The Effect of Microstructure and Mechanical Properties of Aluminium Aa6061 before and after Heat Treatment Using TIG

2013 ◽  
Vol 465-466 ◽  
pp. 881-885
Author(s):  
Rosli Ahmad ◽  
Samir Sani Abdulmalik
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Solution Heat Treatment ◽  
Artificial Aging ◽  
Vickers Microhardness ◽  
Testing Machine ◽  
Post Weld Heat Treatment ◽  
Microstructure Characteristics ◽  
Microhardness Testing ◽  
Before And After

This work studies the effect of a post-weld heat treatment (PWHT) on the mechanical and microstructure properties of an AA6061 sample welded using Tungsten Inert Gas (TIG) method. TIG method is comparatively flexible and has good economy. The welded samples were divided into as-welded and PWHTs samples. The PWHTs samples were solution heat treatment, water quenching and artificial aging. Both welded samples were cut according to the ASTM E8M-04 standard to obtain the tensile strength and the elongation of the joints. The failure pattern of the tensile tested specimens was analysed using scanning electron microscopy (SEM). A Vickers microhardness testing machine was used to measure the hardness across the joints. From the results, the PWHTs were able to enhance the mechanical properties and microstructure characteristics of the AA6061 joints welded by the TIG method.

Microstructural and Vickers Microhardness Evolution of Heat Treated Secondary Aluminium Cast Alloy

2013 ◽  
Vol 586 ◽  
pp. 137-140 ◽  
Author(s):  
Lenka Hurtalová ◽  
Eva Tillová ◽  
Mária Chalupová
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Artificial Aging ◽  
Vickers Microhardness ◽  
Cast Alloy ◽  
Solution Treatment ◽  
Holding Time ◽  
Age Hardening ◽  
Structural Components ◽  
Heat Treated

Secondary aluminium alloys are made out of aluminium scrap and aluminium-processable waste by recycling. These alloys contain different alloying elements such as Al, Cu, Fe, Si and Mg that form intermetallic phases in aluminium matrix and influence on the microstructure, basic mechanical properties and microhardness evolution in aluminium cast alloy. As experimental material was used secondary aluminium cast alloy AlSi9Cu3. Material was subjected to heat treatment (age-hardening) consisting of a solution treatment at temperature 515 °C with holding time 4 hours, than water quenching at 40 °C and artificial aging by different temperature 130 °C, 150 °C and 170 °C with different holding time (2, 4, 8, 16 and 32 hours). The age-hardening led to changes in the morphology of structural components, but also leads to precipitation of finer hardening phases in the material substructure. As optimal age-hardening mode for secondary aluminium cast alloy AlSi9Cu3 was determined mode consisting of solution treatment at temperature 515 °C with holding time 4 hours and artificial aging at temperature 170 °C with holding time 16 hours. After this heat treatment cast alloy shows the best changes in microstructure and mechanical properties. These changes are comparable with changes by primary AlSi9Cu3 cast alloy.

Combined Effect of Deformation and Precipitation on Tensile Properties of an Al-Mg-Si Alloy

2012 ◽  
Vol 706-709 ◽  
pp. 351-356 ◽  
Author(s):  
Michal Kolar ◽  
Katharina Teichmann ◽  
Sverre Gulbrandsen-Dahl ◽  
Ketill Olav Pedersen ◽  
Knut Marthinsen
Keyword(s):  
Mechanical Properties ◽  
Tensile Properties ◽  
Tensile Testing ◽  
Solution Heat Treatment ◽  
Artificial Aging ◽  
Processing Conditions ◽  
Subsequent Aging ◽  
Industrial Practice ◽  
Microstructure Characteristics ◽  
Sequential Mode

In the present work we report on the effect of pre-deformation followed by/together with artificial aging on the mechanical properties as strength, ductility and work hardening of an Al-Mg-Si alloy (AA6060). The AA6060 alloy was initially cast, homogenized and extruded according to standard industrial practice. The extruded material was then subjected to a solution heat treatment and subsequently artificially aged after (sequential mode) and during (simultaneous mode) various combinations of deformation (0-10%) and heat treatments. The aging behaviour and mechanical properties have been characterized in terms of Vickers hardness and tensile testing. It is found that small, even very small, pre-deformations strongly affect the aging behaviour and associated tensile properties. Moreover, it is found, that with the carefully chosen parameters of simultaneous deformation and aging one can reach mechanical properties superior to those following pre-deformation and subsequent aging (sequential mode). The results are compared and discussed in view of differences in processing conditions and microstructure characteristics.

scholarly journals Aging Time Effects on the Mechanical Properties of Al 6061-T6 Alloy

