Browse > Article
http://dx.doi.org/10.7777/jkfs.2014.34.2.054

A Study on Mechanical Characteristic of Hydrogen Charged Al-6.3Zn-2.4Mg Alloy  

Kim, Dae-Hwan (Dept. of Metallurgical and Materials Engineering, Gyeongsang National University, Engineering Research Institute)
Choi, Tae-Young (Dept. of Metallurgical and Materials Engineering, Gyeongsang National University, Engineering Research Institute)
Shim, Sung-Young (Research Institute for Green Energy Convergence Technology)
Lim, Su-Gun (Dept. of Metallurgical and Materials Engineering, Gyeongsang National University, Engineering Research Institute)
Publication Information
Journal of Korea Foundry Society / v.34, no.2, 2014 , pp. 54-59 More about this Journal
Abstract
In this study, the extruded Al-6.3Zn-2.4Mg alloys were selected among the 7000 series aluminum alloys sensitive to hydrogen environment in order to examine the effects of both the aging conditions and the length of hydrogen charging period on the mechanical properties of the alloy. The specimens were aged for 24hours at $100^{\circ}C$ (under aging (UA)), $120^{\circ}C$ (peak aging (PA)), and $160^{\circ}C$ (over aging (OA)), respectively. Charging tests were performed at RT for 12, 24, 36 hours under potentiostatic conditions (-2000 mV vs (Ag/AgCl)) for 12, 24 and 36 hours in 1M $H_2SO_4$ and 0.1%$NH_4SCN$ solution. The fracture surface was examined by scanning electron microscopy (SEM). X-ray diffraction (XRD) pattern in peak aged sample was obtained before and after hydrogen charging from extruded Al-6.3Zn-2.4Mg alloys. The decreasing rate of tensile strength and elongation is represented in order of over aging < under aging < peak aging, and it is believed that the hydrogen recharge is more sensitive to elongation than tensile strength. The formation of $AlH_3$ in hydrogen charged Al-6.3Zn-2.4Mg alloys has been confirmed by X-ray diffraction studies.
Keywords
Al-6.3Zn-2.4Mg alloy; Hydrogen embrittlement; Hydrogen attack; Temper embrittlement;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
연도 인용수 순위
1 G.M. Ugiansky, L.P. Skolnick and S.W. Stiefel. "Directional Effects in the Stress Corrosion Cracking of an Aluminum Alloy", Corrosion, 25 (1969) 77-86.   DOI
2 Tae-hun Kim, Sung-Yong Shim, Hyung-Won Park and Su- Gun Lim, J.KFS, "Optimum Fabrication Conditions and Reheating Characteristic of Semi-Solid Al-Zn-Mg-(Sc) Alloy by Inclined Cooling Plate", 29(5) (2009) 213-219   과학기술학회마을
3 Hyung-Won Park, Dae-hwan Kim, Sung-Yong Shim, Hee- Kyung Kim, Bong-Hak Seong, Chang-Ock Choi and Su-Gun Lim, J.KFS, "The Effect of Ca Addition on the Grain Growth Inhibition During Reheating Process of Al-Zn-Mg Al Alloys for Thixo-extrusion", 31(6) (2011) 347-353   과학기술학회마을   DOI   ScienceOn
4 A.J. Sedriks, J.A.S. Green and D.L. Novak, Met. Trans., "The influence of heat treatment on the stress-corrosion susceptibility of a ternary Al-5.3 Pct Zn-2.5 Pct Mg alloy", 4(8) (1973) 1992-1994.   DOI
5 C.R. Shastry, M. Levy and A. Jeshi, Corrosion Science, "The effect of solution treatment temperature on stress corrosion susceptibility of 7075 aluminium alloy", 25(9) (1981) 673- 688.
6 A.W. Thompson and I.M. Bernstein, Fourth International Conference on Fracture, MCIC /B103816, 2 (1978) 249-254.
7 A.W. Thompson and I.M. Bernstein, Advancesin Corrosion Science and Technology, "The Role of Metallurgical Variables in Hydrogen-Assisted Environmental Fracture", 7 (1980) 53- 175.
8 J. Albrecht, A.W. Thompson and I.M. Bemstein, Metall. Trans. A, "The Role of Microstructure in Hydrogen-Assisted Fracture of 7075 Aluminum", 10A (1979) 1759-1766.
9 D.A. Hardwick, A.W. Thompson and I.M. Bernstein, Metall. Trans. A, "Microstructural effects on hydrogen embrittlement in a high purity 7075 aluminum alloy", 14A (1983) 2517- 2526.
10 D.A. Hardwick, M. Taheri, A.W. Thompson and I.M. Bemstein, Metall. Trans. A, "Hydrogen Embrittlement in a 2000-Series Aluminum Alloy", 13A (1982) 235-239.
11 Hideki HAGI, JSME International Journal, "Hydrogen Embrittlement of Mild Steel Charged Cathodically with Hydrogen_Effect of Dissolved Hydrogen and Hydrogen Damage on Elongation of Mild Steel", 39(2) (1996) 246-251.   DOI   ScienceOn
12 Sung Yong Shim and Su Gun Lim, Journal of The Korean society for heat treatment, "Age Hardening and Mechanical Property of Extruded Al-Zn-Mg-(Cu) Al Alloys with Sc addition", 20(5) (2007) 243-249   과학기술학회마을
13 Hiroshi Suzuki, Daisuke Kobayashi, Nobuko Hanada, Kenichi Takai and Yukito Hagihara, Materials Transactions, "Existing State of Hydrogen in Electrochemically Charged Commercial-Purity Aluminum and Its Effects on Tensile Properties", 52(9) (2011) 1741-1747   DOI   ScienceOn
14 Kaori Miyata and Masaaki Igarashi, Metall. Tran. A, "Effect of Ordering on Susceptibility to Hydrogen Embrittlement of a Ni-Base Superalloy", 23A (1992) 953-961.
15 Symons D.M., Metall. and Mat. Trans., "Hydrogen Embrittlement of Ni-Cr-Fe Alloys", 28A (1997) 655-663
16 Don Gil Kwon, Hak Min Kim, Sung Hak Lee and young Won Chang, J. of the Korean Inst. of Met. & Mater., "Microscopic Mechanism of the Hydrogen Damage Effect on Softening Behavior", 30(10) (1992) 1248-1257.   과학기술학회마을
17 Hagiwara and N. N. Oguchi, Corrosion-National Association of Corrosion Engineers Annual Conference, Nace International, (1997) Paper No. 200
18 D.O. Sprowls and R.H. Brown, Stress Corrosion Mechanisms for Aluminum Alloys, in Proc. of Conf. Fundamental Aspects of Stress Corrosion Cracking, Ohio State University, NACE International (1969) 466.
19 T. Zhang, W.Y. Chu, K.W. Gao and L.J. Qiao, Mater. Sci. Eng. A, "Study of correlation between hydrogen-induced stress and hydrogen embrittlement", 347 (2003) 291-299.   DOI   ScienceOn
20 P. Andrews, M. McQueen and N. Millwood, Corrosion, "Variation of the Fracture Toughness of a High-Strength Pipeline Steel Under Cathodic Protection", 57(8) (2001) 721- 729.   DOI   ScienceOn