Mechanical Properties of Large-Scale Extruded Mg-Zn-Y Alloys

2010 ◽  
Vol 638-642 ◽  
pp. 1541-1545 ◽  
Author(s):  
Yuichi Ienaga
Keyword(s):  
Mechanical Properties ◽  
Fatigue Strength ◽  
Aluminum Alloys ◽  
Large Scale ◽  
High Strength ◽  
Casting Process ◽  
High Heat ◽  
Stir Casting ◽  
Extrusion Ratio ◽  
High Heat Resistance

In order to realize large-scale Mg-Zn-Y alloys with high strength and high heat resistance, we have developed a unique casting process to produce a large homogeneous ingot investigating the mechanical properties of the extruded alloys. First homogeneous ingots (335 mm x 850 mm) were prepared by a unique stir casting process. Then large-scale extruded alloys (100 mm) were prepared at 648 K with the extrusion ratio of 10. The Mg-Zn-Y alloys have exhibited higher yield and fatigue strengths than those of aluminum alloys. The yield strengths of the aluminum alloys have decreased drastically above 473 K, whereas those of the Mg-Zn-Y alloys have not. It is noteworthy that the yield strength (200 MPa) and the fatigue strength (75 MPa) of the Mg-Zn-Y alloys at 523 K are about twice and 1.2-1.4 times as high as those of the aluminum alloys respectively. Moreover, the creep strengths have been equivalent or higher than those of aluminum alloys. From the above results, we have verified that even being made by the large-scale extrusion, the Mg-Zn-Y alloys possess higher strength than those of heat resistant aluminum alloys.

The Effect of Microalloying of Nickel, RRA Treatment on Microstructure and Mechanical Properties for High Strength Aluminum Alloy

2014 ◽  
Vol 925 ◽  
pp. 253-257 ◽  
Author(s):  
Haider T. Naeem ◽  
Kahtan S. Mohammad ◽  
Khairel R. Ahmad
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloys ◽  
High Strength ◽  
Casting Process ◽  
Direct Chill ◽  
Heat Treatments ◽  
Alloy Sample ◽  
Retrogression And Reaging ◽  
High Strength Aluminum Alloys ◽  
Direct Chill Casting Process

High strength aluminum alloys Al-Zn-Mg-Cu-(0.1) Ni produced by semi-direct chill casting process were homogenized at different conditions then conducted heat treatment process which comprised pre-aging at 120°C for 24 h, retrogression at 180°C for 30 min, and then re-aging at 120°C for 24 h. Microstructural studies showed that add Ni (0.1 wt %) to the alloy will be forming Ni-rich phases such as AlCuNi, AlNi, AlNiFe and AlMgNi which provide a dispersive strengthening affected in the solid-solution and the subsequent heat treatments. The results showed that by this three-step process of heat treatments, the mechanical properties of aluminum alloys Al-Zn-Mg-Cu-(0.1) Ni were substantially improved. The highest attain for the ultimate tensile strength and Vickers hardness for the alloy sample after applied the retrogression and reaging process is about 545 MPa and 237 HV respectively.

Microstructure and Mechanical Properties of Al Alloys by Semi-Solid Processing with LSPSF Technology

2009 ◽  
Vol 628-629 ◽  
pp. 477-482 ◽  
Author(s):  
Hong Min Guo ◽  
Xiang Jie Yang ◽  
J.X. Wang
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloys ◽  
Die Casting ◽  
High Strength ◽  
Casting Process ◽  
Homogeneous Distribution ◽  
Casting Alloy ◽  
Die Casting Process ◽  
Casting Industry ◽  
Semi Solid

