东北大学学报（自然科学版）

东北大学学报:自然科学版 ›› 2019, Vol. 40 ›› Issue (9): 1263-1267.DOI: 10.12068/j.issn.1005-3026.2019.09.009

• 材料与冶金 • 上一篇    下一篇

Al含量对AZ系镁合金燃点的影响

程春龙， 乐启炽   

  1. (东北大学 材料电磁过程研究教育部重点实验室， 辽宁 沈阳110819)
  • 收稿日期:2018-08-23 修回日期:2018-08-23 出版日期:2019-09-15 发布日期:2019-09-17
  • 通讯作者: 程春龙
  • 作者简介:程春龙(1993-)，男，河南商丘人，东北大学博士研究生；乐启炽(1968-)，男，福建大田人，东北大学教授，博士生导师.
  • 基金资助:
    国家重点研发计划项目(2016YFB0301104)；国家自然科学基金资助项目(51771043).

Effect of Al Content on Ignition Temperature of AZ Series Mg Alloys

CHENG Chun-long， LE Qi-chi   

  1. Key Laboratory of Electromagnetic Processing of Materials， Ministry of Education， Northeastern University， Shenyang 110819， China.
  • Received:2018-08-23 Revised:2018-08-23 Online:2019-09-15 Published:2019-09-17
  • Contact: LE Qi-chi
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摘要： 为了考察AZ系镁合金中不同Al含量对其初始熔化温度、燃点以及热解起燃时所处状态的影响，对镁合金初始熔化温度及燃点进行测试， 采用FESEM扫描电镜对实验镁合金组织及燃烧前合金表面形貌进行观察，采用XRD对合金进行物相分析.结果表明，AZ系镁合金中Al含量较低时对燃点的影响表现为，随Al含量的增加低温熔点相β-Mg17Al12生成并逐渐增多，引起合金初始熔化温度的下降，降低了合金的燃点.同时，纯Mg及AZ31镁合金是在固态下起燃的;AZ61和AZ80镁合金是在半固态下起燃的，但AZ80的固相率更低.此外，Al含量的增加有利于合金起燃前表面膜的连续性与完整性，减缓合金燃点降低.

关键词: 燃点, AZ系镁合金, 热解, 初始熔化温度, SEM(扫描电子显微镜)

Abstract: In this study， the effect of Al content on the onset melting temperature， ignition temperature and pyrolysis ignition state in AZ series Mg alloys were investigated. The onset melting and ignition temperatures of different AZ series Mg alloys were measured. The microstructure and surface morphology of the alloys before combustion were observed by field emission scanning electron microscopy(FESEM)， and X-ray diffraction(XRD)was used for the phase identification. The results show that with Al addition， the β-Mg17Al12 phase with a low melting temperature appears and increases， which can decrease the onset melting and ignition temperatures of the Mg alloys. Moreover， pure Mg and AZ31 are ignited in solid state， while AZ61 can be ignited in semi-solid state and the AZ80 can also be ignited in semi-solid state with less solid fraction. Meanwhile， the increase of Al content can make the oxide layers generated by heating more continuous and perfect， which delays decreasing of ignition temperature.

Key words: ignition temperature, AZ series Mg alloys, pyrolysis, onset melting temperature, SEM(scanning electron microscopy)

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