scholarly journals The Evolution of Microstructure, Mechanical Properties and Fracture Behavior with Increasing Lanthanum Content in AZ91 Alloy

Metals ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1256
Author(s):  
Di Tie ◽  
Yi Jiang ◽  
Renguo Guan ◽  
Minfang Chen ◽  
Jufu Jiang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Fracture Behavior ◽  
Aging Treatment ◽  
Industrial Applications ◽  
Az91 Alloy ◽  
Refined Microstructure ◽  
Lanthanum Content ◽  
Cast Alloys ◽  
Evolution Of Microstructure ◽  
Strength And Ductility

AZ91 alloy is a widely applied commercial magnesium alloy due to its good castability, balanced mechanical properties and acceptable price, and lanthanum alloying has been proven to be one of the most effective methods to further improve its mechanical properties. Therefore, we reveal the evolution of microstructure, mechanical properties and fracture behavior with increasing lanthanum content in AZ91 alloy in this study. The magnesium matrix was significantly refined by lanthanum content, and this effect became more evident with increasing addition of lanthanum. The presence of Al3La precipitates significantly reduced the grain mobility and suppressed the formation of Mg17Al12 discontinuous precipitates along the grain boundaries. The rheo-cast alloys exhibited improved and balanced tensile strength and ductility after aging treatment. The fracture type of AZ91-La alloys could be classified as ductile fracture due to the presence of less quasi-cleavage planes and more dimples with a mixture of tear ridges and micropores. Due to the fully refined microstructure and the balanced mechanical properties, the AZ91–1.0La (mass%) alloy presented the greatest potential for industrial applications among the three studied AZ91-La alloys.

Effect of Magnesium and Artificial Aging on the Microstructure and Mechanical Properties of Al-Si-Mn-Mg Alloys

2009 ◽  
Vol 83-86 ◽  
pp. 415-420
Author(s):  
S.G. Shabestari ◽  
M.M. Hejazi ◽  
M. Bahramifar
Keyword(s):  
Mechanical Properties ◽  
Quality Index ◽  
Industrial Applications ◽  
Maximum Value ◽  
Microstructure And Mechanical Properties ◽  
Heat Treated ◽  
Cast Alloys ◽  
Mg Addition ◽  
Strength And Ductility ◽  
Magnesium Addition

The effect of magnesium addition up to 0.9 wt.% on the microstructure and mechanical properties of Al-9Si-0.35Mn alloy has been investigated in both as-cast and heat treated conditions. Generally, Mg addition increases the heat treatability and strength of the alloys at the expense of the lower ductility. High levels of magnesium addition, causes the formation of large and brittle intermetallics, a slight increase in porosity and hence, a decrease in ultimate tensile strength and ductility of the cast alloys. T6 heat treatment increases the strength of the alloys up to 80 percent compared to as-cast samples. Among the studied compositions, heat treated Al-9Si-0.35Mn-0.25Mg alloy, has the maximum value of quality index and can be regarded as a promising material with the optimum mechanical properties for industrial applications.

Effect of aging treatment on mechanical properties and fracture behavior of friction stir processed Mg–Y–Nd alloy

2016 ◽  
Vol 51 (16) ◽  
pp. 7571-7584 ◽  
Author(s):  
Genghua Cao ◽  
Datong Zhang ◽  
Xicai Luo ◽  
Weiwen Zhang ◽  
Wen Zhang
Keyword(s):  
Mechanical Properties ◽  
Fracture Behavior ◽  
Aging Treatment ◽  
Friction Stir

Effect of Artificial Aging on Microstructures and Mechanical Properties of Extruded Mg Alloy ZK60

2014 ◽  
Vol 697 ◽  
pp. 72-75
Author(s):  
De Liang Yin ◽  
Jian Qiao ◽  
Hong Liang Cui
Keyword(s):  
Mechanical Properties ◽  
Yield Strength ◽  
Aging Time ◽  
Artificial Aging ◽  
Aging Treatment ◽  
Tensile Tests ◽  
Tensile Yield Strength ◽  
Uniaxial Tensile ◽  
Fracture Elongation ◽  
Strength And Ductility

An extruded ZK60 magnesium alloy was subjected to artificial aging at 180 oC for an investigation of the effect of aging time on its precipitation behavior and mechanical properties. Uniaxial tensile tests were conducted to obtain the mechanical properties. Optical microscopy and transmission electron microscopy (TEM) were employed to observe microstructure change before and after aging treatment. It is shown that, both tensile yield strength and ultimate tensile strength increases with aging time. The fracture elongation after aging for 20 h reaches up to 21.0%, and the yield strength increases to 269.5 MPa, 19.4% higher than that of extruded specimens (un-aged), showing a good match of strength and ductility. Three newly-formed precipitates were observed after aging for over 20 h, among which particulate and dispersive precipitates should be responsible for the good combination of strength and ductility.