Rheoforming is becoming the choice of the casting industry which relies on the semi-solid slurry for high integrity structural parts. The potential of rheoforming with LSPSF (Low superheat pouring with a shear field) for aluminum alloys was investigated in the present work. High quality semi-solid slurries of a series of aluminum alloys were manufactured by LSPSF process, such as casting alloy A356, high strength alloy 201, secondary die casting alloy A380 and wrought alloy 2024, 6082 and 7075, in which the primary α-Al presented spherical, small and homogeneous distribution, especially with zero-entrapped liquid. Applications of LSPSF in high pressure die casting process and squeeze casting process were presented. Results showed that LSPSF rheoforming could improve microstructures and increase mechanical properties.

scholarly journals Synthesis of Metal Matrix Composites through Stir Casting Process – a Review

2020 ◽  
Vol 22 (1) ◽  
pp. 357-370 ◽  
Author(s):  
S. Sakthivelu ◽  
P. P. Sethusundaram ◽  
M. Meignanamoorthy ◽  
M. Ravichandran
Keyword(s):  
Mechanical Properties ◽  
Metal Matrix Composites ◽  
Metal Matrix ◽  
Weight Ratio ◽  
High Strength ◽  
Casting Process ◽  
Stir Casting ◽  
Matrix Composites ◽  
Pure Metals ◽  
Engineering Materials

AbstractMetal is the one of the important material in engineering materials because of their high strength to weight ratio. However the pure metals cannot be used as engineering materials due to their ductile property. So, to improve their mechanical properties, some of the high strength materials (not metals) were added as reinforcement to improve the mechanical properties of pure metals and the newly developed material is called as metal matrix composites. At present, Aluminium, Copper, Magnesium, Titanium and Iron have been used as matrix materials and materials like TiC, SiC, B4C, WC, Cr3 C, TiO2, ZrO2, Gr, MoS2 and Si3N4 have been used as reinforcements. There are many processing techniques to fabricate metal matrix composites namely stir casting, ultra-sonic assisted casting, compo-casting, rheo casting, powder metallurgy technique, etc,. Among these, stir casting process is the most suitable and economical method to fabricate the metal matrix composites. In this article, an effort has been made to review the work of various researchers to fabricate metal matrix composites through stir casting process.

Characterization of physical and mechanical properties of aluminium based composites reinforced with titanium diboride particulates

2020 ◽  
pp. 002199832098080
Author(s):  
Dipankar Dey ◽  
Abhijit Bhowmik ◽  
Ajay Biswas
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Titanium Diboride ◽  
Microstructural Analysis ◽  
Physical And Mechanical Properties ◽  
High Strength ◽  
Casting Process ◽  
Matrix Alloy ◽  
Stir Casting ◽  
Sem Analysis

Particulate reinforced aluminium matrix composites are one of the most attractive approaches for applications where high strength and hardness combinations are necessary. The aspiration of this study is to investigate the effect of titanium diboride addition on physical and mechanical properties of Al2024-TiB2 composites manufactured using stir casting route, by varying the weight percentages (wt.%) (0, 3, 6 and 9 percent) of titanium diboride particulates. During the casting process, stirring time and speed were kept constant and same for all the composites. Microstructural analysis demonstrates uniformity in TiB2 distribution and also strong matrix-reinforcement bonding which can be as a result of magnesium addition and preheating of titanium diboride particles before incorporating into the molten aluminium. With an increment in the wt.% of TiB2 particulates, hardness and tensile strength of the prepared composites improved, a significant improvement in hardness as well as tensile strength is encountered in Al2024-9% TiB2 composite, which is 44.94% and 35.49% higher than Al2024 matrix alloy, respectively. SEM analysis of the fractured surfaces revealed that the mode of fracture of unreinforced material is purely ductile but reinforced material fractured by nucleation of cracks and plastic deformation.

