Effect of annealing on the interface microstructure and mechanical properties of a STS-Al-Mg 3-ply clad sheet
Effect of annealing on the interface microstructure and mechanical properties of a STS-Al-Mg 3-ply clad sheet
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DOI：
10.1016/j.msea.2012.06.094
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发表时间：
2012-10-30
期刊：
影响因子：
6.4
通讯作者：
Lee, Young-Seon
中科院分区：
文献类型：
--
作者：
Lee, Kwang Seok;Yoon, Dong Hyun;Lee, Young-Seon
在这项研究中，我们研究了轧制后热处理对铁素体不锈钢（STS 430）-铝（Al 3004）-镁（AZ 31）3层复合金属的界面组织演变和随后的单轴拉伸性能的影响。通过利用光学，扫描电子显微镜和透射电子显微镜，生成和生长的中间层组成的γ（Mg 17 Al 12）和β（Mg 2 Al 3）相之间的Mg/Al的组成层之间的总厚度为4.56和11.21 μ m，在300 ℃退火1和3小时，分别验证。虽然轧制复合金属在一定程度上通过界面处的机械锁定连接，但通过在300 ℃下退火1 h在AZ 31和Al 3004之间退火诱导产生薄扩散层导致单轴拉伸性能在伸长率方面的增强。然而，进一步退火3 h导致削弱的界面结合性能，由于显着的脆性金属间化合物相的产生。通过对台阶式非原位拉伸试样侧面的观察，证实了沿拉伸轴向沿着方向延缓界面分层的机理。(c)2012 Elsevier B. V.保留所有权利。
In this study we investigated the influence of post-rolling heat treatment upon the microstructure evolution at interface and subsequent uniaxial tensile properties of roll-bonded ferritic stainless steel (STS430)-aluminum (Al3004)-magnesium (AZ31) 3-ply clad metal. By utilizing optical, scanning electron and transmission electron microscopes, the generation and growth of interlayer consists of gamma (Mg17Al12) and beta (Mg2Al3) phases was verified between the constituent layers in the Mg/Al with total thicknesses of 4.56 and 11.21 mu m during annealing at 300 degrees C for 1 and 3 h, respectively. Although as-rolled clad metal was somewhat joined by mechanical locking at the interface, annealing-induced generation of thin diffusion layer between AZ31 and Al3004 by annealing at 300 degrees C for 1 h resulted in the enhancement of uniaxial tensile properties in terms of elongation. However, further annealing for 3 h lead to weakening the interface bonding properties due to the significant generation of brittle intermetallic phases. The mechanism for retarding interface delamination along the direction of tensile axis was confirmed by the observation from the side surfaces of ex-situ stepped tensile-test specimens. (c) 2012 Elsevier B.V. All rights reserved.