2018 ◽  
Vol 8 (4) ◽  
pp. 3113-3115
Author(s):  
S. M. Rajaa ◽  
H. A. Abdulhadi ◽  
K. S. Jabur ◽  
G. R. Mohammed
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Tensile Strength ◽  
Solution Heat Treatment ◽  
Artificial Aging ◽  
X Ray Diffraction ◽  
Time Effects ◽  
X Ray ◽  
Al 6061 ◽  
Characterization Studies

This work investigates the influence of artificial aging and solution heat treatment on the hardness and tensile strength (mechanical properties) of Al 6061-T6 alloy. For this investigation, several aluminum 6061-T6 alloy specimens were prepared following the ASTM 176000 recommendations. The prepared specimens were heated for 1 hour at 500ºC before being water-quenched. The procedure for artificial aging was performed for 1, 2, 3, and 4 hours at 190ºC before being slowly cooled in air. Several mechanical and characterization studies were performed on the treated specimens, including an investigation on their microstructure, tensile strength, hardness, and X-ray diffraction pattern. From the results, the strength and hardness properties of the specimens were found to be generally improved, even as the best features were obtained after 2 hours of artificial aging.

Microstructure and Mechanical Properties of ZK60 Alloy Sheets during Aging

2007 ◽  
Vol 558-559 ◽  
pp. 159-164 ◽  
Author(s):  
Jae Hyung Cho ◽  
Y.M Jin ◽  
Hyoung Wook Kim ◽  
Suk Bong Kang
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Aging Time ◽  
Solution Heat Treatment ◽  
Aging Process ◽  
Artificial Aging ◽  
Warm Rolling ◽  
Microstructure And Mechanical Properties ◽  
Zk60 Alloy

Variations in microstructure and mechanical properties of ZK60 alloy sheets were investigated with aging time. ZK60 alloy sheets with a thickness of 1mm were prepared from a casting ingot followed by homogenization and warm-rolling. Artificial aging process after solution heat treatment (T6) affected both hardness variations and precipitates distributions with aging time. Hardness variations were related to precipitates, i.e. rod-shaped ( 1 β ′ ) or disc shaped ( 2 β ′ ) particles. Rod-shaped ( 1 β ′ ) precipitates mainly consist of Mg and Zn without Zr.

Investigating the effects of traveling speeds and post-weld heat treatment on mechanical properties of nano-Al2O3-fortified AA6061-T6 friction stir welds

2016 ◽  
Vol 232 (10) ◽  
pp. 816-828 ◽  
Author(s):  
H Yousefpour Naghibi ◽  
H Omidvar ◽  
M Farahmand Nikoo
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Solution Heat Treatment ◽  
Microstructural Characterization ◽  
Post Weld Heat Treatment ◽  
Nano Particles ◽  
Friction Stir ◽  
Microscopy Techniques ◽  
Weld Heat

In this study, 6 mm thick AA6061-T6 plates were friction stir welded (FSWed) at different traveling speeds while Al2O3 nano-particles were incorporated between adjoining plates. The solution heat treatment was applied on samples for one hour at 540 ℃ and subsequently aged for 18 h at 180 ℃ to investigate the effect of post-weld heat treatment on mechanical properties of specimens. All joints were investigated macro- and micro-structurally. The microstructural characterization of the FSWed samples was carried out using scanning electron microscopy (SEM) and light microscopy techniques. Distribution of Al2O3 nano-particles in the stir zone was studied by SEM. The specimen FSWed at 40 mm/min exhibited the most homogeneous particles distribution. Tensile properties including ultimate tensile strength, elongation, and fracture surfaces were studied. Microhardness of specimens was also investigated. Surprisingly, all specimens exhibited inferior hardness compared to the as-received AA6061-T6 alloy. This phenomenon was attributed to the dissolution of precipitates during FSW process.

scholarly journals EFFECTS OF THE HEAT TREATMENT ON THE MECHANICAL PROPERTIES OF 6201 ALUMINIUM ALLOY WIRE

2019 ◽  
Vol 57 (3A) ◽  
pp. 11 ◽  
Author(s):  
Khanh Cong Huynh
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Aluminium Alloy ◽  
Tensile Testing ◽  
Solution Heat Treatment ◽  
Testing Machine ◽  
Machine Model ◽  
Tensile Testing Machine ◽  
Alloy Wire ◽  
Heat Treated

Type 6201 aluminium alloy wires are produced by drawing 4.7 mm diameter billet-on-billet extruded redraw rod down to 2.7 mm diameter wires. Before drawing, the first group of redraw rod coils was annealed at 480oC for 4 hours to reduce the hardness of the redraw rod. The second group of redraw rod coils was drawn without annealing. With each group of redraw rod, after drawing, some wire coils were solution heat treated, then artificially aged or naturally aged. The other wire coils were artificially aged or naturally aged without solution heat treatment. Mechanical properties of the wires were assessed by a tensile testing machine (model UTM-1000)With suitable aging temperature and aging time, wires produced from each group of redraw rod coils with or without solution heat treatment attain tensile requirements of ASTM B398, but wires produced with solution heat treatment attain higher elongation than wires produced without solution heat treatment.