Development of Seamless Pipe Based on Al/Al2O3 Composite Produced by Stir Casting and Centrifugal Casting

2016 ◽  
Vol 857 ◽  
pp. 179-182 ◽  
Author(s):  
Salahuddin Junus ◽  
Anne Zulfia
Keyword(s):  
Mechanical Properties ◽  
Centrifugal Casting ◽  
High Strength ◽  
Casting Process ◽  
Stir Casting ◽  
Light Weight ◽  
Seamless Pipe ◽  
Aluminum Composite ◽  
Alternative Material ◽  
New Phase

Aluminum with Al2O3 material has high strength and light weight. In this study, the aluminum is used with Al2O3 material as an alternative material seamless pipe. The making of this material seamless pipe is through the stir casting process and centrifugal casting process. The results show that the addition of reinforcing and spin method increases the mechanical properties of the cast. Influences of process-variables are analyzed using the microstructure observation. The observations show that there formed a new phase, i.e. MgO and MgAl2O4. The new phase will improve wettability and mechanical properties of the composites. The hardness value of composites growing with the increasing of the Vf% Al2O3 and the centrifugal process. The highest hardness is achieved by 47 HRB with 5%Vf Al2O3-3 wt% Mg. Expected results of aluminum composite with ceramic particles reinforcement design is to obtain a composite material, which have superior mechanical properties, such as strength, hardness, high temperature resistant and light weight. The material can be applied as an alternative material for tube and pipe products. Initially, the product materials are made of steel and now can be replaced using composite Al/Al2O3.

Improving the Mechanical Properties of AZ31 Mg Alloy by High Ratio Extrusion

2006 ◽  
Vol 503-504 ◽  
pp. 865-870 ◽  
Author(s):  
Yongjun Chen ◽  
Qu Dong Wang ◽  
Jianguo Peng ◽  
Chun Quan Zhai
Keyword(s):  
Mechanical Properties ◽  
High Strength ◽  
High Ratio ◽  
Extrusion Ratio ◽  
Mg Alloy ◽  
Fine Grained ◽  
Az31 Mg Alloy ◽  
Industry Applications ◽  
One Step ◽  
The One

Experiments were conducted both to evaluate the potential for grain refinement, the subsequent mechanical properties at room temperature in samples of AZ31 Mg alloy and also to investigate the relationship between one-step and two-step high ratio extrusion (HRE). The one-step HRE was undertaken using a high extrusion ratio of 70:1 at 250, 300 and 350°C. And the two-step HRE was conducted with an extrusion ratio of 7 for the first step at 250, 300 and 350°C, followed by a second-step extrusion with an extrusion ratio of 10 at 250, 300 and 350°C. The initial grain size in the AZ31 ingot was 100μm and that after one-step HRE became similar to 5μm, after two-step HRE at 250, 300 and 350°C were 2, 4, 7μm, respectively, resulting in superior mechanical properties at ambient temperature. The microstructure of two-step HRE was finer and uniformer than that of one-step HRE and the strength of one-step and two-step HRE were similar, moreover, the elongation of one-step HRE was improved markedly than that of two-step HRE. Dynamic recrystallization and adjacent grain broking during HRE is introduced to explain the effects of one-step and two-step HRE on the microstructure and mechanical properties of AZ31 Mg alloy. The current results imply that the simple HRE method might be a feasible processing method for industry applications, and the multiply steps extrusion are effective to fabricate high strength of fine grained hcp metals.

scholarly journals Evaluation of Mechanical Properties of AA7075 /Al2O3/Mg Hybrid Composites

2019 ◽  
Vol 8 (6) ◽  
pp. 5044-5046 ◽  
Keyword(s):  
Mechanical Properties ◽  
Hybrid Composites ◽  
Casting Process ◽  
Stir Casting ◽  
Tensile Behaviour ◽  
Matrix Composites ◽  
Compression Behavior ◽  
Weight Percentage ◽  
Fea Simulation ◽  
Alloy Metal

The present work was planned to evaluate the mechanical properties of alumina reinforced aluminium alloy such hardness and compression behavior of al2o3 /aa7075 alloy metal matrix composites. Both, experimental and finite element analyses were carried out to establish tensile behaviour of the composites with different weight percentage of al2o3 fabricated by the stir casting process. The results concluded that addition of alumina to the aa7075 improves the mechanical properties of the composite. Further the results of FEA simulation of the composites are close to the actual results which shows that cost and time can be reduced if FEA is performed