DC Casting, Deformation and Strengthening of Al-Si Alloys

2012 ◽  
Vol 706-709 ◽  
pp. 186-193 ◽  
Author(s):  
Liang Zuo ◽  
Fu Xiao Yu
Keyword(s):  
Mechanical Properties ◽  
Direct Chill ◽  
Cast State ◽  
The Poor ◽  
Low Thermal Expansion ◽  
Cast Alloys ◽  
Superior Mechanical Properties ◽  
Deformation And Heat Treatment ◽  
Dc Casting ◽  
Strength And Ductility

Al-Si alloys are widely used as cast alloys for their excellent castability, low thermal expansion coefficient, good wear resistance and corrosion resistance properties. However, the poor ductility of these alloys, caused by the presence of coarse and non-deformable Si phase in the as-cast state, has inhibited their applications as wrought materials. Recently, a process based on traditional technologies, i.e., direct chill (DC) casting followed by hot deformation and heat treatment, has been developed for potential mass production of wrought Al-Si alloys with superior mechanical properties in view of their strength and ductility. In this work, the microstructural evolutions of DC cast Al-Si alloys involved in solidification, recrystallization and precipitation during the processing are highlighted, aiming at understanding the correlations between the microstructures and the mechanical properties.

Effects of Aged Conditions on the Fracture Surface Fractal Dimension and Mechanical Behavior of an Austenitic Stainless Steel

2000 ◽  
Vol 6 (S2) ◽  
pp. 768-769
Author(s):  
O. A. Hilders ◽  
A. Quintero ◽  
L. Berrio ◽  
R. Caballero ◽  
L. Sáenz ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Fractal Dimension ◽  
Fractal Geometry ◽  
Fracture Behavior ◽  
Main Part ◽  
Room Temperature ◽  
Fracture Topography ◽  
Type Stainless Steel ◽  
Strength And Ductility

There have been several attempts to find a relation between the fractal morphology of the fracture surfaces and the mechanical properties of engineering materials., although the current resuls are inconclusive. If there are correlations between the fractal dimension and such properties, this parameter could be very useful to predict them and to improve the resistance to fracture. The main part of the investigations concerned with the fractal geometry and fracture behavior concentrate on the relations between roughness and fracture toughness . In the present work, the effects of thermal aging at 850°C on the fracture topography developed during the rupture in tension at room temperature of a 304 type stainless steel and their relation with the strength and ductility, were studied using the fractal geometry approach.

Effects of aging treatment on the precipitation behaviors and mechanical properties of Al-5.0Mg-3.0Zn-1.0Cu cast alloys

2020 ◽  
Vol 842 ◽  
pp. 155707
Author(s):  
Hua-Ping Tang ◽  
Qu-Dong Wang ◽  
Colin Luo ◽  
Chuan Lei ◽  
Tian-Wen Liu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Aging Treatment ◽  
Cast Alloys ◽  
Effects Of Aging

scholarly journals Pengaruh Secondary Aging Treatment Terhadap Sifat Mekanik Dan Surface Glossiness Pada Aluminium Paduan 7003

2019 ◽  
Vol 9 (01) ◽  
pp. 55-59
Author(s):  
Ramli Ramli
Keyword(s):  
Mechanical Properties ◽  
Aluminium Alloy ◽  
High Surface ◽  
Aging Treatment ◽  
High Strength ◽  
Industrial Applications ◽  
Confocal Laser ◽  
Test Machine ◽  
Oxidation Layer ◽  
Hardness Tester

As technology advances and the quality of life improves, there is a deep need that requires of aluminium alloy that bears high strength, high toughness, high surface glossiness, anti-corrosion, and high fatigue resistivity [2]. This study aims to investigate the effects of secondary aging treatment on the mechanical properties and Surface Glossiness of the 7003 aluminium alloy by using several equipment, including: confocal laser microscope, white light interferometer, gloss meter, micro Vickers hardness tester and tensile test machine. This research was conducted by experimental method by giving treatment on the aluminium alloy 7003 with some treatments, there are: aging treatment at 100˚C for 5 hours and then secondary aging treatment at several different temperatures at 150˚C, 175˚C and 200˚C for 9 hours respectively. Based on our experimental results, it obtained: After being aged at 100 ℃ for 5 hours and then secondary aged at 175℃ for 9 hours, the 7003 aluminium alloy obtained excellent mechanical properties, which can achieve the industrial requirements of Yield strength 320 MPa and Elongation 13% for 3C mobile phone products. The 7003 aluminium alloy after being anodizing treated could obtain excellent Surface Glossiness and oxidation layer. The present aluminium alloy can achieve Surface Glossiness better than 1200 GU and the thickness of oxidation layer exceed 10μm, which were suitable for 3C industrial applications.

Effects of Hot Extrusion and Heat Treatment on Mechanical Properties and Microstructures of AZ91 Magnesium Alloy

2012 ◽  
Vol 562-564 ◽  
pp. 242-245 ◽  
Author(s):  
Ming Tan ◽  
Zhao Ming Liu ◽  
Gao Feng Quan
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Tensile Strength ◽  
Magnesium Alloy ◽  
Solution Treatment ◽  
Annealing Treatment ◽  
Aging Treatment ◽  
Az91 Alloy ◽  
Az91 Magnesium Alloy ◽  
Az91 Magnesium

The effects of heat treatment on the microstructure, tensile property and fracture behavior of as-extruded AZ91 magnesium alloy were studied by OM and SEM. The results show that the grain of as-cast AZ91 alloy is refined by extruding and dynamic recrystallization, and the mechanical properties increase obviously. The ductility is significantly enhanced after solution treatment of the as-extruded AZ91 alloy, tensile strength is almost the same before and hardness is significantly reduced after solution treatment and artificial aging treatment. The tensile strength reduced and the ductility is significantly enhanced of as-extruded AZ91 magnesium alloy after annealing processes. The fracture surface of as-extruded AZ91 magnesium alloy has the mixture of ductile and brittle characteristic. But after T6 or annealing treatment, its dimple number increases evidently.

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