Investigation on the Effect of Geometrical Shape of Cold Direct Extrusion on Commercially Pure Aluminum Alloyed by 4% Cu

2015 ◽  
Vol 1105 ◽  
pp. 182-189 ◽  
Author(s):  
Adnan I.O. Zaid ◽  
S.M.A. Al-Qawabah
Keyword(s):  
Mechanical Behavior ◽  
Pure Aluminum ◽  
Extrusion Process ◽  
Control Area ◽  
Geometrical Shape ◽  
Compression Tests ◽  
Maximum Enhancement ◽  
Cross Sectional ◽  
Direct Extrusion ◽  
Cu Alloy

Al-4% Cu alloys are now widely used in many engineering applications especially in robotic, aerospace and vibration control area. The main problem arises from the weakness of their mechanical characteristics. Therefore, this study is directed towards enhancing the mechanical properties through severe plastic deformation, hence it is anticipated that cold direct extrusion process may enhance their mechanical behavior. This was performed through using three different cross sectional dies namely; circular, square, and rectangular that have the same cross sectional area. The general microstructure, microhardness, and compression tests were performed on each specimen produced before and after extrusion for Al and Al-4% Cu alloy. It was found that the maximum enhancement in mechanical behavior was achieved after extrusion through the rectangular shape for both Al and Al-4% Cu alloy at 0.2 strain by 143% for Al and 134.8% for Al-4%Cu wt.; similarly the hardness of both of them was improved where a maximum of 141.8 % was obtained for Al-4% Cu wt. in case of rectangular cross sectional die.

scholarly journals Complex interactions between precipitation, grain growth and recrystallization in a severely deformed Al-Zn-Mg-Cu alloy and consequences on the mechanical behavior

Materialia ◽  
2021 ◽  
Vol 15 ◽  
pp. 101028
Author(s):  
Amandine Duchaussoy ◽  
Xavier Sauvage ◽  
Alexis Deschamps ◽  
Frederic De Geuser ◽  
Gilles Renou ◽  
...  
Keyword(s):  
Mechanical Behavior ◽  
Grain Growth ◽  
Complex Interactions ◽  
Cu Alloy

scholarly journals Mechanical behavior of frozen soil improved with sulphoaluminate cement and its microscopic mechanism

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Zhenhua Yin ◽  
Hu Zhang ◽  
Jianming Zhang ◽  
Mingtang Chai
Keyword(s):  
Mechanical Properties ◽  
Mechanical Behavior ◽  
Soil Improvement ◽  
Particle Size Analysis ◽  
Frozen Soil ◽  
Size Analysis ◽  
Permafrost Soil ◽  
Compression Tests ◽  
Microscopic Mechanism ◽  
Sulphoaluminate Cement

Abstract The foundation of constructions built in the permafrost areas undergo considerable creeping or thawing deformation because of the underlying ice-rich permafrost. Soil improvement may be of advantage in treating ice-rich permafrost at shallow depth. Sulphoaluminate cement was a potential material to improve frozen soil. Simultaneously, two other cements, ordinary Portland cement and Magnesium phosphate cement were selected as the comparison. The mechanical behavior of modified frozen soil was studied with thaw compression tests and unconfined compression strength tests. Meanwhile, the microscopic mechanism was explored by field emission scanning electron microscopy, particle size analysis and X-ray diffractometry. The results showed Sulphoaluminate cement was useful in reducing the thaw compression deformation and in enhancing the strength of the frozen soil. The improvement of the mechanical behavior depended mainly on two aspects: the formation of structural mineral crystals and the agglomeration of soil particles. The two main factors contributed to the improvement of mechanical properties simultaneously. The thicker AFt crystals result in a higher strength and AFt plays an important role in improving the mechanical properties of frozen soils.The study verified that Sulphoaluminate cement was an excellent stabilizer to improve ice-rich frozen soils.

Microstructures and Mechanical Behavior of Bulk Nanocrystalline γ–Ni–Fe Produced by a Mechanochemical Method

2002 ◽  
Vol 17 (5) ◽  
pp. 991-1001 ◽  
Author(s):  
X. Y. Qin ◽  
J. S. Lee ◽  
C. S. Lee
Keyword(s):  
Yield Strength ◽  
Mechanical Behavior ◽  
Light Emission ◽  
Hot Isostatic Pressing ◽  
Microstructural Analysis ◽  
High Strength ◽  
Compression Tests ◽  
Mechanochemical Method ◽  
Force Microscopy ◽  
Bulk Nanocrystalline

The microstructures and mechanical behavior of bulk nanocrystalline γ–Ni–xFe (n-Ni–Fe) with x = ∼19–21 wt%, synthesized by a mechanochemical method plus hot-isostatic pressing, were investigated using microstructural analysis [x-ray diffraction, energy-dispersive spectroscopy, light emission spectrum, atomic force microscopy (AFM), and optical microscopy (OM)], and mechanical (indentation and compression) tests, respectively. The results indicated that the yield strength (σ0.2) of n-Ni–Fe (d ∼ 33 nm) is about 13 times greater than that of conventional counterpart. The change of yield strength with grain size was basically in agreement with Hall–Petch relation in the size range (33–100 nm) investigated. OM observations demonstrated the existence of two sets of macroscopic bandlike deformation traces mostly orienting at 45–55° to the compression axis, while AFM observations revealed that these bandlike traces consist of ultrafine lines. The cause for high strength and the possible deformation mechanisms were discussed based on the characteristics of microstructures and deformation morphology of n-Ni–Fe.

