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Phát triển các hợp kim Mg–Zn–Y–Ca chứa pha quasicrystal icosahedral thông qua việc thêm một lượng nhỏ Y
Tóm tắt
Trong nghiên cứu này, ba hợp kim Mg–Zn–Y–Ca được gia cường bằng pha quasicrystal icosahedral thông qua việc thêm một lượng nhỏ Y đã được ép đùn ở nhiệt độ thấp 503 K. Khi tăng hàm lượng Zn và Y, kích thước hạt của hợp kim sau khi ép đùn đã giảm đáng kể trong khi cả kích thước và thể tích của các kết tủa kích thước nan giảm đều tăng lên. Việc tinh chế hạt trong hợp kim Mg–Zn–Y–Ca có liên quan đến quá trình tái kết tinh động trong quá trình ép đùn và hiệu ứng giữ chặt của các kết tủa kích thước nano trên biên hạt. Sau khi ép đùn, độ bền kéo (YS) và độ bền kéo cực đại (UTS) của ba hợp kim đã tăng lên đáng kể. Độ bền kéo YS đạt 294.0 MPa, UTS đạt 337.5 MPa, và độ kéo dài đạt 10.6% trong trường hợp hợp kim Mg–2.09Zn–0.26Y–0.12Ca (at.%). Sự cải thiện trong các tính chất cơ học chủ yếu có thể do sự gia cường biên hạt và sự gia cường Orowan. Hợp kim khi đúc cho thấy một vết nứt tách biệt điển hình trong khi hợp kim sau khi ép đùn có dạng nứt hỗn hợp của nứt lõm và nứt dọc theo kiểu sinh đôi.
Từ khóa
#hợp kim Mg–Zn–Y–Ca #quasicrystal icosahedral #ép đùn #tái kết tinh động #kết tủa kích thước nano #độ bền kéo #cải thiện tính chất cơ họcTài liệu tham khảo
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