Microstructural and Mechanical Properties of Al 7003 Alloy Processed by Dual Equal Channel Lateral Extrusion

2014 ◽  
Vol 852 ◽  
pp. 214-218
Author(s):  
Zhao Hua Liu ◽  
Hua Rong Qi ◽  
Xiao Wang ◽  
Shi Qi ◽  
Nan Qing
Keyword(s):  
Mechanical Properties ◽  
Tensile Yield Strength ◽  
Strength Increase ◽  
Deformation Bands ◽  
Lateral Extrusion ◽  
Elongation To Failure ◽  
Dislocation Cells ◽  
Average Size ◽  
Tensile Strength Increase ◽  
Ultimate Tensile Strength Increase

In this paper, the Al 7003 alloy in the as-annealed condition was processed by dual equal channel lateral extrusion (DECLE) at room temperature. The microstructure and mechanical properties of the as-annealed and DECLEed alloys were examined. The results showed that the microstructure of as-annealed Al 7003 alloys was refined by the formation of deformation bands, with dislocation cells and subgrains inside these bands. The final grains with an average size of about 250nm are observed. Due to DECLE, tensile yield strength and ultimate tensile strength increase by 84.5%, 35.4%, respectively. Meanwhile, elongation to failure decreases by 40.4%. The fracture was characterized by ductile fracture due to existence of a large number of dimples.

Determination of mechanical properties of two-phase and hybrid nanocomposites: experimental determination and multiscale modeling

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Mahmoud Haghighi ◽  
Hossein Golestanian ◽  
Farshid Aghadavoudi
Keyword(s):  
Mechanical Properties ◽  
Ultimate Strength ◽  
Multiscale Modeling ◽  
Filler Content ◽  
Hybrid Nanocomposites ◽  
Dynamics Simulation ◽  
Strength Increase ◽  
Two Phase ◽  
Macro Scale ◽  
Elongation To Failure

Abstract In this paper, the effects of filler content and the use of hybrid nanofillers on agglomeration and nanocomposite mechanical properties such as elastic moduli, ultimate strength and elongation to failure are investigated experimentally. In addition, thermoset epoxy-based two-phase and hybrid nanocomposites are simulated using multiscale modeling techniques. First, molecular dynamics simulation is carried out at nanoscale considering the interphase. Next, finite element method and micromechanical modeling are used for micro and macro scale modeling of nanocomposites. Nanocomposite samples containing carbon nanotubes, graphene nanoplatelets, and hybrid nanofillers with different filler contents are prepared and are tested. Also, field emission scanning electron microscopy is used to take micrographs from samples’ fracture surfaces. The results indicate that in two-phase nanocomposites, elastic modulus and ultimate strength increase while nanocomposite elongation to failure decreases with reinforcement weight fraction. In addition, nanofiller agglomeration occurred at high nanofiller contents especially higher than 0.75 wt% in the two-phase nanocomposites. Nanofiller agglomeration was observed to be much lower in the hybrid nanocomposite samples. Therefore, using hybrid nanofillers delays/prevents agglomeration and improves mechanical properties of nanocomposite at the same total filler content.

scholarly journals The Effect of Extrusion Temperatures on Microstructure and Mechanical Properties of Mg-1.3Zn-0.5Ca (wt.%) Alloys

Crystals ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 1228
Author(s):  
Honglin Zhang ◽  
Zhigang Xu ◽  
Laszlo J. Kecskes ◽  
Sergey Yarmolenko ◽  
Jagannathan Sankar
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Yield Strength ◽  
Volume Fraction ◽  
Fiber Texture ◽  
Extrusion Ratio ◽  
Tensile Yield Strength ◽  
Microstructure And Mechanical Properties ◽  
Average Size

