Effect of Al-5Ti-1B Grain Refiner on Microstructure and Mechanical Properties of 7075 Aluminum Alloy

2015 ◽  
Vol 817 ◽  
pp. 331-336
Author(s):  
Tao Li ◽  
Shun Cheng Wang ◽  
Kai Hong Zheng
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Aluminum Alloy ◽  
Average Diameter ◽  
7075 Aluminum Alloy ◽  
Grain Refiner ◽  
Coarse Dendrite ◽  
Microstructure And Mechanical Properties ◽  
Equiaxed Grains ◽  
Addition Amount

The microstructure of Al-5Ti-1B grain refiner was analyzed by XRD and SEM. The effect of the Al-5Ti-1B grain refiner on the microstructure and mechanical properties of 7075 aluminum alloy were studied. Results show that when the addition amount of Al-5Ti-1B grain refiner is 0.1%, the microstructure of 7075 aluminum alloy is refined from coarse dendrite to equiaxed grains with an average diameter of 55.1μm. The tensile strength and elongation of 7075 aluminum alloy are improved by 11.32% and 36.04% compared with that of 7075 aluminum alloy without adding Al-5Ti-1B grain refiner. With increasing the addition amount of Al-5Ti-1B grain refiner from 0.1% to 0.5%, both the tensile strength and elongation are improved. When the addition amount of Al-5Ti-1B grain refiner increases to 0.5%, the microstructure of 7075 aluminum alloy is refined to uniform equiaxed grains with an average diameter of 32.5μm. The tensile strength and elongation are improved by 18.11% and 48.76%, respectively.

Effect of Al-5Zr-1.1B Grain Refiner on Microstructure and Mechanical Properties of AZ91D Magnesium Alloy

2015 ◽  
Vol 816 ◽  
pp. 337-342
Author(s):  
Shun Cheng Wang ◽  
Zheng Hua Huang ◽  
Wen Jun Qi ◽  
Kai Hong Zheng
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Magnesium Alloy ◽  
Average Diameter ◽  
Grain Refiner ◽  
Mixed Powder ◽  
Az91d Magnesium Alloy ◽  
Microstructure And Mechanical Properties ◽  
Equiaxed Grains ◽  
Addition Amount

An Al-5Zr-1.1B grain refiner was prepared by in-situ synthesis from Al melt and K2ZrF4+KBF4 mixed powder. The microstructure of Al-5Zr-1.1B grain refiner was analyzed by XRD, SEM and EDS. The effect of Al-5Zr-1.1B grain refiner on the microstructure and mechanical properties of AZ91D magnesium alloy were studied. Results show that a large number of fine ZrB2 particles were observed in the Al-5Zr-1.1B grain refiner and the ZrB2 particles could act as the heterogeneous nuclei of α-Mg grains. With the increase of the addition amount of Al-5Zr-1.1B grain refiner, the α-Mg grains of AZ91D magnesium alloy were refined from coarse dendrites to equiaxed grains. When the addition amount of Al-5Zr-1.1B grain refiner increased to 0.6%, the α-Mg grains of AZ91D magnesium alloy were refined to fine equiaxed grains with an average diameter of 45 μm, and the tensile strength and elongation of AZ91D magnesium alloy were improved to 195.3 MPa and 3.94%, respectively. The α-Mg grains average diameter of AZ91D magnesium alloy decreased by 73.5% and the tensile strength and elongation improved by 25.9% and 27.9% compared with that of AZ91D magnesium alloy without adding the Al-5Zr-1.1B grain refiner. It is concluded that the Al-5Zr-1.1B is an effective grain refiner to refine the α-Mg grains of AZ91D magnesium alloy.

An Investigation into Microstructures and Properties of 7075-T6 during Friction Stir Welding

2013 ◽  
Vol 772 ◽  
pp. 94-97 ◽  
Author(s):  
Wei Wu ◽  
Da Jun Chen
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Aluminum Alloy ◽  
Weld Zone ◽  
Base Metals ◽  
Rotating Speed ◽  
Friction Stir ◽  
Strain Fracture ◽  
Ductile Mode ◽  
Equiaxed Grains

Microstructural and mechanical properties of friction stir welded 4mm7075-T6 aluminum alloy were investigated in this paper. The microstructures in WAZ,TMAZ and HAZ were analyzed. The results show that with the rotating speed at 1500 rpm and welding speed at 60mm/min, a defect-free welding joint was obtained. The tensile strength was 362 MPa, which is 65% of base metals; Weld nugget is composed of equiaxed grains; The lowest hardness between the TMAZ and HAZ of advancing side. The fractography revealed that samples failed in ductile mode and the strain fracture appears in advancing side of weld zone.