scholarly journals Comparison of Mechanical Behavior and Acoustic Emission Characteristics of Three Thermally-Damaged Rocks

Energies ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 2350 ◽  
Author(s):  
Jun Peng ◽  
Sheng-Qi Yang
Keyword(s):  
Mechanical Properties ◽  
Acoustic Emission ◽  
Mechanical Behavior ◽  
Thermal Damage ◽  
Strain Curve ◽  
Treatment Temperature ◽  
P Wave ◽  
High Temperature Treatment ◽  
High Porosity ◽  
Compression Tests

High temperature treatment has a significant influence on the mechanical behavior and the associated microcracking characteristic of rocks. A good understanding of the thermal damage effects on rock behavior is helpful for design and stability evaluation of engineering structures in the geothermal field. This paper studies the mechanical behavior and the acoustic emission (AE) characteristic of three typical rocks (i.e., sedimentary, metamorphic, and igneous), with an emphasis on how the difference in rock type (i.e., porosity and mineralogical composition) affects the rock behavior in response to thermal damage. Compression tests are carried out on rock specimens which are thermally damaged and AE monitoring is conducted during the compression tests. The mechanical properties including P-wave velocity, compressive strength, and Young’s modulus for the three rocks are found to generally show a decreasing trend as the temperature applied to the rock increases. However, these mechanical properties for quartz sandstone first increase to a certain extent and then decrease as the treatment temperature increases, which is mainly attributed to the high porosity of quartz sandstone. The results obtained from stress–strain curve, failure mode, and AE characteristic also show that the failure of quartz-rich rock (i.e., quartz sandstone and granite) is more brittle when compared with that of calcite-rich rock (i.e., marble). However, the ductility is enhanced to some extent as the treatment temperature increases for all the three examined rocks. Due to high brittleness of quartz sandstone and granite, more AE activities can be detected during loading and the recorded AE activities mostly accumulate when the stress approaches the peak strength, which is quite different from the results of marble.

On the mechanical behavior of a cryomilled Al–Ti–Cu alloy

2003 ◽  
Vol 358 (1-2) ◽  
pp. 318-323 ◽  
Author(s):  
Bing Q. Han ◽  
Enrique J. Lavernia ◽  
Farghalli A. Mohamed
Keyword(s):  
Mechanical Behavior ◽  
Cu Alloy

scholarly journals Formation of the Equiaxed Grains in Pure Aluminum and Al-0.2%Cu Alloy Ingots

1970 ◽  
Vol 34 (8) ◽  
pp. 802-807
Author(s):  
Akira Suzuki ◽  
Jitsuhito Nakamura ◽  
Toshimasa Sakamoto
Keyword(s):  
Pure Aluminum ◽  
Cu Alloy ◽  
Equiaxed Grains

scholarly journals Correlation study of Carbon Monoxide (CO) air exposure level with blood COHb level of Basement Officer in Surabaya Mall

2019 ◽  
Vol 11 (3) ◽  
pp. 225
Author(s):  
Safiatur Nur Rohmah
Keyword(s):  
Carbon Monoxide ◽  
Quality Standard ◽  
Control Area ◽  
Control Group ◽  
Exposure Level ◽  
Cross Sectional ◽  
Air Exposure ◽  
Cohb Level ◽  
Car Park ◽  
Co Gas

Gas CO is formed as a result of incomplete combustion. The material containing carbon monoxide is gas emission from motorcycle vehicle which is toxic to humans. This study aims to analyze the correlation between CO gas that also known as Carbon monoxide gas in the air with COHb level of blood parking basement officers in Surabaya "x" mall. This study was analytical observational with cross sectional design and the data was analyzed by Chi-Square test. The number of samples used was 15 parking basement officers and a control group of 15 people as a comparison. The results of measurement of CO gas levels in 3 parking points were more than standards recommendation. While the other 3 points in the control area were below the quality standard. All of samples in the parking basement officers had COHb levels >5% and for control areas there were 11 persons who had COHb levels of <5% and 4 people who had COHb levels of >5%. The results suggested that there was a significant correlation between the characteristics of individuals with COHb levels, such as duration of work (p = 0.040), nutritional status (p = 0.047) and smoking habits (p = 0.046). While variable of age (p = 0.070) and personal protective equipment (PPE) use (p = 0.128) showed no significant correlation. In addition, there was a significant correlation between exposure of CO gas and blood COHb levels in basement car park officers in Surabaya “X” Mall (p = 0.000), and there was a distinction between COHb level of blood basement car park officers in the "x" mall building and the control group with a value of p = 0.000. Based on the results, it is suggested for car park officers to cease smoking, go to places with more oxygen, maintain diet and do exercise regularly. It is also suggested and recommended for agencies is to put more attention regarding exhaust fans’ maintenance and sufficiency. 

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