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논문 기본 정보

자료유형
학술저널
저자정보
Hyun Ji Kim (Kyungpook National University) Young Min Kim (Korea Institute of Materials Science) Jun Ho Bae (Korea Institute of Materials Science) Jonghun Yoon (Hanyang University) Sung Hyuk Park (Kyungpook National University)
저널정보
대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.29 No.2
발행연도
2023.2
수록면
381 - 389 (9page)
DOI
10.1007/s12540-022-01237-1

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초록· 키워드

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In this study, an Mg–9Al–0.8Zn–0.2Mn–0.3Ca–0.2Y (AZXW9100) alloy having high corrosion and ignition resistancecharacteristics is recently developed. This study investigates the aging hardening and Mg17Al12precipitation characteristicsof the extruded AZXW9100 alloy by comparing those of a commercial AZ91 counterpart. Both alloys’ microstructuresconsist of equiaxed recrystallized grains and they have an intense basal texture. Unlike the AZ91 alloy with a few Al–Mnparticles, the AZXW9100 alloy contains numerous Al2Y,Al8Mn4Y,and Al2Caparticles. As the aging time increases from0 to 8 h at 200 °C, the hardness increases from 63.6 to 95.4 Hv and 68.8 to 98.3 Hv for the AZ91 and AZXW9100 alloys,respectively. Although the hardness increments during aging and the peak aging times are almost the same for both alloys,their Mg17Al12precipitation behavior considerably differs. During aging, the number of Mg17Al12continuous precipitatesformed in the AZXW9100 alloy is less than that in the AZ91 alloy because of the lower amount of Al solute atoms in theformer. The nucleation and growth of Mg17Al12discontinuous precipitates (DPs) are also suppressed in the AZXW9100alloy because of the combined effect by the reduced Al solutes, finer grains, Ca and Y solutes, and second-phase particles.Consequently, the area fraction of DPs of the peak-aged AZXW9100 alloy is nearly half that of the peak-aged AZ91 alloy.This study demonstrates that adding small amounts of Ca and Y to AZ91 alloy causes drastic variations in the Mg17Al12precipitation behavior during aging.

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