical compositions were investigated. The corrosion weight loss and corrosion pits depth statistics showed that Alloy #3 (4.53 wt .% Zn , 1.27% Mg , < 0.001% Cu , 0.24% Cr , 0.15% Zr ) possesses the best anti-SCC property, while Alloy #1 (4.54% Zn , 1.09% Mg , 0.102% Cu , 0.25% Cr , 0.15% Zr ) was the weakest one. The different SCC susceptibility was mainly related to the Cu content as Alloy #3 contains higher Cu than Alloys #1 and #2. Electrochemical test result showed that Alloy #3 has higher corrosion potential and lower corrosion current density than Alloys #1 and #2. It is believed that a trace Cu can significantly improve the SC resistance of Al alloy, mainly because that Cu element can reduce the potential difference between grain inside and grain boundaries.

scholarly journals Effect of chemical composition and grain size on RT superplasticity of Zn-Al alloys processed by ECAP

2015 ◽  
Vol 5 (3) ◽  
pp. 328-334 ◽  
Author(s):  
M. Demirtas ◽  
G. Purcek ◽  
H. Yanar ◽  
Z. J. Zhang ◽  
Z. F. Zhang
Keyword(s):  
Grain Size ◽  
Chemical Composition ◽  
Al Alloys

scholarly journals Study On Nanohardness Of Phases Occurring In ZnAl22Cu3 And ZnAl40Cu3 Alloys

2015 ◽  
Vol 60 (2) ◽  
pp. 621-626 ◽  
Author(s):  
R. Michalik ◽  
B. Chmiela
Keyword(s):  
Chemical Composition ◽  
Al Alloys ◽  
Damping Properties ◽  
Cu Alloys ◽  
Cast Alloys

Abstract Zn-Al alloys are mainly used due to their high tribological and damping properties. A very important issue is determination of the hardness of the phases present in the Zn-Al-Cu alloys. Unfortunately, in literature there is lack of studies on the hardness of the phases present in the alloys Zn-Al-Cu. The aim of this research was to determine the hardness of the phases present in the ZnAl22Cu3Si and ZnAl40Cu3Si alloys. The scope of the research included examination of the structure, chemical composition of selected micro-regions and hardness of phases present in the examined alloys. The research carried out has shown, that CuZn4 phase is characterized by a similar hardness as the hardness of the interdendritic areas. The phases present in the structure of ZnAl40Cu3 and ZnAl22Cu3 alloys after soaking at the temperature of 185 °C are characterized by lower hardness than the phase present in the structure of the as-cast alloys.

The Origin of the Moon

1962 ◽  
Vol 14 ◽  
pp. 149-155 ◽  
Author(s):  
E. L. Ruskol
Keyword(s):  
Chemical Composition ◽  
Solar System ◽  
The Moon ◽  
The Earth ◽  
The Difference ◽  
Origin Of The Moon

The difference between average densities of the Moon and Earth was interpreted in the preceding report by Professor H. Urey as indicating a difference in their chemical composition. Therefore, Urey assumes the Moon's formation to have taken place far away from the Earth, under conditions differing substantially from the conditions of Earth's formation. In such a case, the Earth should have captured the Moon. As is admitted by Professor Urey himself, such a capture is a very improbable event. In addition, an assumption that the “lunar” dimensions were representative of protoplanetary bodies in the entire solar system encounters great difficulties.

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