scholarly journals Effect of Combined Extrusion and Rolling Parameters on Mechanical and Corrosion Properties of New High Strength Al-Mg Alloy

Metals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 445
Author(s):  
Kweon-Hoon Choi ◽  
Bong-Hwan Kim ◽  
Da-Bin Lee ◽  
Seung-Yoon Yang ◽  
Nam-Seok Kim ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Current Density ◽  
Intergranular Corrosion ◽  
Artificial Aging ◽  
Corrosion Potential ◽  
Volume Fraction ◽  
High Strength ◽  
Mg Alloy ◽  
Corrosion Properties

High strength Al-Mg alloy is an attractive material that has the characteristic of increasing both strength and elongation by adding more solute Mg. However, there is a limitation in the oxidation issue during the casting process when it contains high amounts of solute Mg. New Al-Mg alloy was developed using Mg+Al2Ca master alloy by making a stable CaO/MgO mixed layer that no significant oxidation occurred. Here, the intergranular corrosion (IGC), electrochemical, and mechanical properties of new Al-Mg alloys fabricated through a combined process of extrusion and cold rolling were studied after the specimens went through artificial aging heat treatment at 200 °C. The results show that the grain size and the volume fraction of anodic β-precipitation (Mg2Al3) forming on the grain boundary influence the intergranular corrosion results. Corrosion potential and current density were achieved by potentiodynamic polarization electrochemical test. The results show that corrosion potential remains irrespective of the manufacturing process, while current density increases with artificial aging treatment. Both hardness and tensile mechanical properties decrease on cold rolled specimens after the heat treatment, while increase in extrusion and annealed specimens.

Effect of Artificial Aging on Aluminum Extrusion Alloy for Automobile Bumper

2011 ◽  
Vol 695 ◽  
pp. 190-193
Author(s):  
Sun Dae Kim ◽  
Hoon Cho ◽  
Do Hyang Kim
Keyword(s):  
Mechanical Properties ◽  
Aging Process ◽  
Artificial Aging ◽  
Precipitation Hardening ◽  
Volume Fraction ◽  
High Strength ◽  
Atomic Ratio ◽  
Aluminum Extrusion ◽  
Extrusion Alloy ◽  
Processing Factors

The heat-treatable, precipitation-hardening, aluminum alloys are of special interest for automobile where high strength and dent resistance are required, and for bumpers, where good strength and shock absorption are needed. In both cases, good formability is also an important requirement. The heat-treatable 6000-series Al-Mg-Si alloys have been the material of choice for automobile. Despite the high strengthening potential of Al-Mg-Si alloys, processing factors such as the artificial aging processes, as well as the duration of artificial aging, can seriously impede the strengthening process. The highest tensile strength of A6082 alloy was obtained when Mg/Si atomic ratio is set to 1.1 due to the biggest volume fraction of intermetallic compound containing Mg and Si. It was to determine how aging process affected the microstructure and mechanical properties of the A6082 alloy as different ratio between Mg and Si.

scholarly journals High Mechanical Properties of AZ91 Mg Alloy Processed by Equal Channel Angular Pressing and Rolling

Metals ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 386 ◽  
Author(s):  
Yuchun Yuan ◽  
Qingfang Guo ◽  
Jiapeng Sun ◽  
Huan Liu ◽  
Qiong Xu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Low Temperature ◽  
Equal Channel Angular Pressing ◽  
Solution Heat Treatment ◽  
High Strength ◽  
Mg Alloy ◽  
Angular Pressing ◽  
Wrought Magnesium Alloy ◽  
Combined Solution

Mechanical properties usually take precedence for wrought magnesium alloy when it would be used as a structure material. This paper proposed an approach that achieved high strength in AZ91 Mg alloy. The main procedure combined solution heat treatment, equal channel angular pressing (ECAP), and the subsequent low temperature rolling. After solution heat treatment and ECAP, the alloy had fine grains and excellent ductility, which benefited the following rolling at low temperature. By the following rolling (at 150 °C), the strength was further increased to ~432 MPa with a moderate ductility. This approach was proved effective in refining the grains and accumulating dislocations. The ultrahigh strength was attributed to the high density of dislocations and fine structure. The uniformly distributed fine precipitates also supplied precipitate hardening. Recrystallization that happened during rolling and annealing was the main reason for the moderate ductility.

scholarly journals Correlation between Microstructure and Mechanical Properties of Austempered Ductile Irons

2018 ◽  
Vol 925 ◽  
pp. 203-209 ◽  
Author(s):  
Vinicius Cardilo Campos Alves ◽  
Luciano Lobo de Almeida Baracho ◽  
Césio Túlio Alves dos Santos ◽  
Luiz Carlos Rolim Lopes ◽  
Éder dos Reis Silva ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Volume Fraction ◽  
High Strength ◽  
Strong Relationship ◽  
Residual Austenite ◽  
X Ray Diffraction ◽  
Wear Properties ◽  
Cast Irons ◽  
Nodular Graphite

