Al-Cu-Mn 주조합금의 SCC 특성에 미치는 Sn 첨가의 영향

김광년; 김경현; 김인배; Kwang-Nyeon Kim; Kyung-Hyun Kim; In-Bae Kim

Korean Journal of Materials Research, Vol.12, No.6, 436-441, June, 2002

DOI10.3740/MRSK.2002.12.6.436 Export Citation

Al-Cu-Mn 주조합금의 SCC 특성에 미치는 Sn 첨가의 영향

Effect of Sn Addition on the SCC Properties of Al-Cu-Mn Cast Alloy

김광년^†, 김경현¹, 김인배

부산대학교 재료공학과
¹한국기계연구원

Kwang-Nyeon Kim^†, Kyung-Hyun Kim¹, and In-Bae Kim

Dept.of Materials Science Engineeirng, Busan National University, Pusan 609-735, Korea
¹Korea Institute of Machinery and Materials, Changwon 641-010, Korea

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Effect of Sn addition on the stress corrosion cracking(SCC) resistance of the Al-Cu-Mn cast alley was investigated by C-ring teat and electrical conductivity measurement, The electrical conductivity and SCC resistance increased by Sn addition. The alley containing 0,10%Sn showed maximum electrical conductivity and the best SCC resistance. At the same composition, the electrical conductivity and SCC resistance increased from peak aged condition to ever aged condition. The PFZ and coarse precipitates along the grain boundary were observed from TEM micrographs. The fracture mode of the alloy was confirmed as intergranular type and showed brittle fracture surface. The SCC mechanism of the alloy was concluded as the anodic dissolution model, The maximum hardness was increased from 130Hv in the Sn-free alloy to 156Hv in the 0.10%Sn added alloy.

Keywords:Al-Cu-Mn cast allay . Effect of Sn addition . SCC resistance;Electrical conductivity;Intergranular fracture;Anedie dissolution medel;Miero-hardness;PFZ

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Poulose PK, Morral JE, McEvily AJ, Metall. Trans., 5, 1393 (1974)

[1] Wilm A, Metallurgie, 8, 225 (1906)

[2] Joly PA, Mehrabian R, J. Mater. Sci., 11, 1393 (1976)

[3] Flemings MC, Metall. Trans., 27A, 957 (1991)

[4] Polmear IJ, Trans. Mater. Soc. AIME, 230, 1331 (1964)

[5] Kim KH, Lee TH, Park JG, Kim IB, J. Kor. Inst. Met. Mater., 37, 142 (1999)

[6] Lee CH, Kim KH, Kim IB, Korean J. Mater. Res., 11(4), 266 (2001)

[7] Kim KH, Lee BH, Kim IB, Korean J. Mater. Res., 11(4), 300 (2001)

[8] MIL-H-6088G, 'Heat Treatment of Aluminum Alloys', p. 43 (1991) (1991)

[9] SAE AMS 4107A (1986) (1986)

[10] Beddoes JC, Demalherbe MC, Can. Aeronaut. Space. J., 27, 222 (1981)

[11] Islam MU, Wallace W, Met. Tech., 11, 320 (1984)

[12] Choi JW, Kim JK, Kim HG, Lee SL, Kim IB, Korean J. Mater. Res., 9(7), 695 (1999)

[13] Sully AH, Hardy HK, Heal T, J. Inst Met, 76, 269 (1949)

[14] Adler PN, Delasi R, Gecshwind G, Metall. Trans., 3, 3191 (1972)

[15] Kent KG, J. Inst. Met, 15, 171 (1970)

[16] Sanders TH, Jr, Ludwiczak EA, Sawtell RR, Mater. Sci. Eng., 43, 247 (1980)

[17] Nicholson RB, J. Inst. Met, 95, 91 (1967)

[18] De Ardo AJ, Townsend RD, Metall. Trans., 1, 2573 (1970)

[19] Poulose PK, Morral JE, McEvily AJ, Metall. Trans., 5, 1393 (1974)