【作者】 张中藩； 李国强； 李焕喜； 郑立静；

【Author】 ZHANG Zhongfan LI Guoqiang LI Huanxi ZHENG Lijing (School of Materials Science and Engineering,Beijing University of Aeronautics and Astronautics,Beijing 100083)

【机构】 北京航空航天大学材料科学与工程学院；

【摘要】 Mg₆₅Cu₂₅Gd₁₀非晶合金的热稳定性关系到其作为结构材料的实用性及发展前景。利用差示扫描量热法 （DSC）研究了预先弛豫退火处理后 Mg₆₅Cu₂₅Gd₁₀非晶的特征转变温度和晶化激活能变化,分析了弛豫退火对其热稳定性的影响。通过 kissinger 方程计算其晶化激活能、频率因子、反应速率系数进一步说明此非晶的晶化过程,并通过 X 射线衍射分析退火非晶的析晶过程,结果表明低温弛豫提高了非晶的热稳定性。更多还原

【Abstract】 Thermal stability of Mg₆₅Cu₂₅Gd₁₀ alloy has critical effects on its practical application and develop- ment as a structural material.In this article,we utilize differential scanning calorimetry（DSC）to obtain the character istic temperature of relaxed and annealed Mg₆₅ Cu₂₅ Gd₁₀ glass.Moreover,the activation energy of crystallization and frequency efficient are also calculated by Kissinger means and the thermal stability is understood.X-ray diffraction （XRD）is used to test the amorphous phase and crystallization after annealing.Then,the apparent activation energy of glass transition and crystallization are by Kissinger.The results show that low temperature relaxation has improved the amorphous thermal stability to some extent.更多还原