Lithium depletion during heat treatment of aluminum-lithium alloys

1986 ◽  
Vol 17 (4) ◽  
pp. 635-643 ◽  
Author(s):  
J. M. Papazian ◽  
R. L. Schulte ◽  
P. N. Adler
Keyword(s):  
Heat Treatment ◽  
Aluminum Lithium ◽  
Lithium Depletion ◽  
Aluminum Lithium Alloys ◽  
Lithium Alloys

A Study on Post Weld Heat Treatment of Friction Stir Welded Al2195 Blank for Spin Forming

2015 ◽  
Vol 1125 ◽  
pp. 190-194
Author(s):  
Jong Hoon Yoon ◽  
Joon Tae Yoo ◽  
Kyung Ju Min ◽  
Ho Sung Lee
Keyword(s):  
Heat Treatment ◽  
Treatment Process ◽  
Heat Treatment Process ◽  
Friction Stir ◽  
Aluminum Lithium ◽  
Materials Research ◽  
Superior Mechanical Properties ◽  
Increased Strength ◽  
Aluminum Lithium Alloys ◽  
Lithium Alloys

It is well known that the significant weight reduction and increased strength have placed advanced aluminum-lithium alloys at the forefront of aerospace materials research. For example the use of aluminum-lithium based alloys for rocket fuel tank domes can reduce weight because aluminum-lithium alloys have lower density and higher strength than Al-Cu alloy 2219. However, Al-Li alloys have been shown the inherent low formability characteristic that make them susceptible to cracking during the spinning operations. In this study a novel heat treatment process on the formability of friction stir welded Al-Li alloy blanks are presented. It is shown that the successful heat treatment process has been developed with superior mechanical properties and currently the patent is applied.

Study of the heat treatment effect on the structure and mechanical properties welded joints of aluminum-lithium alloys V-1461 and V-1469

2019 ◽  
Vol 85 (7) ◽  
pp. 28-35
Author(s):  
Aleksey A. Skupov ◽  
Aleksey V. Scherbakov ◽  
Svetlana V. Sbitneva ◽  
Eva A. Lukina
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Rare Earth ◽  
Welded Joints ◽  
Artificial Aging ◽  
Welded Joint ◽  
Filler Materials ◽  
Aluminum Lithium ◽  
Aluminum Lithium Alloys ◽  
Lithium Alloys

The use of rare earth elements for alloying of aluminum alloys is a promising direction nowadays — filler materials doped with rare earth metals (REM) improve the mechanical properties of welded joints of high-strength aluminum-lithium alloys compared to serial filler material. The results of studying the effect of the composition of alloyed filler materials Sv1209 and Sv1221 and heat treatment mode on the mechanical properties and structure of welded joints of high-strength aluminum-lithium alloys B-1461 and B-1469 are presented. It is shown that the use of filler materials alloyed with rare earth metals in combination with full heat treatment (quenching and artificial aging) carried out after welding provide an increase in the strength characteristics of the welded joint to the level of strength of the base material with sufficiently high ductility and toughness. Metallographic study of welded joints after heat treatment revealed a fine-grained structure in the center of welds attributed to alloying of the filler with REM. Transmission electron microscopy is used to study precipitated hardening phases in welded joints. The round-shaped phase Al3(Sc, Zr) and a fine δ’-phase precipitated upon cooling of the welded joint are present in weld adjacent zone of V-1469 alloy. At the same time, artificial aging after welding results in formation of copper-containing Ω’- and θ’-phases. Quenching and artificial aging of the welded joint resulted in an increase in the size of precipitated hardening T1’-, S’-, θ’-phases and density of their distribution in the grain volume in the heat-affected zone of V-1461 alloy. Thus, heating upon welding leads to uneven phase precipitation, whereas additional artificial aging aggravates the non-uniformity of decomposition through partial dissolution of some phases and coarsening of the other.

Development of Aluminum-Lithium Alloys Processed by the Rheo Container Process

2006 ◽  
Vol 116-117 ◽  
pp. 513-517 ◽  
Author(s):  
Roger Sauermann ◽  
Bernd Friedrich ◽  
T. Grimmig ◽  
M. Buenck ◽  
Andreas Bührig-Polaczek
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Tensile Strength ◽  
Collaborative Research ◽  
Induction Melting ◽  
High Quality ◽  
Aluminum Lithium ◽  
Semi Solid ◽  
Aluminum Lithium Alloys ◽  
Lithium Alloys

This investigation describes the development and evaluation of thixoformable alloys on Al-Li-Mg basis in the scope of the collaborative research center SFB 289 at RWTH Aachen University. Scandium and zirconium was added to Al-Li2.1-Mg5.5 (A1420) with the aid of DoE (Design of Experiments) and precursor billets were manufactured by pressure induction melting (PIM). To evaluate the thixoformability of the synthesized alloys high-quality semi solid processed demonstrators were manufactured by the Rheo-Container-Process. Subsequent heat treatment raised the mechanical properties to maximum values of tensile strength of 432MPa, yield strength of 220MPa and an elongation of 13%. The RCP-Process was designed for the special requirements of this high reactive alloy. The paper will present extraordinary benefits in terms of properties and process simpleness for the semi-solid processing of Al-Li alloys.

HEAT TREATMENT INFLUENCE ON CHARACTERISTICS OF WELDING JOINTS OF HIGH-STRENGTH ALUMINUM-LITHIUM ALLOYS

2015 ◽  
Vol 0 (4) ◽  
pp. 6-6 ◽  
Author(s):  
V.I. Lukin ◽  
◽  
E.N. Ioda ◽  
M.D. Panteleev ◽  
A.A. Scupov ◽  
...  
Keyword(s):  
Heat Treatment ◽  
High Strength ◽  
Aluminum Lithium ◽  
Welding Joints ◽  
Aluminum Lithium Alloys ◽  
Lithium Alloys

POROSITY DEVELOPMENT DURING HEAT TREATMENT OF ALUMINUM-LITHIUM ALLOYS

1987 ◽  
Vol 48 (C3) ◽  
pp. C3-513-C3-519 ◽  
Author(s):  
J. M. PAPAZIAN ◽  
J. P.W. WAGNER ◽  
W. D. ROONEY
Keyword(s):  
Heat Treatment ◽  
Aluminum Lithium ◽  
Aluminum Lithium Alloys ◽  
Lithium Alloys ◽  
Porosity Development

scholarly journals Investigation of the phase composition and mechanical characteristics of laser welded joints of aluminum-lithium alloys

2021 ◽  
Vol 2077 (1) ◽  
pp. 012011
Author(s):  
A G Malikov ◽  
A.I. Ancharov
Keyword(s):  
Heat Treatment ◽  
Phase Composition ◽  
Welded Joints ◽  
Mechanical Characteristics ◽  
Base Alloy ◽  
Structural Phase ◽  
Post Heat Treatment ◽  
Aluminum Lithium ◽  
Aluminum Lithium Alloys ◽  
Lithium Alloys

Abstract A study of laser welding of modern aluminum-lithium alloys has been carried out. Optimization of post heat treatment of laser welded joints has been carried out. The change in the structural-phase composition of welded joints was investigated. The strength of welded joints after heat treatment was equal to the strength of the base 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.

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.

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