Effect of Addition of Rare Earth Elements on the Microstructure, Texture, and Mechanical Properties of Extruded ZK60 Alloy

S. Najafi; M. Sabbaghian; A. Sheikhani; P. Nagy; K. Fekete; J. Gubicza

doi:10.1007/s12540-022-01341-2

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자료유형: 학술저널

저자정보: S. Najafi (University of Tehran) M. Sabbaghian (University of Tehran) A. Sheikhani (University of Tehran) P. Nagy (Eötvös Loránd University) K. Fekete (Charles University) J. Gubicza (Eötvös Loránd University)

저널정보: 대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.29 No.6

발행연도: 2023.6

수록면: 1,699 - 1,711 (13page)

DOI: 10.1007/s12540-022-01341-2

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Microstructure, texture and mechanical properties of extruded ZK60 alloys containing different rare earth (RE) elementswere studied. Two alloys containing 1 and 2 wt% Ce-rich lanthanides as well as two other alloys with 1 and 2 wt% Y wereprepared and denoted as ZK60–1RE, ZK60–2RE, ZK60–1Y and ZK60–2Y, respectively. The results showed that the additionof RE elements refined the grain size of the ZK60 alloy, and Y had a more significant effect on the grain size reduction.The finer grain size in the ZK60–1Y and ZK60–2Y alloys (2.3 and 2.1 μm, respectively) compared to ZK60–1RE andZK60–2RE alloys (6.2 and 3.7 μm, respectively) was attributed to the pinning effect of very fine secondary phases on grainboundaries. While the ZK60–1Y alloy exhibited a fiber texture with a slight rotation of < 1010 > poles around the extrusiondirection, the ZK60–1RE alloy showed a new texture component known as RE texture. Moreover, there were no changes inthe fiber-like texture component of ZK60–2RE and ZK60–2Y alloys. The mechanical properties of the alloys were assessedby shear punch test. Accordingly, the addition of RE and Y elements enhanced the shear strength, and the maximum ultimateshear strength of 176 MPa was obtained for the ZK60–2RE alloy. The higher dislocation density, the lower volume fractionof dynamically recrystallized regions compared to other alloys, and the large fraction of secondary phase particles wereresponsible for this high strength value.

#ZK60 Mg alloy · Dislocation density · Extrusion · Shear mechanical properties · Rare earth elements · Texture

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