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Geeble-1500 test machine. The apparent activate energy was calculated according to exponential function, and the apparent activate energy map was established. The processing map was obtained according... by analyzing the apparent activate energy map, processing map and four criteria of m, , S and systematically. A more accurate range of the conditions for instable deformation can be determined......
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increases with the crystallization temperature, in the range of 40%-50%, which is close to the calculated ones of standard samples with spodumene quartz ratio of 40%-70%. The activation energy... silicates; crystallinity; crystallization mechanisms; activation energy
; activation energy
非晶合金因其独特的微观结构和一系列优异的性能而受到众多材料学者和物理学家的重视[1-3].在众多已经...-isothermal crystallization process and activation energy for crystal growth in amorphous materials[J]. Journal of Materials Science, 1984, 19: 291-296.
[16] POLK, D E, CALKA A, GIESSEN B C. The preparation......Ni59Zr16Ti13Si3Sn2Nb7非晶合金的晶化动力学
来源： 《中国有色金属学报2008年第4期》——代江波 李金山 寇宏超 常辉 胡锐 薛祥义
solution can accelerate recrystallization by the mechanism of particle stimulated nucleation(PSN). The apparent activation energy of two alloys at 375-525℃ are 191 and 212 kJ/mol, respectively. Key words: Mg-Gd-Y-Nd-Ce-Zr alloy; hot-compression; activation energy; recrystallization; particle stimulated nucleation 镁合金是现有的最轻结构材料,具有密度低,比强度和比刚度高等优良特性,在结构件的应用中有很大的潜力[1].但镁合金是密排六方金属,滑移系数目少,塑性变形能力差.细化晶粒可以有效地改善镁......
the energy of grain boundary diffusion. The addition of Sc and Zr decreases activation energy and improves the superplastic property of Al-Mg-Mn alloy. The addition of Sc and Zr refines the grain... motion and dynamic recrystallization harmonize the grain boundary sliding during deformation. Key words: Sc; Zr; Al-Mg-Mn alloy; superplasticity; grain boundary sliding; activation energy ......
between apparent activation energy and temperature at different strain rates 从位错网中解脱,也难以通过交滑移和攀移而与异号位错抵消态.再结晶的形成和长大需要消耗大量的位错,随着变形温度的升高,动态再结晶更加强烈,位错大量减少,应力集中得到松弛,从而潜在位错源数量减少并且启动也更加困难,这将导致变形激活能增 ... activation energy; constitutive relationship 镁合金是迄今在工程应用中密度最低的一类金属结构材料[1-4],大量的镁合金产品主要是采用铸造的方式获得,但是,通过轧制,挤压,锻造等压力加工工艺生产的变形镁合金产品,具有比铸造镁合金更高的强度和更好的延展性,可以满足更多结构件的需求,变形镁合金具有许多优异性能[5-6].由于镁合金的晶体结构属于密排六方......
concentration on oxidation characteristic of soot are investigated. The activation energy of soot increases with the increase of ageing temperature and oxygen concentration. The activation energy... strategy. Key words: thermal ageing; oxidation performance; soot nanostructure; activation energy Cite this article as: MENG Zhong-wei, LI Jian, ZHANG Qian, HUANG Jun-feng, JIANG Yuan, QIN Yuan, G G......
in interfacial reaction layers, and multi-layer interfacial reaction compounds form. Alloying element Nb in matrix remarkably diffuses into interfacial reaction zone and changes the activation energy for the interfacial reaction layer growth following a role of parabolic rate. The activation energy (Qk) and (k0) of SCS-6 SiC/super α2 and SCS-6 SiC/Ti2AlNb are 317.664 kJ/mol, 175.709 kJ/mol and 5.4438×10－2......
(Cu50Zr42Al8)96Y4块状非晶的变温晶化行为屠鹏1,寇生中2(1.甘肃省兰州市甘肃农业大学2.兰州理工大学,兰州 730050)摘 要:研究(Cu50Zr42Al8)96Y4大块非晶合金在连续升温过程中的晶化行为.结果表明,随升温速度的加快,玻璃转变温度Tg,晶化起始温度Tx,晶化峰值温度Tp都向高温区移动,过冷温度区△Tx扩大到了72.5K.运用Kissinger法分别计算出玻璃转变激活能Eg为512.34kJ/mol,晶化起始激活能Ex为372.44kJ/mol,晶化峰的激活能Ep1和Ep1为4......
