In-situ study of precipitates in Al-Zn-Mg-Cu alloys using anomalous small-angle x-ray scattering

doi:10.1088/1674-1056/25/6/066101

Abstract

In the present work, the precipitate compositions and precipitate amounts of these elements (including the size distribution, volume fraction, and inter-precipitate distance) on the Cu-containing 7000 series aluminum alloys (7150 and 7085 Al alloys), are investigated by anomalous small-angle x-ray scattering (ASAXS) at various energies. The scattering intensity of 7150 alloy with T6 aging treatment decreases as the incident x-ray energy approaches the Zn absorption edge from the lower energy side, while scattering intensity does not show a noticeable energy dependence near the Cu absorption edge. Similar results are observed in the 7085 alloy in an aging process (120℃) by employing in-situ ASAXS measurements, indicating that the precipitate compositions should include Zn element and should not be strongly related to Cu element at the early stage after 10 min. In the aging process, the precipitate particles with an initial average size of ～8Å increase with aging time at an energy of 9.60 keV, while the increase with a slower rate is observed at an energy of 9.65 keV as near the Zn absorption edge.

Keywords: anomalous small-angle x-ray scattering alloy precipitates

Received: 27 November 2015
Revised: 26 February 2016
Accepted manuscript online:

PACS:	61.05.cf	(X-ray scattering (including small-angle scattering))
	61.66.Dk	(Alloys )

Fund:

Project supported by the National Natural Science Foundation of China (Grant Nos. 11005143, 11405259, and 51274046) and the Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry of China (Grant No. [2014]1685).

Corresponding Authors: Feng-Gang Bian
E-mail: bianfenggang@sinap.ac.cn

Cite this article:

Chun-Ming Yang(杨春明), Feng-Gang Bian(边风刚), Bai-Qing Xiong(熊柏青), Dong-Mei Liu(刘冬梅), Yi-Wen Li(李怡雯), Wen-Qiang Hua(滑文强), Jie Wang(王劼) In-situ study of precipitates in Al-Zn-Mg-Cu alloys using anomalous small-angle x-ray scattering 2016 Chin. Phys. B 25 066101

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In-situ study of precipitates in Al-Zn-Mg-Cu alloys using anomalous small-angle x-ray scattering

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