A criterion of dimensional design to improve flame spread resistance of magnesium alloy components

IF 4.7 1区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Transactions of Nonferrous Metals Society of China Pub Date : 2024-04-01 DOI:10.1016/S1003-6326(23)66458-1

Bo HU , Jia-xuan HAN , De-jiang LI , Zi-xin LI , Xiao-qin ZENG , Wen-jiang DING , Zhan-hong LIN , Chen JIN , Shou ZHAO

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Abstract

A criterion for predicting the flame spread time of stick-shaped Mg alloy samples was proposed based on the law of energy conservation. It is indicated that the flame spread time is mainly affected by the material and sample dimension. The initial temperature and ignition temperature of the control volume and the S/l_c ratio (the cross-sectional area/cross-sectional circumference) of the sample are decisive for the flame spread time. The flame spread time is proportional to the ΔH (the energy required to heat a unit mass of sample from initial temperature to ignition temperature) and the S/l_c ratio, which is confirmed in three Mg alloys of Mg–8.5Al–0.5Zn–0.2Mn, Mg–2.7Nd– 0.4Zn–0.6Zr and Mg–4.0Y–3.3Nd–0.5Zr. For samples with the same dimension, the Mg–8.5Al–0.5Zn–0.2Mn alloy sample possesses the largest ΔH and the longest flame spread time. For samples with constant length and cross-sectional area, the sample with circular cross-section has the largest S/l_c ratio and the best flame spread resistance in the same alloy.

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提高镁合金部件抗火焰蔓延性能的尺寸设计标准

根据能量守恒定律，提出了预测棒状镁合金样品火焰蔓延时间的标准。结果表明，火焰蔓延时间主要受材料和样品尺寸的影响。控制体积的初始温度和点火温度以及样品的 S/lc 比（横截面积/横截面周长）对火焰蔓延时间起决定性作用。火焰蔓延时间与 ΔH（将单位质量的样品从初始温度加热到点火温度所需的能量）和 S/lc 比成正比，这在 Mg-8.5Al-0.5Zn-0.2Mn、Mg-2.7Nd-0.4Zn-0.6Zr 和 Mg-4.0Y-3.3Nd-0.5Zr 三种镁合金中得到了证实。在相同尺寸的样品中，Mg-8.5Al-0.5Zn-0.2Mn 合金样品的ΔH 最大，火焰蔓延时间最长。在长度和横截面积不变的样品中，圆形横截面的样品具有最大的 S/lc 比，在同种合金中具有最好的抗火焰蔓延性能。

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来源期刊

Transactions of Nonferrous Metals Society of China 工程技术-冶金工程

CiteScore

7.40

自引率

17.80%

发文量

8456

审稿时长

3.6 months

期刊介绍： The Transactions of Nonferrous Metals Society of China (Trans. Nonferrous Met. Soc. China), founded in 1991 and sponsored by The Nonferrous Metals Society of China, is published monthly now and mainly contains reports of original research which reflect the new progresses in the field of nonferrous metals science and technology, including mineral processing, extraction metallurgy, metallic materials and heat treatments, metal working, physical metallurgy, powder metallurgy, with the emphasis on fundamental science. It is the unique preeminent publication in English for scientists, engineers, under/post-graduates on the field of nonferrous metals industry. This journal is covered by many famous abstract/index systems and databases such as SCI Expanded, Ei Compendex Plus, INSPEC, CA, METADEX, AJ and JICST.