Microstructure and Mechanical Properties of Eco-2024-T3 Aluminum Alloy

2012 ◽  
Vol 602-604 ◽  
pp. 623-626 ◽  
Author(s):  
Seon Ho Kim ◽  
Kyu Sik Kim ◽  
Shae K. Kim ◽  
Young Ok Yoon ◽  
Kyu Sang Cho ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Aluminum Alloy ◽  
Yield Strength ◽  
Fatigue Limit ◽  
Tensile Tests ◽  
Fatigue Tests ◽  
Economic Advantage ◽  
Microstructure And Mechanical Properties ◽  
Excellent Property

In this study, the microstructures and mechanical properties of the recently developed Eco-2024-T3 alloy were examined. Eco-2024 is made using Eco-Mg (Mg-Al2Ca) in place of element Mg during the manufacture of alloy 2024-T3. This is an alloy that has economic advantage and excellent properties. Alloy Eco-2024 showed smaller crystal grains that were distributed more evenly compared to the existing alloy 2024-T3. It consisted of Al matrices containing minute amounts of Al2CuMg, Al2Cu, and Ca phases and showed microstructures with reduced amounts of Fe phases or oxide. As a result of tensile tests, this alloy exhibited yield strength of 413 MPa, tensile strength of 527 MPa, and elongation of 15.4%. In other words, it showed higher strength than the existing alloy 2024 but was similar to the existing alloy 2024 in terms of elongation. In fatigue tests, alloy Eco-2024-T3 recorded fatigue limit of 330 MPa or around 80% of its yield strength; this is a much more excellent property compared to the existing alloy 2024-T3, which has fatigue limit of 250 MPa. Based on the aforementioned results, the correlation between the excellent mechanical properties of alloy Eco-2024-T3 and its microstructure was examined.

Microstructure and Mechanical Properties of a 6061 Aluminum Alloy Part Prepared by Casting-Forging Integrated Forming Technology

2014 ◽  
Vol 788 ◽  
pp. 215-222
Author(s):  
Yong Peng ◽  
Shun Cheng Wang ◽  
Hai Tao Zhou ◽  
Kai Hong Zheng ◽  
He Xing Chen
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Aluminum Alloy ◽  
Ultimate Tensile Strength ◽  
Casting Condition ◽  
6061 Aluminum Alloy ◽  
Forming Technology ◽  
Microstructure And Mechanical Properties ◽  
Heat Treated ◽  
Alloy Part

The effect of applied forging pressure on microstructure and mechanical properties of 6061 aluminum alloy was examined. The results showed that the ultimate tensile strength, elongation and hardness of the alloy after heat-treated treatment increase with the applied forging pressure, and the corresponding highest values, 365MPa, 11.52% and 146.53HV, were obtained at the applied forging pressure of 120MPa. Compared to casting condition without forging pressure, the ultimate tensile strength, elongation and hardness can be increased by 22.8%, 98.2% and 48.7%, respectively. The defects such as the shrinkage pores and cracks were absent in the microstructure due to the applied forging pressure. The SEM observation indicated that the fracture mode of 6061 aluminum alloy is more ductile at higher applied forging pressure.

Influence on the Microstructures and Properties of A356 with Vibration Pressure in Lost Form Casting

2014 ◽  
Vol 685 ◽  
pp. 7-10 ◽  
Author(s):  
Zhong Zhao ◽  
Zi Tian Fan
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Aluminum Alloy ◽  
A356 Alloy ◽  
Solidification Process ◽  
A356 Aluminum Alloy ◽  
A356 Aluminum ◽  
Equiaxed Grains

In order to improve the mechanical properties of A356 aluminum alloy in lost form casting (LFC), vibration and pressure were applied to solidification process of LFC, and the microstructures and the mechanical properties of the castings were compared with that of the castings in LFC without vibration and pressure. The results indicated that the grains of A356 alloy with vibration pressure in LFC became finer, and the dendrites decreased, and the equiaxed grains increased. At the same time, the porosities of the castings were significantly reduced. Compared with conventional LFC, the tensile strength, elongation, and hardness of A356 alloy with vibration pressure in LFC were all increased by 10% or above.

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