一种提高镁合金零部件抗火焰蔓延性的尺寸设计类判据  

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

作　　者：胡波 韩嘉璇 李德江[1] 李子昕 曾小勤[1] 丁文江[1] 林占宏 金晨 赵寿 Bo HU;Jia-xuan HAN;De-jiang LI;Zi-xin LI;Xiao-qin ZENG;Wen-jiang DING;Zhan-hong LIN;Chen JIN;Shou ZHAO(National Engineering Research Center of Light Alloy Net Forming and the State Key Laboratory of Metal Matrix Composites,School of Materials Science and Engineering,Shanghai Jiao Tong University,Shanghai 200240,China;Qinghai Salt Lake Tri-Magnesium Co.,Ltd.,Xining 810000,China)

机构地区：[1]上海交通大学材料科学与工程学院轻合金精密成型国家工程研究中心&金属基复合材料国家重点实验室,上海200240 [2]青海盐湖特立镁有限公司,西宁810000

出　　处：《Transactions of Nonferrous Metals Society of China》2024年第4期1123-1135,共13页中国有色金属学报（英文版）

基　　金：supported by the National Key Research and Development Program of China(No.2021YFB3501002);the National Science and Technology Major Project of China(No.J2019-Ⅷ-0003-0165);Qinghai Salt Lake Industry Co.,Ltd.financially by the Science and Technology Project,China(No.21-ZC0609-0003)。

摘　　要：基于能量守恒定律提出了一种用于预测棒状镁合金样品火焰蔓延时间的判据,该判据表明火焰蔓延时间主要受合金材料和样品尺寸影响。控制体的初始温度和起燃温度以及样品的S/l_c比值(样品横截面面积/横截面周长)是火焰蔓延时间的决定性因素。火焰蔓延时间正比于ΔH(将单位质量的样品从初始温度加热到起燃温度所需的能量)和S/l_c比值,这在Mg-8.5Al-0.5Zn-0.2Mn、Mg-2.7Nd-0.4Zn-0.6Zr和Mg-4.0Y-3.3Nd-0.5Zr镁合金中得到验证。对于尺寸相同的样品,Mg-8.5Al-0.5Zn-0.2Mn合金样品有着最大的ΔH以及最长的火焰蔓延时间;对于材质、长度和横截面面积相同的样品,圆形横截面样品的S/lc比值最大,其抗火焰蔓延性能也最佳。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/lc 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 theΔH(the energy required to heat a unit mass of sample from initial temperature to ignition temperature)and the S/lc 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/lc ratio and the best flame spread resistance in the same alloy.

关 键 词：镁合金零部件 抗火焰蔓延性 显微组织 尺寸设计 判据 

分 类 号：TG146.22[一般工业技术—材料科学与工程]