The present work mainly investigated the effect of extrusion temperatures on the microstructure and mechanical properties of Mg-1.3Zn-0.5Ca (wt.%) alloys. The alloys were subjected to extrusion at 300 °C, 350 °C, and 400 °C with an extrusion ratio of 9.37. The results demonstrated that both the average size and volume fraction of dynamic recrystallized (DRXed) grains increased with increasing extrusion temperature (DRXed fractions of 0.43, 0.61, and 0.97 for 300 °C, 350 °C, and 400 °C, respectively). Moreover, the as-extruded alloys exhibited a typical basal fiber texture. The alloy extruded at 300 °C had a microstructure composed of fine DRXed grains of ~1.54 µm and strongly textured elongated unDRXed grains. It also had an ultimate tensile strength (UTS) of 355 MPa, tensile yield strength (TYS) of 284 MPa, and an elongation (EL) of 5.7%. In contrast, after extrusion at 400 °C, the microstructure was almost completely DRXed with a greatly weakened texture, resulting in an improved EL of 15.1% and UTS of 274 MPa, TYS of 220 MPa. At the intermediate temperature of 350 °C, the alloy had a UTS of 298 MPa, TYS of 234 MPa, and EL of 12.8%.

Effect of Fiber Loading on the Mechanical Properties of Millet Husk Filled High Density Polyethylene Composites

2014 ◽  
Vol 564 ◽  
pp. 350-354 ◽  
Author(s):  
Abba A. Hammajam ◽  
Z.N. Ismarrubie ◽  
S.M. Sapuan
Keyword(s):  
Mechanical Properties ◽  
High Density Polyethylene ◽  
Testing Machine ◽  
High Density ◽  
Thermoplastic Composites ◽  
Strength Increase ◽  
Molding Process ◽  
High Fiber ◽  
Fiber Loading ◽  
Tensile Strength Increase

The aim of this study is to determine the effect of fiber loading on the mechanical properties of millet husk (MH) filled high density polyethylene (HDPE) thermoplastic composites. Three different fiber sizes; 250 μm, 500 μm and 750 μm were pulverized and the fiber loading was 10 %, 20 %, 30 % and 40% by weight. The MH-HDPE composites were prepared by application of internal mixer, accompanied by compression molding process. Tensile properties were tested using universal testing machine (UTM). The tensile strength increase from 0 % to 10 % by weight fiber loadings. But this strength decrease as the fiber loading increase, while the modulus increase as the loadings increases. At 30 % fiber loadings, the strength of the composites decrease for high fiber sizes of 500 μm and 750 μm and increases for small fiber sizes of 250 μm for both the composites strength and modulus . This is presume the maximum loading for MHHDPE composites.

Elimination of Shrinkage Cavities by Liquid Hot Isostatic Pressing in Aluminum Alloys under Superplastic Conditions

2016 ◽  
Vol 838-839 ◽  
pp. 261-266
Author(s):  
Damir Tagirov ◽  
Rustam Kaibyshev
Keyword(s):  
Hot Isostatic Pressing ◽  
Total Elongation ◽  
Strength Increase ◽  
Remarkable Improvement ◽  
Die Cast ◽  
Yield Stress Increase ◽  
Shrinkage Cavities ◽  
Tensile Strength Increase ◽  
Ultimate Tensile Strength Increase ◽  
Fracture Toughness Increase

The liquid hot isostatic pressure in superplastic conditions was applied to eliminate macroporosity in a die cast Al-12%Si eutectic alloy. The removing of macroporosity provides the yield stress increase of 56%, the ultimate tensile strength increase of 46%, the total elongation increase of 21%, the fracture toughness increase of 340% and the fatigue strength increase of 58%. Remarkable improvement of mechanical properties is caused by suppression of crack initiation on internal coarse pores.

Influence of Nickel on the Microstructure and Mechanical Properties of Nodular Cast Iron

2021 ◽  
Vol 1023 ◽  
pp. 61-66
Author(s):  
Watsada Siripongtana ◽  
Rungsinee Canyook
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Cast Iron ◽  
Ductile Iron ◽  
Nickel Content ◽  
Nodular Cast Iron ◽  
Strength Increase ◽  
Microstructure And Mechanical Properties ◽  
Nickel Addition ◽  
Tensile Strength Increase

This research investigates the nickel content added by 1.1wt%, 2.2wt%, 3.7wt% and 4.5wt% on the microstructure and mechanical properties in the nodular cast iron. The results demonstrate that the microstructure of nickel addition consists of nodule graphite, ferrite and pearlite phase while nickel was added to 4.5 wt% the microstructure becomes ferrite transform to fully pearlite phase. In addition the ductile iron has the highest nodularity (0.79%), followed by 1.1%Ni (0.75%), 2.2%Ni (0.71%), 3.7%Ni (0.69%) and 4.5%Ni (0.58%). The hardness and tensile strength increase when increasing the nickel content. Elongation is enhanced with nickel increasing and reaches a maximum of 12% at 1.1 wt% Ni, then decreases with the further increase of nickel.

