Mg-Nd-Y-Zr-Zn 주조합금의 인장특성에 미치는 시효처리의 영향

김현식; 예대희; 강민철; 김인배; Hyun Sik Kim; Dea Hee Ye; Min Cheol Kang; In Bea Kim

Korean Journal of Materials Research, Vol.18, No.5, 266-271, May, 2008

DOI10.3740/MRSK.2008.18.5.266 Export Citation

Mg-Nd-Y-Zr-Zn 주조합금의 인장특성에 미치는 시효처리의 영향

Effect of Aging Treatment on the Tensile Properties of Mg-Nd-Y-Zr-Zn Casting Alloys

김현식, 예대희¹, 강민철¹, 김인배^†

부산대학교 재료공학부
¹한국마그네슘기술연구조합

Hyun Sik Kim, Dea Hee Ye¹, Min Cheol Kang¹, and In Bea Kim^†

School of material Science and Engineering, Pusan National University, Busan 609-735, Korea
¹Korea Magnesium Technology Research Association, Changwon 641-831, Korea

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Magnesium alloys are alloyed with rare earth elements (Re, Ca, Sr) due to the limited use of magnesium in high-temperature conditions. In this study, the influences of Zr and Zn on the aging behavior of a Mg-Nd-Y alloy were investigated. magnesium alloys containing R.E elements require aging treatments Specifically, Nd, Y and Zr are commonly used for high-temperature magnesium alloys. Various aging treatments were conducted at temperatures of 200, 250 and 300oC for 0.5, 1, 3, 6, and 10 hours in order to examine the microstructural changes and mechanical properties at a high temperature (150oC). Hardness and high-temperature (150oC) tensile tests were carried out under various aging conditions in order to investigate the effects of an aging treatment on the mechanical properties of a Mg-3.05Nd-2.06Y-1.13Zr-0.34Zn alloy. The maximum hardness was 67Hv; this was achieved after aging at 250oC for 3 hours. The maximum tensile, yield strength and elongation at 150oC were 237MPa, 145MPa and 13.6%, respectively, at 250oC for 3 hours. The strengths of the Mg-3.05Nd-2.06Y-1.13Zr-0.34Zn alloy increased as the aging time increased to 3 hours at 250oC This is attributed to the precipitation of a Nd-rich phase, a Zr-rich phase and Mg3Y2Zn3.

Keywords:high-temperature tensile property;rare earth element;Mg-Nd-Y-Zr-Zn alloy;aging treatment

[References]

Ghali E, Proc. First Nagaoka International Workshop on Magnesium Platform Science and Technology, Ed. by Kogima Y, Aizawa T, Kamado S, Nagaoka, p. 261(2000). (2000)
Ruden TJ, Albright DL, Adv. Mater. Proc., 6, 28 (1994)
Finkel A, Regev M, Aghion E, Bamberger M, Rosen A, Eliezer D(Eds), First Israeli Conference on Magnesiom Science and Technology, Magnesium Research Institute, Beer-sheva, Israel, p.121 (1997). (1997)
Celotto S, Acta Mater., 48, 1775 (2000)
Polmear IJ, Light Alloys, 2nd ed., Edward Arnold, p.170 (1989). (1989)
Meschter PJ, O'Neal JE, Met. Trans., 15A, 237 (1984)
Aune TK, Westengen H, SAE Technical paper No.930418.
Sato F, Asakawa Y, J. of Light Metals, 44(2), 104 (1994)
Ahmed M, Ph.D. Thesis, Manchester Univ. (1993). (1993)
Joshi A, Adamson RD, Lewis RE, Magnesium alloys and their apllications, DGM Conf, 495 (1992). (1992)
Zhu SM, Nie JF, Scripta Mater., 50, 51 (2004)
Wu A, Xia C, Material and Design (2006). (2006)
Nie JF, Muddle BC, Scripta Mater., 40(10), 1089 (1999)
Hamu GB, Eliezer D, Shin KS, Cohen S, J. alloys. Comp., 431, 269 (2007)
Li Q, Wang Q, Wang Y, Zeng X, J.alloys. Comp., 427, 115 (2007)

[1] Ghali E, Proc. First Nagaoka International Workshop on Magnesium Platform Science and Technology, Ed. by Kogima Y, Aizawa T, Kamado S, Nagaoka, p. 261(2000). (2000)

[2] Ruden TJ, Albright DL, Adv. Mater. Proc., 6, 28 (1994)

[3] Finkel A, Regev M, Aghion E, Bamberger M, Rosen A, Eliezer D(Eds), First Israeli Conference on Magnesiom Science and Technology, Magnesium Research Institute, Beer-sheva, Israel, p.121 (1997). (1997)

[4] Celotto S, Acta Mater., 48, 1775 (2000)

[5] Polmear IJ, Light Alloys, 2nd ed., Edward Arnold, p.170 (1989). (1989)

[6] Meschter PJ, O'Neal JE, Met. Trans., 15A, 237 (1984)

[7] Aune TK, Westengen H, SAE Technical paper No.930418.

[8] Sato F, Asakawa Y, J. of Light Metals, 44(2), 104 (1994)

[9] Ahmed M, Ph.D. Thesis, Manchester Univ. (1993). (1993)

[10] Joshi A, Adamson RD, Lewis RE, Magnesium alloys and their apllications, DGM Conf, 495 (1992). (1992)

[11] Zhu SM, Nie JF, Scripta Mater., 50, 51 (2004)

[12] Wu A, Xia C, Material and Design (2006). (2006)

[13] Nie JF, Muddle BC, Scripta Mater., 40(10), 1089 (1999)

[14] Hamu GB, Eliezer D, Shin KS, Cohen S, J. alloys. Comp., 431, 269 (2007)

[15] Li Q, Wang Q, Wang Y, Zeng X, J.alloys. Comp., 427, 115 (2007)