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Korean Journal of Metals and Materials > Volume 55(8); 2017 > Article
Korean Journal of Metals and Materials 2017;55(8): 529-536. doi: https://doi.org/10.3365/KJMM.2017.55.8.529
Cu가 첨가된 Zn-Al 합금에서 일방향응고 및 냉간인발에 따른 기계적 특성 향상
정해창1, 김민수1,2, 안지혁2, 임성환3, 한승전2, 이재현1, 김광호4
1창원대학교 신금속재료공학과
2재료연구소 소재실용화 연구실
3강원대학교 나노응용공학과
4부산대학교 재료공학과
Enhanced Mechanical Properties by Directional Solidification and Cold Drawing in Cu Added Zn-Al Alloys
Hae Chang Jeong1, Min Soo Kim1,2, Jee Hyuk Ahn2, Sung Hwan Lim3, Seung Zeon Han2, Jehyun Lee1, Kwang Ho Kim4
1Department of Materials Science and Engineering, Changwon National University, Changwon 51140, Republic of Korea
2Commercialization Research Division, Korea Institute of Materials Science, Changwon 51508, Republic of Korea
3Department of Nano Applied Engineering, Kangwon National University, Chuncheon 24341, Republic of Korea
4School of Materials Science and Engineering, Pusan National University, Pusan 46241, Republic of Korea
Correspondence  Seung Zeon Han ,Tel: +82-55-280-3331, Email: szhan@kims.re.kr
Jehyun Lee ,Tel: +82-55-213-3695, Email: ljh@changwon.ac.kr
Received: 10 January 2017;  Accepted: 27 March 2017.  Published online: 1 August 2017.
ABSTRACT
The lamellar structure of two phases, the Zn-rich and Al-rich phases, is formed in a Zn-5 wt% Al eutectic alloy. In order to study the effect of microstructural changes on the tensile properties of eutectic Zn-Al binary alloy, Zn-Al and Zn-Al-Cu alloys were directionally solidified at a growth rate of 50 μm/s using a Bridgman-type method. The alloys were successively drawn until reaching area reductions of 50% and 80% at room temperature. The tensile strength of the Zn-Al alloy decreased with increasing drawing ratio. In the Zn-Al-Cu alloy, the tensile strength increased until the area reduction reached 50%, but decreased at an area reduction of 80%. The ductility of alloys prepared by directional solidification increased with increasing drawing ratio. The orientations of the lamellar structure and grains were aligned in the drawn direction. The inter-lamellar distance of the alloys also decreased with increasing drawing ratio. As a result, the trade-off between strength and ductility could be significantly reduced. The strength and ductility combination of 246 MPa-40% was achieved by cold drawing with 80% area reduction of the Zn-Al-Cu alloy.
Keywords: eutectic, Zn-Al alloy, directional solidification, high strength, high ductility
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