Austempered ductile cast irons (ADI) have received great attention in last years because their combined properties of good ductility, high strength and fracture toughness, good fatigue strength, good wear properties and low production cost. Such combination of properties can be reached because of their microstructures consist of a mixture acicular ferrite (bainite), residual austenite with a high carbon content and nodular graphite. In this work, the effect of austempering heat treatment on the microstructure of a commercial alloy to produce three different grades of ADI, with different strength level, is analyzed. Microstructure characterization has been performed using techniques of optical microscopy, scanning electron microscopy and x-ray diffraction. Mechanical properties were evaluated from tensile and impact tests at room temperature. In addition, the residual stress due to heat treatment was evaluated. The results of this study show that there is a strong relationship between austempering temperatures and mechanical properties. The highest tensile and yield strength obtained were 1599 and 1427 MPa, respectively, for the sample austempered at 280°C. The sample austempered at 320°C presented the highest Charpy absorption energy (99,90 J) and highest volume fraction of austenite (27%).

Influence of Heat Treatment on Corrosive Property of 5083 Aluminum Alloy

2013 ◽  
Vol 779-780 ◽  
pp. 205-211 ◽  
Author(s):  
Chun Hong Li ◽  
Chun Mei Li ◽  
Deng Ming Chen
Keyword(s):  
Heat Treatment ◽  
Intergranular Corrosion ◽  
Corrosion Potential ◽  
Electrochemical Corrosion ◽  
Nacl Solution ◽  
Corrosion Properties ◽  
Corrosion Phenomenon ◽  
Cold Rolled ◽  
5083 Aluminum Alloy ◽  
Corrosive Property

The microstructure and intergranular corrosion phenomenon were investigated by means of optical imaging,SEM and EDS. Hardness was conducted and electrochemical corrosion properties were researched in 3.5% Nacl solution by electrochemical tester.The result showed, there was no intergranular corrosion phenomenon when the samples underwent cold rolling and stabilization heat treatment;The intergranular corrosion was obviously when the samples were annealed at 180°C for 90h or 150h;The corrosion potential of TO1 state annealed at 180°C for 90h and TO2 state annealed at 180°C for 150h was lower than cold rolled and stabilization heat treatment samples，they were more susceptible to electrochemical corrosion.

scholarly journals EFFECTS OF COOLING RATE ON THE VOLUME FRACTION OF RETAINED AUSTENITE IN FORGINGS FROM HIGH-STRENGTH Mn-Si STEELS

2019 ◽  
Vol 25 (2) ◽  
pp. 93 ◽  
Author(s):  
Dagmar Bublíková ◽  
Hana Jirková ◽  
Kateřina Rubešová ◽  
Michal Peković ◽  
Julie Volkmannová ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Cooling Rate ◽  
Retained Austenite ◽  
Physical Simulation ◽  
Volume Fraction ◽  
High Strength ◽  
Hot Water ◽  
Quenching Temperature ◽  
Soaking Temperature

<p class="AMSmaintext"><span lang="EN-GB">Various ways are sought today to increase mechanical properties of steels while maintaining their good strength and ductility. Besides effective alloying strategies, one method involves preserving a certain amount of retained austenite in a martensitic matrix. The steel which was chosen as an experimental material for this investigation contained 2.5% manganese, 2.09% silicon and 1.34% chromium, with additions of nickel and molybdenum. An actual closed-die forged part was made of this steel. This forged part was fitted with thermocouples attached to its surface and placed in its interior and then treated using the Q&amp;P process. Q&amp;P process is characterized by rapid cooling from a soaking temperature to a quenching temperature, which is between the Ms and the Mf, and subsequent reheating to and holding at a partitioning temperature where retained austenite becomes stable. The quenchant was hot water. Cooling took place in a furnace. Heat treatment profiles were constructed from the thermocouple data and the process was then replicated in a thermomechanical simulator. The specimens obtained in this manner were examined using metallographic techniques. The effects of cooling rate on mechanical properties and the amount of retained austenite were assessed. The resultant ultimate strength was around 2100 MPa. Elongation and the amount of retained austenite were 15% and 17%, respectively. Microstructures and mechanical properties of the specimens were then compared to the real-world forged part in order to establish whether physical simulation could be employed for laboratory-based optimization of heat treatment of forgings.</span></p>

Effect of Retrogression Medium to the Mechanical Properties of Aluminum Alloy 7075

