The effects of prolonged thermal exposure on the mechanical properties and fracture toughness of C458 aluminum–lithium alloy

As a heat treatable aluminum alloy to be used in T6 and T8 temper, belongs to Al-Cu-Li system, a novel high-strength aluminum-lithium alloy 2A97 was developed. In order to improve the relationships of strength and ductility and fracture toughness, and to urge the applications in the aeronautical and aerospace industries, the effects of normal heat treatments and thermomechanical heat treatments on the mechanical properties and fracture toughness were investigated by Transmission Electron Microscope(TEM), Scanning Electronic Microscope (SEM), tensile test, and fracture toughness test. The results show that for the alloy aged at 135 °C for 24 h after quenching and 4 percent plastic deformation, its microstructures are strengthened by strain hardening and precipitation hardening, consisting of fine T1phase, θ″/θ′ phase and δ′ phase densely and homogeneously distributed in the matrix. It yields optimum relationship of strength and ductility, fracture toughness, its σ0.2, σband δ5are 454 MPa, 536 MPa, and 11.8%, respectively. It yields 43.5 MPa·m1/2of Kqvalues higher than that of 42.5 MPa·m1/2 in T6 temper. The fracture morphologies of impact tensile samples of fracture toughness test and normal tensile test were observed, indicating the dominance of intergranular failure and subintergranular failure with some dimples and trangranular failure.

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ТHE INFLUENCE OF HOMOGENIZING ANNEALING REGIMES ON THE STRUCTURAL PHASE STATE AND MECHANICAL PROPERTIES OF ALUMINUM-LITHIUM ALLOY 1441 INGOTS

Proceedings of VIAM ◽

10.18577/2307-6046-2019-0-3-44-52 ◽

2019 ◽

pp. 44-52

Author(s):

V.V. Antipov ◽

◽

E.A. Tkachenko ◽

D.V. Zajtsev ◽

A.A. Selivanov ◽

...

Keyword(s):

Mechanical Properties ◽

Phase State ◽

Structural Phase ◽

Structural Phase State ◽

Homogenizing Annealing ◽

Lithium Alloy ◽

Aluminum Lithium Alloy ◽

Aluminum Lithium

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The Influence of Aging Process on Microstructures and Properties of an Al-2.54Li-1.61Cu-1.23Mg-0.22Zr Alloy

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.353-358.699 ◽

2007 ◽

Vol 353-358 ◽

pp. 699-702

Author(s):

Qi Nian Shi ◽

Wei Hao Xiong ◽

Sheng Guo Liu

Keyword(s):

Mechanical Properties ◽

Rapid Solidification ◽

Aging Process ◽

Second Phase ◽

Lithium Alloy ◽

Aluminum Lithium Alloy ◽

Final Aging ◽

Aluminum Lithium ◽

Free Band ◽

Microstructures And Mechanical Properties

The influence of aging process on microstructures and mechanical properties of a rapid solidification Aluminum-Lithium alloy has been analyzed in this paper. The results show that the better aging process is as follows: heating to 170oC for 4 hours and then followed by a final aging at about 190 oC for 18 hours. A lot of fine participated second phase such as δ′ in matrix and a narrow participation free band make alloy’s good performance.

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Improvement of Fracture Toughness of Aluminum-Lithium Alloy 8090 Plate by Double Aging.

Journal of the Society of Materials Science Japan ◽

10.2472/jsms.45.656 ◽

1996 ◽

Vol 45 (6) ◽

pp. 656-660 ◽

Cited By ~ 1

Author(s):

Shuhei OHSAKI ◽

Kazunori KOBAYASHI ◽

Kazuhiko YOSHINO ◽

Makio IINO ◽

Toshimasa SAKAMOTO

Keyword(s):

Fracture Toughness ◽

Double Aging ◽

Lithium Alloy ◽

Aluminum Lithium Alloy ◽

Aluminum Lithium

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2099 T83, T8E67

Alloy Digest ◽

10.31399/asm.ad.al0398 ◽

2005 ◽

Vol 54 (12) ◽

Keyword(s):

Fracture Toughness ◽

Compressive Strength ◽

Corrosion Resistance ◽

Physical Properties ◽

Tensile Properties ◽

High Strength ◽

Lithium Alloy ◽

Aluminum Lithium Alloy ◽

Aluminum Lithium

Abstract The aluminum-lithium alloy 2099, also designated C460, was developed for use in aerospace and high-strength applications. The alloy has a lithium addition for lowered density compared to more conventional alloys. This datasheet provides information on composition, physical properties, tensile properties, and compressive strength as well as fracture toughness and fatigue. It also includes information on corrosion resistance as well as forming. Filing Code: AL-398. Producer or source: AEAP-Alcoa Engineered Aerospace Products.

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