Nội dung được dịch bởi AI, chỉ mang tính chất tham khảo
Sự tiến triển của tính dẻo của một hợp kim nhôm-magiê dưới các thay đổi đột ngột của đường đi ứng suất
Tóm tắt
Trong quá trình hình thành và chế tạo vật liệu kỹ thuật, hành vi dẻo có thể tiến triển đáng kể do lịch sử biến dạng phức tạp. Do đó, nghiên cứu này nhằm mô tả sự tiến triển về tính dẻo của một hợp kim nhôm-magiê dưới tải trọng đơn giản đơn điệu và không đơn điệu với những thay đổi đột ngột của đường đi ứng suất. Thay vì chỉ tập trung vào một trạng thái ứng suất đơn lẻ trong quá trình tải trọng bước đầu như hầu hết các nghiên cứu trong tài liệu, chương trình thử nghiệm đường đi biến dạng không đơn điệu hiện tại điều tra ba trạng thái ứng suất – kéo trục đơn, kế hoạch biến dạng và kéo hai trục – trong quá trình tải trọng bước đầu và kết hợp chúng với một tải trọng kéo trục đơn ở bước thứ hai theo hướng ban đầu và vuông góc với hướng tải đầu tiên. Sự kết hợp này tạo ra dữ liệu ứng suất-biến dạng không đơn điệu trong một phổ khá lớn và phân tán theo tham số Schmitt. Kết quả cho thấy rằng hợp kim nhôm-magiê cho thấy một hiện tượng độc đáo với độ bền dưới kéo thấp hơn khi tải lại so với các trường hợp đơn điệu đi kèm với sự gia tăng ổn định của ứng suất vượt qua giá trị đơn điệu ở các biến dạng lớn. Sự gia tăng ứng suất cũng như tỷ lệ cứng lên diễn ra cho đến khi biến dạng đồng nhất và do đó được cho là cứng lên vĩnh viễn. Hành vi không đơn điệu toàn diện được cung cấp bởi chương trình thí nghiệm mới trong nghiên cứu này có thể hỗ trợ thêm cho sự phát triển của các mô hình vật liệu và hiểu biết sâu sắc về các cơ chế cơ bản.
Từ khóa
#hợp kim nhôm-magiê #hành vi dẻo #quá trình biến dạng #ứng suất-biến dạng #cơ chế vật liệuTài liệu tham khảo
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