Hostname: page-component-848d4c4894-pjpqr Total loading time: 0 Render date: 2024-06-22T10:46:17.040Z Has data issue: false hasContentIssue false
  • English
  • Français

Precipitation of T1 phase in 2198 Al–Li alloy studied by atomic-resolution HAADF-STEM

Published online by Cambridge University Press:  07 May 2019

Kexin Lv ,
Chenyang Zhu Open the ORCID record for Chenyang Zhu [Opens in a new window] ,
Jingxu Zheng ,
Xiaodong Wang  and
Bin Chen Open the ORCID record for Bin Chen [Opens in a new window]
Kexin Lv
Affiliation:
School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
Chenyang Zhu
Affiliation:
School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
Jingxu Zheng
Affiliation:
School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
Xiaodong Wang
Affiliation:
School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
Bin Chen*
Affiliation:
School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
*
a)Address all correspondence to this author. e-mail: steelboy@sjtu.edu.cn
Get access

Abstract

Aging treatment plays an important role in strengthening of 2198 Al–Li alloy. Through a serious of heat treatment processes, a large amount of precipitates emerge, mainly observed to be θ′(Al2Cu), Al3Zr, and T1(Al2CuLi), among which, T1 turns to be the most important precipitate that contributes to the strengthening of 2198 Al–Li alloy. While the temperature of the aging process is 175 °C, the density and size of T1 phase keep increasing through the process and reach peak in about 18 h. T1 phase tends to have a certain orientation relationship of ${\left( {0001} \right)_{{{\rm{T}}_1}}}//{\left\{ {111} \right\}_{{\rm{Al}}}}$, ${\left\langle {1010} \right\rangle _{{{\rm{T}}_{\rm{1}}}}}//{\left\langle {110} \right\rangle _{{\rm{Al}}}}$ and may have different kinds of multilayered structures. In most of the multilayered structures, the distance between two adjacent copper-rich laths is less than that in classical single-layered phase. Thus, it can be inferred that the microstructure of T1 phase might change in the process of developing from single-layered structure to multilayered structure. In addition, the interactions between different phases become relatively frequent when the density of T1 phase reaches a threshold.

Keywords

aging2198 Al–Li alloyT1 phaseHAADF-STEMGPA
Type
Article
Information
Journal of Materials Research , Volume 34 , Issue 20 , 28 October 2019 , pp. 3535 - 3544
Copyright
Copyright © Materials Research Society 2019 

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Araullo-Peters, V., Gault, B., Geuser, F.D., Deschamps, A., and Cairney, J.M.: Microstructural evolution during ageing of Al–Cu–Li–x alloys. Acta Mater. 66, 199 (2014).CrossRefGoogle Scholar
Huang, G. and Wang, L.: Development, application and prospect of aluminum–lithium alloys. Mater. Rev. 11, 21 (1997).Google Scholar
Rioja, R.J.: The evolution of Al–Li base products for aerospace and space applications. Metall. Mater. Trans. A 43, 3325 (2012).CrossRefGoogle Scholar
Wang, H., Shi, C., Jia, Z., and Zeng, W.: Development and current status of aluminum–lithium alloy. Hot Work. Technol. 12, 146 (2012).Google Scholar
Zhang, S.F., Zeng, W.D., Yang, W.H., Shi, C.L., and Wang, H.J.: Ageing response of a Al–Cu–Li 2198 alloy. Mater. Des. 63, 368 (2014).CrossRefGoogle Scholar
Dursun, T. and Soutis, C.: Recent developments in advanced aircraft aluminium alloys. Mater. Des. 56, 862 (2014).CrossRefGoogle Scholar
Heinz, A., Haszler, A., Keidel, C., Moldenhauer, S., Benedictus, R., and Miller, W.S.: Recent development in aluminium alloys for aerospace applications. Mater. Sci. Eng., A 280, 102 (2000).CrossRefGoogle Scholar
Giummarra, C., Rioja, R.J., Bray, G.H., Magnusen, P.E., and Moran, J.P.: Al–Li alloys: Development of corrosion resistant, high toughness aluminium–lithium aerospace alloys. Proc. ICCA 1, 176 (2008).Google Scholar
Ahmed, B. and Wu, S.J.: Aluminum lithium alloys (Al–Li–Cu–X)-new generation material for aerospace applications. Appl. Mech. Mater. 440, 104 (2013).CrossRefGoogle Scholar
Gamboni, O.C., Moreto, J.A., Bonazzi, L.H.C., Ruchert, C.O.F.T., and Bose Filho, W.W.: Effect of salt-water fog on fatigue crack nucleation of Al and Al–Li alloys. Mater. Res. 17, 250 (2014).CrossRefGoogle Scholar
Tsao, C.S., Lin, T.L., and Yu, M.S.: An improved small-angle X-ray scattering analysis of δ′ precipitation in Al–Li alloy with hard-sphere interaction. Scr. Mater. 41, 81 (1999).CrossRefGoogle Scholar
Chen, S.W. and Huang, C.C.: Solidification curves of Al Cu, Al Mg, and Al Cu Mg alloys. Acta Mater. 44, 1955 (1996).CrossRefGoogle Scholar
Xin-Yu, L.Ü., Guo, E.J., Rometsch, P., and Wang, L.J.: Effect of one-step and two-step homogenization treatments on distribution of Al3Zr dispersoids in commercial AA7150 aluminium alloy. Trans. Nonferrous Met. Soc. China 22, 2645 (2012).Google Scholar
Decreus, B., Deschamps, A., and Donnadieu, P.: Understanding the mechanical properties of 2198 Al–Li–Cu alloy in relation with the intra-granular and inter-granular precipitate microstructure. J. Phys.: Conf. Ser. 240, 012096 (2010).Google Scholar
Gao, C., Zhu, Z., Han, J., and Li, H.: Correlation of microstructure and mechanical properties in friction stir welded 2198-T8 Al–Li alloy. Mater. Sci. Eng., A 639, 489 (2015).CrossRefGoogle Scholar
Shen, Y.Z., Oh, K.H., and Lee, D.N.: Serrated flow behavior in 2090 Al–Li alloy. Key Eng. Mater. 345–346, 157 (2007).CrossRefGoogle Scholar
Pardoen, T., Marchal, Y., and Delannay, F.: Thickness dependence of cracking resistance in thin aluminium plates. J. Mech. Phys. Solids 47, 2093 (1999).CrossRefGoogle Scholar
Kaufman, M.J., Morrone, A.A., and Lewis, R.E.: Complications concerning TEM analysis of the δ-AlLi phase in aluminum–lithium alloys. Scr. Metall. Mater. 27, 1265 (1992).CrossRefGoogle Scholar
Alekseev, A.A., Lukina, E.A., Zaytsev, D.V., and Fridlyander, I.N.: Crystal analysis of nonequilibrium δnon-phase in Al–Li–Mg alloys. Mater. Sci. Forum 519–521, 259 (2006).CrossRefGoogle Scholar
Mao, B.P., Yan, X.D., and Shen, J.: Precipitation behavior of T1 phase during thermo-mechanical treatment of 2197 Al–Li alloy. Chin. J. of Nonferrous Met. 25, 2366 (2015).Google Scholar