Microstructure and surface of 2A12 aluminum alloy cladded with pure aluminum after solution treatment
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Microstructure and surface of 2A12 aluminum alloy cladded with pure aluminum after solution treatment Sen Du* , Yong-An Zhang , Li-Zhen Yan, Xi-Wu Li, Zhi-Hui Li, Bai-Qing Xiong, Hong-Wei Yan, Kai Wen
Received: 12 July 2019 / Revised: 2 September 2019 / Accepted: 1 July 2020 Ó The Nonferrous Metals Society of China and Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract The effects of solution temperature and holding time on the microstructure, mechanical properties and surface morphology of 2A12 aluminum alloy sheets were discussed in this paper. The universal tensile tester was used to test the tensile strength and yield strength of aluminum alloy sheets with different treatment systems. The surface morphology of the alloy sheets was characterized by a white light interference profile scanner, and the microstructure of the sheets was characterized by optical microscope (OM), scanning electron microscope (SEM) and electron backscattered diffraction (EBSD). The results showed that the mechanical properties of the sheets could not satisfy GBT228.1-2010 national standard when the holding time was 10 min and the holding temperature was 475 °C. However, under the other heat treatment systems, the alloy could reach the GBT228.1-2010 national standard. Moreover, with the extension of the holding time, the part of the matrix gradually diffused into the aluminumclad layer. When the holding time was shorter than 25 min, the boundary between the matrix and the aluminum-clad layer was relatively obvious. And the diffusion gradually became obvious when the holding time was over 25 min. Thereby, the boundary became blurry. The further S. Du*, Y.-A. Zhang, L.-Z. Yan, X.-W. Li, H.-W. Yan, K. Wen GRIMAT Engineering Institute Co., LtD., Beijing 101407, China e-mail: [email protected] S. Du, Y.-A. Zhang, L.-Z. Yan, X.-W. Li, Z.-H. Li, B.-Q. Xiong, H.-W. Yan, K. Wen General Research Institute for Nonferrous Metals, Beijing 100088, China Y.-A. Zhang State Key Laboratory of Nonferrous Metals and Processes, GRINM Group Co., LtD., Beijing 100088, China
investigation suggested that the solution temperature of 495 °C and the holding time of 35 min showed better mechanical properties and better surface morphology. Keywords 2A12 aluminum alloy; Surface topography; Aluminum layer; Solution treatment
1 Introduction The 2xxx series aluminum alloy is a type of aluminum alloys with Cu and Mg as main additive elements, and it is well known as the high-strength aluminum alloy [1, 2]. As early as 1960, the 2xxx alloy has become one of the important aluminum alloy materials used in the aerospace industry due to its excellent mechanical properties such as high strength, low density, good welding performance and processing properties [3]. At the beginning of the twentieth century, the Al–8Cu alloy material produced by Alcoa was used by the Wright brothers in the crankcase of their first aircraft. This opened the initial application of aluminum alloy in the aerospace industry. The Al–8Cu alloy was the
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