Plasma welding of high-strength aluminum alloys

2020 ◽  
Vol 2020 (7) ◽  
pp. 3-11
Author(s):  
Viktor Ovchinnikov ◽  
Ruslan Rastopchin
Keyword(s):  
High Strength ◽  
Plasma Welding ◽  
Tungsten Electrode ◽  
Fine Grained ◽  
Hollow Anode ◽  
Aluminum Lithium ◽  
Pulse Feed ◽  
Fine Grained Structure ◽  
Aluminum Lithium Alloys ◽  
High Strength Aluminum Alloys

On the analysis basis of trends in the development of aluminum alloy plasma welding it is shown that in most cases for critical structures there is used welding with a non-consumable electrode on reversed polarity with adding wire material. A welding method with a hollow anode to increase non-consumable tungsten electrode durability is described. It is shown that to increase quality of welded joints in aluminum-lithium alloys the application of plasma-forming gas programmable pulse feed has promising outlooks. In this case side by side with the decrease of such defects as pores and oxide films the obtaining of more fine-grained structure in metal seams is marked.

Deformation and fracture behavior of an Al-Li-Cu-Mg-Zr alloy 8090

1990 ◽  
Vol 48 (4) ◽  
pp. 974-975
Author(s):  
D.M. Jiang ◽  
B.D. Hong
Keyword(s):  
High Strength ◽  
Deformation And Fracture ◽  
Fracture Behaviors ◽  
Aluminum Lithium ◽  
Carbon Fiber Reinforced Composites ◽  
Peak Aged ◽  
Aluminum Lithium Alloys ◽  
High Strength Aluminum Alloys ◽  
Lithium Alloys ◽  
Zr Alloy

Aluminum-lithium alloys have been recently got strong interests especially in the aircraft industry. Compared to conventional high strength aluminum alloys of the 2000 or 7000 series it is anticipated that these alloys offer a 10% increase in the stiffness and a 10% decrease in density, thus making them rather competitive to new up-coming non-metallic materials like carbon fiber reinforced composites.The object of the present paper is to evaluate the inluence of various microstructural features on the monotonic and cyclic deformation and fracture behaviors of Al-Li based alloy. The material used was 8090 alloy. After solution treated and waster quenched, the alloy was underaged (190°Clh), peak-aged (190°C24h) and overaged (150°C4h+230°C16h). The alloy in different aging condition was tensile and fatigue tested, the resultant fractures were observed in SEM. The deformation behavior was studied in TEM.

The Influence of Addition of the Rare Earth Elements on the Structure and Hardness of AlZn12Mg3.5Cu2.5 Alloy

2015 ◽  
Vol 226 ◽  
pp. 39-42
Author(s):  
Rafał Michalik ◽  
Tomasz Mikuszewski
Keyword(s):  
Rare Earth ◽  
Automotive Industry ◽  
Electrical Power ◽  
High Strength ◽  
Hardness Test ◽  
Relative Strength ◽  
Zinc Alloys ◽  
Fine Grained ◽  
Fine Grained Structure ◽  
High Strength Aluminum Alloys

Aluminium alloys are characterized by a number of advantageous properties , which include: low density ,high relative strength , high electrical and thermal conductivity , ease of machining and good dumping features. Particular interesting are high-strength aluminum alloys of zinc, magnesium and copper. These alloys are used mainly in aircraft, building &structure, electrical, electrical power and automotive industry. A significant problem associated with the use of high-strength aluminium-zinc alloys is their insufficient resistance to corrosion. Improvement of corrosion resistance can be obtained by application of alloy micro-additives. The article shows results of examinations related to influence of rare earth additive on the structure and hardness of AlZn12Mg3.5Cu2.5 alloy. The scope of examination included: structure testing using scanning microscope, X – ray microanalysis, hardness test. Examinations have shown higher hardness of samples with rare earth additives. Was found , that rare earth addition influences on more fine –grained structure of the AlZn12Mg3.5Cu2.5 alloy.

Precipitation in Al-Li-Zr alloys

1992 ◽  
Vol 50 (1) ◽  
pp. 186-187
Author(s):  
D.M. Vanderwalker
Keyword(s):  
Fracture Toughness ◽  
Precipitation Hardening ◽  
Weight Ratio ◽  
High Strength ◽  
Transmission Electron ◽  
Water Quench ◽  
Aluminum Lithium ◽  
Aluminum Lithium Alloys ◽  
Lithium Alloys ◽  
Zr Alloys

Aluminum-lithium alloys have a low density and high strength to weight ratio. They are being developed for the aerospace industry.The high strength of Al-Li can be attributed to precipitation hardening. Unfortunately when aged, Al-Li aquires a low ductility and fracture toughness. The precipitate in Al-Li is part of a sequence SSSS → Al3Li → AlLi A description of the phases may be found in reference 1 . This paper is primarily concerned with the Al3Li phase. The addition of Zr to Al-Li is being explored to find the optimum in properties. Zirconium improves fracture toughness and inhibits recrystallization. This study is a comparision between two Al-Li-Zr alloys differing in Zr concentration.Al-2.99Li-0.17Zr(alloy A) and Al-2.99Li-0.67Zr (alloy B) were solutionized for one hour at 500oc followed by a water quench. The specimens were then aged at 150°C for 16 or 40 hours. The foils were punched into 3mm discs. The specimens were electropolished with a 1/3 nitric acid 2/3 methanol solution. The transmission electron microscopy was conducted on the JEM 200CX microscope.

