Đặc điểm giao diện, cấu trúc vi mô và tính chất cơ học của mối hàn chồng trượt ma sát giữa các hợp kim nhôm/magiê khác nhau: ảnh hưởng của hình dạng đầu chốt

Ping Yang1, Yuqing Mao1, Yang Xu1, Ning Li1, Liming Ke1, Yu Chen1
1National Defence Key Discipline Laboratory of Light Alloy Processing Science and Technology, Nanchang HangKong University, Nanchang, China

Tóm tắt

Ba hình dạng đầu chốt khác nhau gồm hình trụ (C-tool), hình vuông (S-tool) và hình tam giác (T-tool) đã được thiết kế một cách sáng tạo, và ảnh hưởng của hình dạng đầu chốt đến cấu trúc vi mô giao diện và tính chất cơ học của các mối hàn chồng trượt ma sát (FSLW) đã được nghiên cứu. Các kết quả cho thấy rằng các đặc tính giao diện của các mối hàn FSLW được chế tạo bằng các hình dạng đầu chốt khác nhau có sự khác biệt rõ rệt. Sự di chuyển lên trên của hợp kim Mg tại giao diện của mối hàn S-tool và T-tool giảm đáng kể. Hơn nữa, hai lớp hợp chất liên kim loại (IMC) (Al3Mg2 và Al12Mg17) với độ dày khoảng 4,6 μm được hình thành ở đáy giao diện do C-tool. Tuy nhiên, chỉ có một lớp IMC liên tục và cấu trúc eutectic (Mg + Al12Mg17) được tạo ra ở phía nhôm của giao diện do S-tool, và giao diện của T-tool được cấu tạo bởi một lớp IMC không liên tục và cấu trúc eutectic. Tải trọng kéo-shear tối đa của các mối hàn được hàn bằng S-tool đạt được, đạt 5,95 KN. Vị trí gãy xảy ra dọc theo lớp cấu trúc eutectic ở phía nhôm.

Từ khóa

#hàn chồng trượt ma sát #mối hàn không đồng nhất #hợp kim Al/Mg #tính chất cơ học #cấu trúc vi mô #hình dạng đầu chốt

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