2012 ◽  
Vol 165 ◽  
pp. 6-11 ◽  
Author(s):  
Ng Guan Yao ◽  
Bin Abd Rashid Mohd Warikh ◽  
Buang Zolkepli ◽  
N. Nadiah ◽  
S.C. Leng
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Aluminum Alloy ◽  
Volume Fraction ◽  
Mechanical Test ◽  
High Strength ◽  
Hardness Test ◽  
General Corrosion ◽  
Corrosion Properties ◽  
Aluminum Alloy 7075

Aluminum alloy 7075 is a useful material in industry due to its light weight, high strength, and resistance to general corrosion properties. The drawback of this alloy is its susceptibility to stress corrosion cracking (SCC). From the previous research, it was found that retrogression and re-aging (RRA) heat treatment is able to improve the SCC resistance of this alloy. In this study, the mechanical properties and microstructure alteration due to RRA was studied. First, the tensile specimens are heat treated to T6 and then retrogressed at 165/185/205°C for 10/30 minutes followed by re-aging at 120°C for 24 hours. The retrogression methods are categorized as standard retrogression and oil retrogression. Next, the specimens were gone through tensile test, hardness test, and microstructure characterization by using SEM. From the mechanical test result, the tensile strength and hardness of the alloy decreased upon the increment of retrogression temperature and time. The highest tensile strength of 638.48 MPa was observed at oil retrogress sample at 165°C for 10 minutes which is slight higher than T6 sample. Besides, different phases of precipitation were reviewed by the Kellers etching process. Also, the volume fraction of η phase is increased upon increasing the retrogression temperature and time.

Effect of Cold Working and Heat Treatment on Recrystallization, Mechanical Properties and Microstructure of High Strength Ti15V3Al3Cr3Sn (Ti-Beta) Alloy

2012 ◽  
Vol 710 ◽  
pp. 521-526 ◽  
Author(s):  
Pravin Muneshwar ◽  
Satish Kumar Singh ◽  
K. Naresh Kumar ◽  
Bhanu Pant ◽  
K. Sreekumar
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Cold Working ◽  
Volume Fraction ◽  
High Strength ◽  
Hardness Measurement ◽  
Beta Phase ◽  
Recrystallization Temperature ◽  
Beta Alloy ◽  
Cold Worked

Ti15V3Al3Cr3Sn (Ti-15-3-3-3) alloy is a highly cold formable metastable beta alloy and attains very high strength by proper selection of cold working and heat treatment cycles. Due to the presence of softer BCC beta phase at ambient temperature in solution treated condition, this alloy is highly cold workable; to as much as 90% without need of any intermediate annealing. In the present work, cold working up to 83% was imparted to the sheet. Subsequently, cold worked sheet was solution annealed at various temperatures. Cold worked and solution annealed samples were provided with two types of aging cycles: 482°C/16hrs/AC (STA-1) and 538°C/8hrs/AC (STA-2). Hardness measurement, tensile property and microstructural evaluation in cold worked (CW), CW plus solution annealed (CWSA) and CWSA plus aged conditions were carriedout. Recrystallization temperature has been observed to be dependent on extent of cold working. Tensile properties are higher for STA-1 cycle as compared to STA-2 cycle. Hardness values in cold worked condition are higher than solution annealed samples whereas for cold worked and STA samples, an increase in hardness w.r.t. to annealed values has been observed. Corresponding volume fraction of alpha precipitates is found to be more with STA-1 cycle than STA-2 cycle. Also, distribution of the precipitates with STA-1 cycle is observed to be more uniform than STA-2 cycle. The present paper discusses the effect of cold working on recrystallization, mechanical properties and microstructure in Ti-15-3-3-3 beta alloy.

UNS A97075

Alloy Digest ◽  
1986 ◽  
Vol 35 (7) ◽  
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Aluminum Alloy ◽  
High Strength ◽  
Heat Treating ◽  
Good Resistance ◽  
Temperature Performance ◽  
Structural Applications ◽  
Structural Parts ◽  
Very High

Abstract UNS No. A97075 is a wrought precipitation-hardenable aluminum alloy. It has excellent mechanical properties, workability and response to heat treatment and refrigeration. Its typical uses comprise aircraft structural parts and other highly stressed structural applications where very high strength and good resistance to corrosion are required. This datasheet provides information on composition, physical properties, hardness, elasticity, tensile properties, and shear strength as well as fatigue. It also includes information on low temperature performance as well as forming, heat treating, and machining. Filing Code: Al-269. Producer or source: Various aluminum companies.

Effect of post-heat treatment on microstructure and mechanical properties of laser welded Al-Cu-Mg alloy

2021 ◽  
Vol 64 ◽  
pp. 620-632
Author(s):  
Alexander Malikov ◽  
Anatoly Orishich ◽  
Igor Vitoshkin ◽  
Evgeniy Karpov ◽  
Alexei Ancharov
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Mg Alloy ◽  
Post Heat Treatment ◽  
Microstructure And Mechanical Properties
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