Influence of Physical Properties of B4C Powder on the Strength Properties of the Ceramics Manufactured by SPS Sintering

2015 ◽  
Vol 1085 ◽  
pp. 312-315
Author(s):  
Oleg L. Khasanov ◽  
Edgar S. Dvilis ◽  
Zulfa G. Bikbaeva ◽  
Valentina V. Polisadova ◽  
Alexey O. Khasanov ◽  
...  
Keyword(s):  
Physical Properties ◽  
Boron Carbide ◽  
Physical And Mechanical Properties ◽  
High Strength ◽  
Strength Properties ◽  
Carbide Powder ◽  
Fine Grained ◽  
Fine Grained Structure ◽  
Determining Factor ◽  
Sps Sintering

Ceramics samples in the form of a parallelepiped with high strength characteristics have been made. For the manufacture of the ceramics samples a powder mixture from submicron В4С powder with additives (1 wt%, 5 wt%, 10 wt%) of boron carbide nanopowder was used. The physical properties of the powder mixtures and strength properties of sintered ceramics have been studied. It was shown that the use of submicron fractions of the boron carbide powder together with nanoadditives is a determining factor in the formation of dense fine-grained structure providing improved physical and mechanical properties of the ceramics.

Peculiarities of high-strength aluminum-lithium alloys laser weldin

2016 ◽  
pp. 7-7 ◽  
Author(s):  
V.I. Lukin ◽  
◽  
E.N. Ioda ◽  
M.D. Panteleev ◽  
A.A. Skupov ◽  
...  
Keyword(s):  
High Strength ◽  
Aluminum Lithium ◽  
Aluminum Lithium Alloys ◽  
Lithium Alloys

scholarly journals Ultrasonic-promoted rapid TLP bonding of fine-grained 7034 high strength aluminum alloys

2017 ◽  
Vol 36 ◽  
pp. 354-361 ◽  
Author(s):  
Weibing Guo ◽  
Xuesong Leng ◽  
Tianmin Luan ◽  
Jiuchun Yan ◽  
Jingshan He
Keyword(s):  
Aluminum Alloys ◽  
High Strength ◽  
Fine Grained ◽  
Tlp Bonding ◽  
High Strength Aluminum Alloys

Aluminum Lithium Alloys (Al-Li-Cu-X)-New Generation Material for Aerospace Applications

2013 ◽  
Vol 440 ◽  
pp. 104-111 ◽  
Author(s):  
Bilal Ahmed ◽  
Su Jun Wu
Keyword(s):  
Aluminum Alloys ◽  
High Strength ◽  
Cost Effective ◽  
Weight Percent ◽  
Atomic Weight ◽  
Physical Metallurgy ◽  
Potential Candidate ◽  
Aluminum Lithium ◽  
Aluminum Lithium Alloys ◽  
Lithium Alloys

Significant advantages in weight reduction and increased strength have place advanced aluminum-lithium alloys at forefront of aerospace materials research. These alloys are being developed to fulfill the ever increasing need for high strength, high properties, light weight and cost effective for aerospace industry. Conventional aluminum alloys has long been in service for aerospace application. The addition of lithium to aluminum improves modulus and decrease density compared to conventional aluminum alloys. Atomic weight of lithium is 7 mass units compared to aluminum 23 mass units, hence there is density reduction of about 3% for each weight percent addition of lithium and about 6% increase in Youngs modulus. In principle weight saving for aerospace structural parts could reach up to 15 %. This paper examines effect of lithium addition on properties, physical metallurgy; various phases developed during processing of these alloys. The addition of Lithium to aluminum form coherent, low density Al3Li (δ׳) precipitates. However the binary alloys have poor mechanical properties which are attributed to strain localization and shearing of soft Al3Li (δ׳) precipitates. This problem has been solved by development of ternary and quaternary alloys containing copper and magnesium. In all aluminum-lithium alloys, small addition of zirconium or scandium is done to improve recrystallization. The new developed aluminum lithium alloys series Al-Li-Cu-X are potential candidate to replace existing conventional alloys in terms of enhanced properties with reduced density.

STRUCTURAL PROPERTIES AND ABRASIVE- WEAR RESISTANCE OF BRINAR 400 AND BRINAR 500 STEELS

Tribologia ◽  
2017 ◽  
Vol 273 (3) ◽  
pp. 67-75 ◽  
Author(s):  
Łukasz KONAT ◽  
Jerzy NAPIÓRKOWSKI ◽  
Beata BIAŁOBRZESKA
Keyword(s):  
Wear Resistance ◽  
Abrasive Wear ◽  
Sandy Loam ◽  
High Strength ◽  
Abrasive Wear Resistance ◽  
Martensitic Steels ◽  
Fine Grained ◽  
Carbide Phases ◽  
Fine Grained Structure ◽  
Steel Grades

In the paper, microstructures and the examination results of abrasive-wear resistance of steel grades Brinar 400 and Brinar 500 are presented. It was found on the grounds of light and electron scanning microscopy that these steels are characterised by subtle differences in microstructures, influencing their mechanical and usable properties. In as-delivered condition, the steels have fine-grained structure with post-martensitic orientation, containing few particles of carbide phases. Such microstructures of Brinar steels and the performed chemical analyses indicate that their properties are formed during specialised operations of thermo-mechanical rolling. Generally, it can be said that the examined steels were designed according to the accepted standards of material engineering, related to low-alloy, high-strength, and abrasive-wear resistant martensitic steels. According to the above, the obtained results of structural examinations of Brinar 400 and Brinar 500 steels were referred to real abrasive-wear indices obtained by the spinning bowl method with use of various abrasive soil masses. The tests carried-out in light soil (loamy sand), medium soil (sandy loam), and in heavy soil (loam), as well as hardness measurements showed strict dependence of abrasive-wear indices on microstructures and the heattreatment condition of the examined steels. Examination results of abrasive-wear resistance of Brinar steels were compared with those of steel 38GSA in normalised conditions.

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