摘要
研究Al65Fe10Zr20Gd5混合粉末的机械合金化引起的非晶态化过程,采用X射线衍射仪(XRD)和扫描电镜(SEM)分析混合粉末的结构演变和形貌,用差热分析仪(DTA)分析非晶态合金的热稳定性。结果表明,粉末在机械合金化过程中先细化,由初始粉末直接扩散固溶导致晶格崩溃形成非晶,球磨60h后Al65Fe10Zr20Gd5完全非晶化。DTA曲线显示非晶合金晶化呈现单一的放热峰。合金在923K等温退火1h后,完全晶化,析出复杂的中间相,表现出多晶型晶化的特点,晶化产物为Fe5Gd、Fe2Zr、Al2Gd3和α-(Al)固溶相。Al65Fe10Zr20Gd5非晶晶化激活能为259.64 kJ.mol-1,该非晶合金具有较高的热稳定性和较强的抗晶化能力。
The amorphous Al65Fe10Zr20Gd5 alloy was successfully prepared by mechanical alloying.The microstructure evolution,phase transformation and thermal stability were investigated by X-ray diffraction technique,scanning electron microscopy and differential thermal analysis.The results show that the mixture powders were fully amorphized after milling for 60h.DTA results show that one exothermal peak during the crystallization of amorphous alloy.The production phases of crystallization for amorphous Al65Fe10Zr20Gd5 alloy,annealing at temperature 923K for one hour,composed of α-（Al） solid solution,Fe5Gd,Fe2Zr and Al2Gd3.The crystallization activation energy of the amorphous alloy estimated with the Kissinger equation is 259.64 kJ·mol-1.
出处
《广西科学》
CAS
2010年第1期64-67,共4页
Guangxi Sciences
基金
国家自然科学基金项目(50761002)
广西自然基金(0728025)
广西大学有色金属及材料加工新技术教育部重点实验室开放基金(GXKFJ-03)
广西研究生创新项目(2008105930805M063)资助
