Hostname: page-component-586b7cd67f-t8hqh Total loading time: 0 Render date: 2024-11-25T18:08:43.260Z Has data issue: false hasContentIssue false

Precipitation of (Si2−xAlx)Hf in an Al–Si–Mg–Hf Alloy

Published online by Cambridge University Press:  20 June 2017

Xueli Wang
Affiliation:
College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China
Zhiqiang Xie
Affiliation:
College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China
Huilan Huang
Affiliation:
College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China
Zhihong Jia*
Affiliation:
College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China
Guang Yang
Affiliation:
Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education and International Center for Dielectric Research, Xi’an Jiaotong University, Xi’an 710049, China
Lin Gu
Affiliation:
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
Qing Liu
Affiliation:
College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China
*
*Corresponding author. [email protected]
Get access

Abstract

The morphology, composition, and structure of precipitates in an Al–Si–Mg–Hf alloy after heat treatment at 560°C for 20 h were studied by means of Cs-corrected high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM), energy dispersive X-ray spectrometry (EDS), high-resolution transmission electron microscopy (HRTEM), and first-principle calculations. Precipitates with three kinds of morphologies were observed. The rectangular and square precipitates were predominantly (Si2−xAlx)Hf phases, while the nanobelt-like precipitate is the Si2Hf phase. First-principle calculations were used to show that the Si6 and Si8 sites were the most favorable sites for Al incorporation in the orthorhombic Si2Hf phase.

Type
Materials Science Applications
Copyright
© Microscopy Society of America 2017 

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

Cole, G.S. & Sherman, A.M. (1995). Lightweight materials for automotive applications. Mater Charact 35, 39.CrossRefGoogle Scholar
Furushiro, N. & Hori, S. (1985). A possible mechanism of phase transformation of Al3Hf from Ll2 to D022 during aging in a rapidly solidified Al-3hf-0.3si alloy. Acta Mater 33, 867872.CrossRefGoogle Scholar
Hallem, H. (2005). Precipitation behaviour and recrystallisation resistance in aluminium alloys with additions of hafnium, scandium and zirconium. PhD Thesis. Norwegian University of Science and Technology, Trondheim, Norway.Google Scholar
Hallem, H., Forbord, B. & Marthinsen, K. (2004). An investigation of dilute Al–Hf and Al–Hf–Si alloys. Mater Sci Eng A 387–389, 940943.CrossRefGoogle Scholar
Hori, S. & Furushiro, N. (1982). Structure of rapidly solidified Al-Hf alloys and its thermal stability. Proceedings of the 4th international conference on rapidly quenched metals, Osaka University, Sendai, Japan, 24–28 August 1981, pp. 1525–1528. Sendai: Japan Institute of Metals.Google Scholar
Hsu, C.J., Chang, C.Y., Kao, P.W., Ho, N.J. & Chang, C.P. (2006). Al–Al3Ti nanocomposites produced in situ by friction stir processing. Acta Mater 54, 52415249.CrossRefGoogle Scholar
Huis, M.A., van Chen, J.H., Sluiter, M.H.F. & Zandbergen, H.W. (2007). Phase stability and structural features of matrix-embedded hardening precipitates in Al–Mg–Si alloys in the early stages of evolution. Acta Mater 55, 21832199.CrossRefGoogle Scholar
Jia, Z.H. & Arnberg, L. (2008). Nanobelts in multicomponent aluminum alloys. Appl Phys Lett 93(093115), 13.CrossRefGoogle Scholar
Keith, E.K., David, C.D. & David, N.S. (2006). Criteria for developing castable, creep-resistant aluminum-based alloys – A review. Z Metallkd 97, 246265.Google Scholar
Kresse, G. & Furthmüller, J. (1996). Efficient iterative schemes for ab initio total-energy calculations using a plane-wave basis set. Phys Rev B 54, 1116911186.CrossRefGoogle ScholarPubMed
Miller, W.S., Zhuang, L., Bottema, J., Wittebrood, A.J., Smet, P.D., Haszler, A. & Vieregge, A. (2000). Recent development in aluminium alloys for the automotive industry. Mater Sci Eng A 280, 3749.CrossRefGoogle Scholar
Norman, A.F. & Tsakiropoulos, P. (1991). The microstrure and properties of rapidly solidified Al-Hf alloys. Mater Sci Eng A 134, 12341237.CrossRefGoogle Scholar
Pandey, S.K. & Suryanarayana, C. (1989). Structure and transformation behavior of a rapidly solidified Al-6.4wt.% Hf alloy. Mater Sci Eng A 111, 181187.CrossRefGoogle Scholar
Perdew, J.P., Chevary, J.A., Vosko, S.H., Jackson, K.A., Pederson, M.R., Singh, D.J. & Fiolhais, C. (1992). Atoms, molecules, solids, and surfaces: Applications of the generalized gradient approximation for exchange and correlation. Phys Rev B 46, 66716687.CrossRefGoogle ScholarPubMed
Ryum, N. (1975). Precipitation in an 1.78 wt percentage Hf alloy after rapid solidification. J Mater Sci 10, 20752081.CrossRefGoogle Scholar
Saha, S., Todorova, T.Z. & Zwanziger, J.W. (2015). Temperature dependent lattice misfit and coherency of Al3X (X=Sc, Zr, Ti and Nb) particles in an Al matrix. Acta Mater 89, 109115.CrossRefGoogle Scholar
Seidman, D.N., Marquis, E.A. & Dunand, D.C. (2002). Precipitation strengthening at ambient and elevated temperatures of heat-treatable Al(Sc) alloys. Acta Mater 50, 40214035.CrossRefGoogle Scholar
Smith, J.F. & Bailey, D.M. (1957). The structures of ZrGe2, HfSi2 and HfGe2 . Acta Cryst 10, 341342.CrossRefGoogle Scholar
Srinivasan, D. & Chattopadhyay, K. (2001). Metastable phase evolution and hardness of nanocrystalline Al–Si–Zr alloy. Mater Sci Eng A 304–306, 534539.CrossRefGoogle Scholar
Wang, X.L., Xing, Y., Huang, H.L., Li, Y.J., Jia, Z.H. & Liu, Q. (2015). Growth directions of precipitates in the Al–Si–Mg–Hf alloy using combined EBSD and FIB 3D-reconstruction techniques. Microsc Microanal 21, 588593.CrossRefGoogle ScholarPubMed
Zhu, Y.M., Weyland, M., Medhekar, N.V., Dwyer, C., Mendis, C.L., Hono, K. & Nie, J.F. (2015). On the prismatic precipitate plates in Mg-Ca-In alloys. Scripta Mater 101, 1619.CrossRefGoogle Scholar