Damage Tolerance Capability of an Al-Cu-Mg-Ag Alloy (2139)

Abstract

The effects of dispersoid forming elements on the mechanical properties of Al-Cu- Mg-Ag alloys are examined. It is found that a small amount of Zr addition is detrimental to the damage tolerance of Al-Cu-Mg-Ag alloys in artificially aged temper, while Mn addition is beneficial. The superior damage tolerance capability of Alloy 2139 is demonstrated by comparing it to other high performance alloys used for DT critical applications

Microstructural Characterization of a High-Strength Aluminum Alloy Subjected to High Strain-Rate Impact

“…[8] A dislocation multiple cutting mechanism was also proposed as one strengthening mechanism for the X precipitate under quasi-static loading. [9] The X precipitate nucleates more readily in the grain matrix than other precipitates [1] without the tendency for nucleation at dislocation lines or grain boundaries (GBs). [7,10] The precipitate h¢ (Al 2 Cu) forms as plates on the {100} a planes of Al-Cu based alloys with a tendency to precipitate on dislocation lines [4] and low-angle GBs.…”

“…DUE to advances in heat treatments and metallurgical processing techniques, precipitate and dispersoid distributions have been used to increase strength and toughness in alloys, such as Al 2139, [1] which can be applied for a myriad of civilian and military applications. This alloy has significant strength and ductility under high strain-rate loading conditions [2] along with improved ballistic behavior in comparison with 7*** and 5*** series aluminum alloys previously used in military applications.…”

“…This alloy has significant strength and ductility under high strain-rate loading conditions [2] along with improved ballistic behavior in comparison with 7*** and 5*** series aluminum alloys previously used in military applications. [3] Cho and Bes [1] reported that strengthening constituents, precipitates X and h¢, and Mn-containing dispersed particles were present in the Al 2139 alloy. The composition and the quasi-static and dynamic properties of the alloy are given in Tables I and II. The precipitation of X (Al 2 Cu) as plates on the {111} a planes occurs in Al-Cu-Mg based alloys with high Cu:Mg ratios, and it can be enhanced by the presence of Ag.…”

“…Composition of Al 2139[1] *PHILIPS is a trademark of FEI Company, Hillsboro, OR. **JEOL is a trademark of Japan Electron Optics Ltd., Tokyo.…”

Evolution of voids during ductile crack propagation in an aluminium alloy sheet toughness test studied by synchrotron radiation computed tomography

“…Fracture toughness is a crucial material design criterion for many high strength materials applications [1,2]. Historically, two dimensional (2D) surface imaging techniques, such as optical and electron microscopy, have been used to reveal fracture micromechanisms [3,4].…”