Effect of precipitates on mechanical properties of AA2195

Kim, Jae-Hee; Jeun, Jeong-Hoon; Chun, Hyun-Jin; Lee, Ye Rim; Yoo, Joon-Tae; Yoon, Jong Hoon; Lee, Ho-Sung

doi:10.1016/j.jallcom.2016.01.229

Cited by 98 publications

(20 citation statements)

References 23 publications

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“…This approach leads to an optimal situation that corresponds to a high hardness value of 209.3 HV and hence a high level of strengthening is expected as well (Khushaim, 2019). Moreover, a recent study of AA2195 at T8 temper demonstrates a high tensile stress value of 574 MPa; and a high yield strength value of 540 MPa for these alloys (Kim et al, 2016). In our study, the contribution of every observed precipitate to the local stress of Al matrix was estimated as shown in Table 1.…”

Section: Resultsmentioning

confidence: 97%

“…The presence of different intermetallic phases in precipitation‐hardened Al‐alloys usually results from the presence of various micro‐alloying elements and adequate subsequent heat treatment applied to respective systems. Investigations of the relationships between the precipitation existing in the microstructure of the alloys and their mechanical properties have been conducted, and many important inroads have been made already (Bai, Liu, Hou, Zhao, & Xing, 2012; Khushaim, Boll, Seibert, Haider, & Al‐Kassab, 2015; Kim et al, 2016; Liu & Robertson, 2011). The local stresses under the elastic or Hook's Law approximation are below the yield strengths.…”

Section: Introductionmentioning

confidence: 99%

“…Investigations of the relationships between the precipitation existing in the microstructure of the alloys and their mechanical properties have been conducted, and many important inroads have been made already (Bai, Liu, Hou, Zhao, & Xing, 2012;Khushaim, Boll, Seibert, Haider, & Al-Kassab, 2015;Kim et al, 2016;Liu & Robertson, 2011).…”

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confidence: 99%

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Application of aberration‐corrected scanning transmission electron microscopy in conjunction with valence electron energy loss spectroscopy for the nanoscale mapping of the elastic properties of Al–Li–Cu alloys

Khushaim

Anjum

2020

Microscopy Res & Technique

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The stress and strain play an important role in strengthening of the precipitationhardened Aluminum (Al) alloys. Despite the determination of relationship between the mechanical properties and the precipitation existing in the microstructure of these alloys, a quantitative analysis of the local stress and the strain fields at the hardeningprecipitates level has been seldom reported. In this paper, the microstructure of a T8 temper AA2195 Al alloy is investigated using aberration corrected scanning transmission electron microscopy (AC-STEM). The strain fields in Al matrix in the vicinity of observed precipitates, namely T 1 and β 0 , are determined using geometric phase analysis (GPA). Young's modulus (Y m) mapping of the corresponding areas is determined from the valence electron energy loss spectroscopy (VEELS) measured bulk Plasmon energy (E p) of the alloys. The GPA-determined strains were then combined with VEELSdetermined Y m under the linear theory of elasticity to give rise the local stresses in the alloy. The obtained results show that the local stresses in Al matrix having no precipitates were in the range of 138 ± 2 MPa. Whereas, in the vicinity of thin and thick T 1 platelet shape precipitates, the stresses were found to be about 202 ± 3 MPa and 195 ±3 MPa, respectively. The stresses measured in the vicinity of β 0 spherical shape precipitates found out to be 140 ± 3 MPa which was near to the local stress value in Al matrix. Our findings suggest that the precipitate hardening in T8 temper AA2195 Al alloy predominantly stems from thin T 1 precipitates.

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Section: Resultsmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

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Application of aberration‐corrected scanning transmission electron microscopy in conjunction with valence electron energy loss spectroscopy for the nanoscale mapping of the elastic properties of Al–Li–Cu alloys

Khushaim

Anjum

2020

Microscopy Res & Technique

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“…2 Microstructure of (a) longitudinal and (b) transverse view from metallurgical microscope, and (c) precipitates from transmission electron microscope [9].…”

Section: Resultsmentioning

confidence: 99%

Characterization of Superplastic Behavior of AA2195 by Bulging Test

Lee¹,

Yoo²,

Min³

2016

Proceedings of the International Symposium on Mechanical Engineering and Material Science

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Abstract. Superplasticity is the ability of polycrystalline materials to deform plastically to exhibit very large strains. Using this property in manufacturing process makes many of aerospace components lighter and stiffer, with efficient energy and cost saving. Since in most sheet metal forming operation biaxial as well as uniaxial stress state exists, it is important to understand superplastic behavior as a function of stress state. The main requirement of superplastic deformation includes high strain rate sensitivity, lack of necking, limited range of strain rate, and elevated temperatures. In this study, materials properties of 2195 aluminum-lithium alloy during superplastic deformation were obtained from biaxial bulging test. Aluminum-lithium alloy is a light weight metal that has been used as substitute for conventional aerospace aluminum alloys. At constant gas pressure, the strain rate in which the metal sheet experiences varies and therefore the strain rate sensitivity can be obtained in a single loading. Tensile tests were performed at elevated temperature and materials parameters were compared with the one obtained from biaxial bulging tests.

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“…Reprecipitates may be achieved by applying proper thermal management including; process parameter and cooling rate. Kim et al [111] reported that the joint strength of the welded plate was improved by T 1 phase, and they explained that it restricts the dissolution movement. With the increasing aging temperature, density and size of T 1 precipitates also increases at grain boundary [101].…”

Section: Precipitates Distributionmentioning

confidence: 99%

Fabrication of third generation Al–Li alloy by friction stir welding: a review

Alam

Sinha

2019

Sādhanā

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Aerospace industry stimulates research for new materials to reduce the weight of it thereby reduction of fuel consumption. Aluminium-Lithium alloys have become a good alternative due to its inherent properties. Nevertheless, joining of these materials by traditional welding is difficult. Friction stir welding process considered as an ideal joining process for these materials due to low heat input. This paper reviews the fabrication of the latest generation of Al-Li alloy by friction stir welding. In addition, it also presents and discusses the effect of process parameters on microstructure, mechanical properties and precipitate distribution in friction stir welded joint of Al-Li alloy.

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Effect of precipitates on mechanical properties of AA2195

Cited by 98 publications

References 23 publications

Application of aberration‐corrected scanning transmission electron microscopy in conjunction with valence electron energy loss spectroscopy for the nanoscale mapping of the elastic properties of Al–Li–Cu alloys

Application of aberration‐corrected scanning transmission electron microscopy in conjunction with valence electron energy loss spectroscopy for the nanoscale mapping of the elastic properties of Al–Li–Cu alloys

Characterization of Superplastic Behavior of AA2195 by Bulging Test

Fabrication of third generation Al–Li alloy by friction stir welding: a review

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