Microstructure and Mechanical Properties of Mg-3Y Binary Alloy Processed by Cyclic Extrusion and Compression

2010 ◽  
Vol 667-669 ◽  
pp. 767-771
Author(s):  
Xin Tao Liu ◽  
Man Ping Liu ◽  
Qu Dong Wang ◽  
Wei Guo ◽  
Dong Di Yin
Keyword(s):  
Mechanical Properties ◽  
Room Temperature ◽  
Initial Strain Rate ◽  
Tensile Yield Strength ◽  
Strength Differential ◽  
Mean Grain Size ◽  
Different Temperatures ◽  
Elongation To Failure ◽  
The Mean ◽  
Compressive Tests

Mg-3wt.%Y alloys were processed by cyclic extrusion and compression (CEC) up to 7 passes at different temperatures from 375 to 450 °C, respectively. The microstructure was effectively refined and the mean grain size was decreased from 800 μm to 3–15 μm. Tensile and compressive tests were performed at room temperature at an initial strain rate of 1.11 × 10-3 s-1. The experimental results show that after 7-pass CEC processing the tensile yield strength and elongation-to-failure of Mg-3Y alloy increased simultaneously. Furthermore, the strength differential effect (SDE) of tension-compression of the alloy was weakened, especially the SDE value was only 3.3% when processed at 400 °C.

scholarly journals Friction Stir Welded AA5052-H32 under Dissimilar Pin Profile and Preheat Temperature: Microstructural Observations and Mechanical Properties

Metals ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 4
Author(s):  
Nurul Muhayat ◽  
Mulyadi Sinung Harjono ◽  
Yohanes Pringeten Dilianto Sembiring Depari ◽  
Aditya Rio Prabowo ◽  
Triyono Triyono ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Strength Increase ◽  
Preheat Temperature ◽  
Friction Stir ◽  
Hardness Increase ◽  
And Performance ◽  
Joint Quality ◽  
Tensile Strength Increase ◽  
Tool Pin

In order to meet the escalating demand in the shipbuilding business, suitable materials with enhanced qualities are required to maximize ship cargo while reducing fuel consumption. Aluminum (Al) and its alloys are competing contenders for use in a variety of complicated ship structures. The major challenge to enhancing joint quality and performance is the quest for a viable and efficient FSW parameter. The main focus of this study was to critically explore the effect of the tool pin profile and the preheat temperature used during the friction stir welding of AA 5052-H32 on its mechanical properties and weld microstructure characteristics. There are three pin profile variations, including samples that were cylindrical, samples with two flat sides, and samples with three flat sides, all of which were investigated in different preheat temperatures (150–300 °C). The results that were obtained during macrographic observation showed that tunnel defects were visible in the cylindrical and two-flat-sided pin profile designs. During observations of the microstructure, it was observed that the grain size became finer and smaller in the weld nugget compared to in the heat affected zone (HAZ) and thermo-mechanically affected zone (TMAZ) regions due to dynamic recrystallization. However, at the 300 °C preheat variation, the grain size appeared to be larger due to the slower cooling rate, causing a decrease in the mechanical properties of the samples. The results of the physical tests determined that the preheat temperature caused an increase in the mechanical properties until 250 °C, at which point the three-flat-sided pin profile tool demonstrated superior mechanical properties compared to the tools with a cylindrical design; a 12.2% tensile strength increase, a 15.3% and 9.4% face and root bending increase, and an 11.2% hardness increase were observed.

