Mechanical behaviour of aluminium-lithium alloys

Prasad, N. Eswara; Gokhale, A.M.; Rao, P. Rama

doi:10.1007/bf02717134

Cited by 91 publications

(33 citation statements)

References 84 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The observations are in agreement with Lin et al [20], whose TEM micrographs report the presence of continuous secondary phases and precipitate-free zone at grain boundaries, which act as stress concentration sites for crack initiation. The intergranular fracture mode in the peak-aged condition is also confirmed by others [3,27,32].…”

Section: Tensile Testssupporting

confidence: 69%

See 1 more Smart Citation

Thermal stability of the lightweight 2099 Al-Cu-Li alloy: Tensile tests and microstructural investigations after overaging

Balducci

Ceschini

Messieri³

et al. 2017

Materials & Design

View full text Add to dashboard Cite

Highlights• Lightweight AA2099(Al-Cu-Li) exhibits a thermal stability comparable or even higher than other Al-Cu alloys specifically developed for high temperature applications.• Overaged AA2099 showed high residual hardness and tensile strength, suggesting its potential use in high temperature (yet lighter) automotive components.• STEM investigations revealed the superior thermal stability of the T1 phase (typical of AlCu-Li alloys) compared to ϑ and S. AbstractThe thermal stability of the lightweight, T83 heat treated 2099 Al-Cu-Li alloy was assessed in the temperature range 200-305°C, through both hardness and tensile tests. After prolonged overaging, the alloy exhibited a better performance compared to aluminium alloys specifically developed for high temperature applications, with the advantage of a considerable lower density. The tensile behaviour was modelled through Hollomon's equation as a function of residual hardness. The changes in the alloy performance were explained through both SEM and STEM investigations. 2Microstructural analyses gave evidence of Ostwald ripening, while fractographic analyses revealed a transition from an intergranular to a ductile fracture mechanism in the overaged alloy. STEM investigations highlighted the superior thermal stability of the T1 phase compared to ϑ and S strengthening phases, which dissolved during overaging at 245°C. The study underlines the need to enhance the formation of T1 precipitates when high temperature strength is required. The results of the present study suggest that the 2099 alloy is a very promising candidate for automotive engine components, which are extremely demanding in terms of both thermal resistance and lightweight. Graphical abstract KeywordsAl-Cu-Li alloy; Thermal effect; Hardness test; Tensile test; Microstructure; STEM.

show abstract

Section: Tensile Testssupporting

confidence: 69%

“…Representative OM micrographs, both in the longitudinal and transverse directions, are reported in Fig.3, and reveal the typical unrecrystallized microstructure of T8 Al-Cu-Li alloys [2,3,11,27,28], with grains elongated along the extrusion direction. …”

Section: Starting Materialsmentioning

confidence: 99%

Thermal stability of the lightweight 2099 Al-Cu-Li alloy: Tensile tests and microstructural investigations after overaging

Balducci

Ceschini

Messieri³

et al. 2017

Materials & Design

View full text Add to dashboard Cite

show abstract

“…Ligas de alumínio, por apresentarem as características desejadas, vem sendo objeto de pesquisa [1][2][3][4][5][6][7][8][9], em especial ligas de alumínio-lítio [10][11][12], que mantém essas características mesmo em baixas temperaturas. A adição de 1% em peso de Lítio gera, aproximadamente, uma redução de 3% na densidade da liga, além de aumentar o módulo elástico em cerca de 6% [13].…”

Section: Ivan Moroz Nelson Guedes De Alcântara Jorge Fernandes Dos unclassified

[No Title Available]

Moroz

Alcântara

Santos³

2012

Soldag. insp.

View full text Add to dashboard Cite

show abstract

“…[8,9] After water quenching from the solution temperature the components were aged for 17 hrs at 160°C under argon atmosphere. According to literature, the primary strengthening phase Al 3 Li was formed.…”

Section: Strengthening Effects During Heat Treatmentmentioning

confidence: 99%

“…According to literature, the primary strengthening phase Al 3 Li was formed. [8] Due to the limitations of the EDX the existence of nanometer-sized Al 3 Li could not be verified. With the aid of the ageing treatment a remarkable increase in strength and elongation was achieved.…”

Section: Strengthening Effects During Heat Treatmentmentioning

confidence: 99%

Semi‐Solid Processing of Tailored Aluminium‐Lithium Alloys for Automotive Applications

Sauermann¹,

Friedrich²,

Bünck³

et al. 2007

Adv Eng Mater

View full text Add to dashboard Cite

This paper describes the development and evaluation of thixoformable Al‐Li‐Mg‐based alloys performed at the collaborative research center SFB 289, RWTH Aachen. Scandium and zirconium were added to AlLi2.1Mg5.5 (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 semi‐solid processed connecting rods were manufactured by the rheo container process (RCP). Subsequent heat treatment raised the mechanical properties to maximum values of tensile strength, 430 MPa, yield strength of 250 MPa, and an elongation to fracture of 13 %. The RCP process was designed for the special requirements of highly reactive alloys. The paper presents the remarkable property and process benefits of the semi‐solid processing of Al‐Li alloys.

show abstract

Mechanical behaviour of aluminium-lithium alloys

Cited by 91 publications

References 84 publications

Thermal stability of the lightweight 2099 Al-Cu-Li alloy: Tensile tests and microstructural investigations after overaging

Thermal stability of the lightweight 2099 Al-Cu-Li alloy: Tensile tests and microstructural investigations after overaging

[No Title Available]

Semi‐Solid Processing of Tailored Aluminium‐Lithium Alloys for Automotive Applications

Contact Info

Product

Resources

About