钛铝合金板材压印成形及接头力学性能实验研究

发布时间：2018-07-04 08:42

本文选题：压印连接 + 钛合金　；参考：《材料导报》2015年14期

【摘要】：对钛合金(TA1)和铝合金(Al5052)板材组合进行压印连接的可行性进行了研究,发现压印连接可以有效地实现TA1-TA1组合和Al5052-TA1组合的连接。对所获得的接头进行准静态力学性能测试,并运用扫描电子显微镜对接头拉伸断口进行微观分析。结果表明,压印连接时,钛合金和铝合金的组合能够获得成形性较好的压印接头,TA1-TA1接头的最大载荷和失效位移较Al5052-TA1接头提高了303.8%和49.4%,这两种接头静态失效形式相似,为上板颈部材料首先被破坏,产生裂纹,之后裂纹沿周向逐渐扩展,最终导致整个压印接头断裂。由微观断口可以判断TAl-TA1接头断口处呈现准解理和韧窝形貌,即同时具有韧性断裂和脆性断裂的特征;Al5052-TA1接头断口处呈现直径和深度较大的拉长韧窝,即为韧性断裂。
[Abstract]:The feasibility of imprint bonding of titanium alloy (TA1) and aluminum alloy (Al5052) sheet was studied. It was found that the joint of TA1-TA1 and Al5052-TA1 could be realized effectively. The quasi-static mechanical properties of the joints were tested and the tensile fracture of the joints was analyzed by scanning electron microscope (SEM). The results show that the combination of titanium alloy and aluminum alloy can obtain the maximum load and failure displacement of the ta-TA1 joint with good formability, which is 303.8% and 49.4% higher than that of the Al5052-TA1 joint. The static failure forms of the two joints are similar. It is found that the upper plate neck material is first destroyed and cracks are produced, and then the cracks propagate gradually along the circumference, resulting in the fracture of the whole imprint joint. The fracture surface of TAl-TA1 joints shows quasi-cleavage and dimple morphology from the microfracture, that is, the tensile dimples with larger diameters and depths at the fracture surfaces of Al-5052-TA1 joints are characterized by both ductile and brittle fracture, that is, ductile fracture.
【作者单位】：昆明理工大学机电工程学院;
【基金】：国家自然科学基金(50965009) 昆明理工大学分析测试基金(20140974)
【分类号】：TG306;TG49

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