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Biến đổi cấu trúc do biến dạng dẫn đến tính dẻo nén của các hợp kim thủy tinh Zr65Al7.5Ni10Cu12.5M5 (M = Nb, Pd)
Tóm tắt
Thủy tinh Zr65Al7.5Ni10Cu12.5Nb5 đã được phát hiện có khả năng biến dạng nén dẻo lớn trên 10%, và thuộc tính này được cho là do sự tinh thể hóa nano do biến dạng gây ra. Tuy nhiên, quan sát bằng kính hiển vi điện tử truyền qua chỉ cho thấy các cụm có trật tự mờ nhạt với kích thước khoảng ˜2 nm trên bề mặt gãy của mẫu đã biến dạng, thay vì các tinh thể được xác định rõ như đã được báo cáo trước đó đối với hệ Zr–Al–Ni–Cu–Pd. Hiện tượng này được cho là có liên quan đến độ nhớt cao hơn của chất lỏng siêu lạnh và sự phát triển hạt chậm hơn của pha icosahedral trong quá trình kết tinh sơ cấp ở Zr65Al7.5Ni10Cu12.5Nb5 so với các hợp kim Zr65Al7.5Ni10Cu12.5Pd5. Vai trò của các cụm nano do biến dạng gây ra đối với tính dẻo nén được thảo luận.
Từ khóa
Tài liệu tham khảo
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