纳米颗粒增强相控制在不可焊铝合金 7075 的电弧焊接中的应用。

Nanoparticle-enabled phase control for arc welding of unweldable aluminum alloy 7075.

机构信息

Department of Mechanical and Aerospace Engineering, University of California, Los Angeles, CA, 90095, USA.

Department of Materials Science and Engineering, University of California, Los Angeles, CA, 90095, USA.

出版信息

Nat Commun. 2019 Jan 9;10(1):98. doi: 10.1038/s41467-018-07989-y.

DOI:10.1038/s41467-018-07989-y

PMID:30626876

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6327098/

Abstract

Lightweight materials are of paramount importance to reduce energy consumption and emissions in today's society. For materials to qualify for widespread use in lightweight structural assembly, they must be weldable or joinable, which has been a long-standing issue for high strength aluminum alloys, such as 7075 (AA7075) due to their hot crack susceptibility during fusion welding. Here, we show that AA7075 can be safely arc welded without hot cracks by introducing nanoparticle-enabled phase control during welding. Joints welded with an AA7075 filler rod containing TiC nanoparticles not only exhibit fine globular grains and a modified secondary phase, both which intrinsically eliminate the materials hot crack susceptibility, but moreover show exceptional tensile strength in both as-welded and post-weld heat-treated conditions. This rather simple twist to the filler material of a fusion weld could be generally applied to a wide range of hot crack susceptible materials.

摘要

在当今社会，轻量化材料对于降低能源消耗和减少排放至关重要。为了使材料能够广泛应用于轻量结构组件，它们必须可焊接或可连接，这对于高强度铝合金（如 7075 铝合金（AA7075））来说是一个长期存在的问题，因为它们在熔焊过程中存在热裂纹敏感性。在这里，我们通过在焊接过程中引入纳米颗粒增强的相控制，证明了 AA7075 可以安全地进行电弧焊接而不会产生热裂纹。使用含有 TiC 纳米颗粒的 AA7075 填充焊丝进行焊接的接头不仅具有细小的球形晶粒和改良的二次相，这两者都从根本上消除了材料的热裂纹敏感性，而且在焊接和焊后热处理条件下都表现出优异的拉伸强度。这种对熔焊接头填充材料的简单改进可以广泛应用于各种具有热裂纹敏感性的材料。