Study on Mechanical Property of Aluminium 6061 with E Glass Fiber Reinforced Composite

2018 ◽  
Vol 877 ◽  
pp. 50-53 ◽  
Author(s):  
Vinayashree ◽  
R. Shobha
Keyword(s):  
Mechanical Properties ◽  
Glass Fiber ◽  
High Strength ◽  
Matrix Alloy ◽  
Stir Casting ◽  
Reinforced Composite ◽  
Reinforcement Content ◽  
Glass Fiber Reinforced ◽  
The Matrix ◽  
Glass Fibre Reinforced

Aluminium composites are in predominant use due to their lower weight and high strength among the MMC’s. Aluminium 6061 is selected as matrix and E-glass fiber is selected as reinforcement. Fabrication of composite is done by stir casting method. Each fabrication carries the E-glass reinforcement content varied from 2% to 10%. The present article attempts to evaluate the mechanical properties of E-glass fibre reinforced composite and study the effect of reinforcement on the matrix alloy through mechanical properties. When compared to ascast mechanical properties the UTS has increased from 74.28 N/sq mm to 146.8 N/sq mm for a composite at 6% E-glass. The hardness of as-cast has also increased from 22 RHB to 43 RHB at 6% E-glass and the wear of composite has exhibited a decreasing tend with increase in reinforcement content along the sliding distance. The results are analyzed in certain depth in the current paper. The mechanical properties of composites have improved with the increase in the weigh percentage of glass fiber in the aluminium matrix.

Investigation of mechanical properties and tribological performance of Al-LSP and Al-Al2O3 composite

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Lokanadham Dharmana ◽  
Venkata Subbaiah Kambagowni
Keyword(s):  
Mechanical Properties ◽  
Optimal Condition ◽  
Casting Process ◽  
Stir Casting ◽  
Tribological Performance ◽  
Connecting Rod ◽  
Content Type ◽  
Specific Strength ◽  
Error Band ◽  
Structural Applications

Purpose This study aims to develop the Al-Si-Mg metal matrix composite, reinforced distinctly with lime stone powder (LSP; 12% by weight) and Al2O3 (12% by weight), and compare their mechanical properties and tribological performance. Design/methodology/approach The composites are fabricated through stir casting process. In view of the previous work, the Al-LSP composite with LSP reinforcement (12 Wt.%) shows enhanced mechanical properties and tribological performance, as compared with other weight percentages. Findings Though the Al-LSP composite is less expensive, it shows similar hardness, tensile strength and specific strength, when compared with Al- Al2O3 composite. However, the Al-LSP composite exhibits significant enhancement of above three properties, when compared with Al-Si-Mg metal. The systematic factorial design of experiments is obtained through Taguchi OA [L9]. The tribological performance is estimated through wear rate (WR-mm3/m) and coefficient of friction (CF) by varying the operating parameters of sliding distance (SD), load (L) and sliding velocity (SV). According to ANOVA results, the optimal condition of WR for all the tested materials is L1SD3SV1. Further, the optimal condition of CF is L1SD1SV3 for Al-LSP and Al-Si-Mg metal, while L2SD3SV2 is for Al-Al2O3 composite. The regression equation predicts the measured experimental values within error band of ± 8 percentage. Originality/value A comparison of two composite materials (Al-LSP and Al-Al2O3) with same weight fractions (12%) shows almost same trend in both the mechanical and tribological testing process. However, the developed Al-LSP composite exhibited better properties than the Al-Al2O3 and Al-base. Therefore, Al-LSP can be suggested for automotive applications (i.e., connecting rod, cylinder liners, camshaft) and structural applications (such as frames, over hanging supports), without compromising in desirable original with properties of constituents in the new material, which is achievable for looking to the end uses.

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