Microstructures and Mechanical Properties of Mg-10Gd-3Y-2Zn-0.5Zr Alloy

2014 ◽  
Vol 788 ◽  
pp. 122-126
Author(s):  
Yong Dong Xu ◽  
Jun Wang ◽  
Zhi Wen Shao ◽  
Rong Wang ◽  
Xiu Rong Zhu
Keyword(s):  
Mechanical Properties ◽  
Lamellar Structure ◽  
Cast Alloy ◽  
Hot Extrusion ◽  
Tensile Yield Strength ◽  
Long Period ◽  
Stacking Order ◽  
Peak Aged ◽  
Microstructures And Mechanical Properties ◽  
Average Size

Microstructures and mechanical properties of Mg-10Gd-3Y-2Zn-0.5Zr alloy were investigated. Three kinds of phases including Mg, Mg3(GdYZn) and Mg12(GdY)Zn were found in the as-cast alloy. Two different patterns of the long-period stacking order (LPSO) phases including lamellar structure and block-like structure were observed in the homogenized alloy and both of them were identified as the phase of Mg12(GdY)Zn. After extrusion with ratio of 10:1 under 420°C, fine dynamic recrystallized grains were obtained and its average size was only about 4μm. The alloy exhibited excellent mechanical properties by hot extrusion and heat treatment. The ultimate tensile strengths of the as-extruded and peak-aged alloys were 415MPa and 480MPa, the tensile yield strength were 335MPa and 410MPa, the elongations were 16% and 13.5%, respectively. The high mechanical properties were mainly attributed to the combined effects of fine grains, LPSO phases and the dispersed precipitates.

Effect of Liquid Hot Isostatic Pressing on Structure and Mechanical Properties of an Aluminum Alloy

2014 ◽  
Vol 794-796 ◽  
pp. 845-850 ◽  
Author(s):  
Damir Tagirov ◽  
Vladislav Kulitskiy ◽  
Nikolay Belov ◽  
Rustam Kaibyshev
Keyword(s):  
Mechanical Properties ◽  
Endurance Limit ◽  
Hot Isostatic Pressing ◽  
High Strength ◽  
Shrinkage Porosity ◽  
Eutectic Phase ◽  
Isostatic Pressing ◽  
Elongation To Failure ◽  
Average Size ◽  
Brittle Intergranular Fracture

The effect of liquid hot isostatic pressing (LHIP) on microstructure and mechanical properties of a high-strength cast Al-6Zn-2Mg-0.5Fe-0.7Ni alloy was examined. LHIP eliminates shrinkage porosity that highly improves strength and fatigue limit. Yield stress (YS) and ultimate tensile strength (UTS) in T6 condition increased from 135 to 470 MPa and from 410 to 510 MPa, respectively. Endurance limit on the base of 107 cycles increased from 95 to 140 MPa. However, a small number of gas pores with an average size less than 2 μm retains. LHIP suppresses the crack initiation on coarse cavities. However, brittle intergranular fracture occurs in the hipped alloy through the breaking of eutectic phase Al9FeNi. As a result, elongation-to-failure was of 1.2% and the fatigue strength is equal to one of AA356.02 alloy subjected to LHIP.

Particle Redistribution and Grain Refinement during Processing by Hydrostatic Extrusion

2008 ◽  
Vol 584-586 ◽  
pp. 541-546 ◽  
Author(s):  
Kinga Wawer ◽  
Małgorzata Lewandowska ◽  
Krzysztof Jan Kurzydlowski
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Tensile Strength ◽  
Grain Refinement ◽  
Hydrostatic Extrusion ◽  
Strength Increase ◽  
Two Phase ◽  
Size Refinement ◽  
Cast Alloys ◽  
Tensile Strength Increase

In this study particle redistribution and grain size refinement induced by hydrostatic extrusion (HE) have been studied in two Al-Si cast alloys (Al-9%Si and Al-11%Si). It has been found that HE results in a significant changes in particle shape, size and distribution which was revealed by SEM observations and quantified using stereological parameters. At the same time, significant grain refinement down to ~100 nm in diameter takes place in aluminium phase. Such a microstructure evolution affects substantially the mechanical properties of two-phase alloys. The yield strength and tensile strength increase over two times whereas the plasticity only slightly decreases.

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