魏守征,王志英,饶文姬,李志勇,张英乔

• 1:中北大学焊接研究中心
• 2:中北大学能源动力工程学院

摘要(Abstract)：

为实现Ti/Al熔钎焊接头组织性能的优化,采用Al-Mg焊丝进行Ti6Al4V/5A05Al异种金属的熔化极氩弧熔钎焊。采用X射线衍射(XRD)、扫描电镜(SEM)、能谱仪(EDS)等对Ti/Al界面组织结构和接头断口形貌进行了分析,采用万能力学试验机对接头的抗拉强度进行了测试。结果表明,采用Al-Mg焊丝配合合适的焊接工艺可实现钛与铝的可靠焊接,钛与焊缝之间通过形成一层厚度1～5μm的芽状TiAl_3反应层实现良好的钎焊结合;Ti/Al界面附近未发现未焊透、裂纹等微观缺陷。拉伸测试中大多数接头断裂于铝侧焊接热影响区中,接头最高抗拉强度达243 MPa。与Al-Si焊丝相比,采用Al-Mg焊丝时Ti/Al熔钎焊接头的抗拉强度获得了显著提高。

关键词(KeyWords)： 异种金属;熔钎焊;微观组织;力学性能

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51805492);; 中北大学校科学研究基金(110248)

作者(Author): 魏守征,王志英,饶文姬,李志勇,张英乔

DOI: 10.13289/j.issn.1009-6264.2018-0378

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