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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2024.7
- 수록면
- 2,038 - 2,043 (6page)
- DOI
- 10.1007/s12540-023-01612-6
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초록· 키워드
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This study investigates the influence of calcium (Ca) on grain boundary migration in pure magnesium (Mg) during annealing.Pure Mg and Mg-0.5Ca alloy samples undergo compression and subsequent annealing at various temperatures to revealthat the presence of Ca impedes grain growth through solute drag effects and Zenner pinning induced by Mg2Caparticles.The segregation of Ca solute atoms at grain boundaries imposes solute drag, reducing boundary mobility, while Mg2Caintermetallic particles also act as barrier to grain boundary migration. The research demonstrates weakened basal texture andsmaller grain size in Mg-0.5Ca, attributed to particle-stimulated nucleation (PSN). Twin boundaries (TBs) also influencegrain growth kinetics, with dislocation effects limiting grain coarsening at lower annealing temperatures. As annealingtemperature increases, dislocation annihilation occurs, enabling freer grain boundary migration. Vickers hardness test wasemployed which revealed increased hardness in Mg-0.5Ca alloy because of stress accumulations arising from obstacleshindering the movement of dislocations, which are generated by solute elements and second-phase particles. Conversely, thereduction in hardness values as annealing temperature rises in both materials indicates a heightened dislocation annihilationprocess due to static recovery occurring at elevated temperatures.
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