Influences of post weld heat treatment on tensile strength and microstructure characteristics of friction stir welded butt joints of AA2014-T6 aluminum alloy

2016 ◽  
Vol 25 (3-4) ◽  
pp. 89-98 ◽  
Author(s):  
C. Rajendran ◽  
K. Srinivasan ◽  
V. Balasubramanian ◽  
H. Balaji ◽  
P. Selvaraj
Keyword(s):  
Heat Treatment ◽  
Aluminum Alloy ◽  
Artificial Aging ◽  
Solution Treatment ◽  
Aging Treatment ◽  
Post Weld Heat Treatment ◽  
Butt Joints ◽  
Friction Stir ◽  
Microstructure Characteristics ◽  
Weld Heat

AbstractFriction stir welded (FSWed) joints of aluminum alloys exhibited a hardness drop in both the advancing side (AS) and retreating side (RS) of the thermo-mechanically affected zone (TMAZ) due to the thermal cycle involved in the FSW process. In this investigation, an attempt has been made to overcome this problem by post weld heat treatment (PWHT) methods. FSW butt (FSWB) joints of Al-Cu (AA2014-T6) alloy were PWHT by two methods such as simple artificial aging (AA) and solution treatment followed by artificial aging (STA). Of these two treatments, STA was found to be more beneficial than the simple aging treatment to improve the tensile properties of the FSW joints of AA2014 aluminum alloy.

scholarly journals Usable Properties of AlSi7Mg Alloy after Sodium or Strontium Modification

2016 ◽  
Vol 16 (3) ◽  
pp. 129-132 ◽  
Author(s):  
M. Tupaj ◽  
A.W. Orłowicz ◽  
M. Mróz ◽  
A. Trytek ◽  
O. Markowska
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Fatigue Strength ◽  
Solution Heat Treatment ◽  
Artificial Aging ◽  
Cast Alloy ◽  
Grain Refining ◽  
Strength Parameters ◽  
Microstructure Parameters ◽  
Porosity Ratio

Abstract The paper deals with the effect of microstructure diversified by means of variable cooling rate on service properties of AlSi7Mg cast alloy refined traditionally with Dursalit EG 281, grain refining with titanium-boron and modified with sodium and a variant of the same alloy barbotage-refined with argon and simultaneously grain refining with titanium-boron and modified with strontium. For both alloy variants, the castings were subject to T6 thermal treatment (solution heat treatment and artificial aging). It turned out that AlSi7Mg alloy after simultaneous barbotage refining with argon and grain refining with titanium-boron and modified with strontium was characterised with lower values of representative microstructure parameters (SDAS – secondary dendrite arm spacing, λE, lmax) and lower value of the porosity ratio compared to the alloy refined traditionally with Dursalit EG 281 and grain refining with titanium-boron and modified with sodium. The higher values of mechanical properties and fatigue strength parameters were obtained for the alloy simultaneously barbotage-refined with argon and grain refining with titanium-boron and modified with strontium.

Influence of Post Weld Heat Treatment on Microstructure and Mechanical Properties of Friction Stir-Welded 2014Al-T6 Alloy

2011 ◽  
Vol 409 ◽  
pp. 299-304 ◽  
Author(s):  
Z. Zhang ◽  
B.L. Xiao ◽  
Zong Yi Ma
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Artificial Aging ◽  
Aging Treatment ◽  
Post Weld Heat Treatment ◽  
Grain Structure ◽  
Nugget Zone ◽  
Friction Stir ◽  
Rotation Rates ◽  
Microstructure And Mechanical Properties

5 mm thick 2014Al-T6 alloy plates were friction stir welded at the welding speeds of 100-400 mm/min and the rotation rates of 400-800 rpm. The influence of post weld artificial aging and T6 treatments on the microstructure and mechanical properties of FSW 2014Al-T6 joints were investigated. It was found that artificial aging did not alter the grain structure but T6 heat treatment caused the abnormal grain growth at the nugget zone. The tensile strength of the joints could not be enhanced by the artificial aging treatment but were improved by the T6 treatment. The effectiveness of T6 treatment is related with the distribution of “S” line.

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