充氢Al-6.3Zn-2.4Mg合金力学特性研究

Dae-hwan Kim, Tae-young Choi, Sung-Young Shim, Su-gun Lim
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引用次数: 0

摘要

本研究选取对氢环境敏感的7000系铝合金中挤压的Al-6.3Zn-2.4Mg合金,考察时效条件和充氢时间对合金力学性能的影响。分别在(UA)、(峰值时效(PA)和(超时效(OA))下时效24h。在恒电位条件下(-2000 mV vs (Ag/AgCl)),在1M和0.1%溶液中进行12、24和36小时的充电试验。采用扫描电镜(SEM)对断口表面进行了观察。对Al-6.3Zn-2.4Mg合金挤压充氢前后峰时效试样的x射线衍射(XRD)图进行了分析。x射线衍射研究证实了充氢Al-6.3Zn-2.4Mg合金的抗拉强度和伸长率的递减规律,并以过时效的先后顺序表示。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A Study on Mechanical Characteristic of Hydrogen Charged Al-6.3Zn-2.4Mg Alloy
In this study, the extruded Al-6.3Zn-2.4Mg alloys were selected among the 7000 series aluminum alloys sensitive to hydrogen environment in order to examine the effects of both the aging conditions and the length of hydrogen charging period on the mechanical properties of the alloy. The specimens were aged for 24hours at (under aging (UA)), (peak aging (PA)), and (over aging (OA)), respectively. Charging tests were performed at RT for 12, 24, 36 hours under potentiostatic conditions (-2000 mV vs (Ag/AgCl)) for 12, 24 and 36 hours in 1M and 0.1% solution. The fracture surface was examined by scanning electron microscopy (SEM). X-ray diffraction (XRD) pattern in peak aged sample was obtained before and after hydrogen charging from extruded Al-6.3Zn-2.4Mg alloys. The decreasing rate of tensile strength and elongation is represented in order of over aging in hydrogen charged Al-6.3Zn-2.4Mg alloys has been confirmed by X-ray diffraction studies.
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