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; formation enthalpy; first principles; Wagner-Schottky model金属间化合物具有密度小,强度高和高温力学性能好等优点,是一类重要的航空航天用高温结构材料[1-2],特别是TiAl系金属间化合物已成功应用于飞机引擎,机体以及汽车阀摇杆等许多重要结构部件[3-4].金属间化合物中存在多种类型的热力学点缺陷,其性质和行为比较复杂,其浓度受温度和材...; (4) 式中:ETiAl是L10-TiAl完整晶胞的能量. 图2 L10-TiAl形成焓与成分之间的关系 Fig. 2 Relationship between of formation enthalpy and composition of L10-TiAl 根据式......
Studies on Standard Formation Enthalpies of Rare Earth Compounds by Using Structural Parameters YANG Feng1,FENG Lin2 (1.Wuhan Institute of Science and Technology, Wuhan 430073, China;2.School... P＝Σni=1Pi are defined. The standard formation enthalpies (ΔfHφm) of 74 species of rare earth compounds were studied with P, and the correlation coefficient is R＞0.94. The structural factors......
Formation mechanism of external finned tubes by extrusion-plough method TANG Yong(汤 勇), LU Long-sheng(陆龙生), PAN Min-qing(潘敏强), LIU Xiao-kang(刘小康), LIU Xiao-qing(刘晓晴) College of Mechanical Engineering, South China University of Technology, Guangzhou 510640, China Received 20 April 2006; accepted 30 June 2006 Abstract: The formation mechanism of bulge on the work’s surface during......
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probe microanalysis) scans at different locations along the cladding sheet and within the joint zone. Subsequently, the diffusion coefficients were used to predict the residue clad layer formation...; diffusion coefficient; aluminum alloy; brazed joint formation......
J. Cent. South Univ. Technol. (2008) 15: 89-94 DOI: 10.1007/s11771-008-0018-7 Formation mechanism of breccia pipe type in Yixingzhai gold deposit SHAO Yong-jun(邵拥军), ZHANG Yi-zhou... mineral composition, structure and construction, typical mineralization alteration phenomenon on field and microscopic anatomy in breccia pipes. And the ore-controlling mechanism and the formation......
J. Cent. South Univ. (2018) 25: 2664-2676 DOI: https://doi.org/10.1007/s11771-018-3944-z Path planning for UAVs formation reconfiguration based on Dubins trajectory CHEN Qing-yang(陈清阳)1, LU Ya-fei... 2018 Abstract: Multiple UAVs are usually deployed to provide robustness through redundancy and to accomplish surveillance, search, attack and rescue missions. Formation reconfiguration was inevitable......
of these binary systems, a set of thermodynamic functions were optimized by using the CAL-PHAD technique. The enthalpy of mixing and the interaction parameter of the liquid phase were predicted from known data for the LaI3-MI systems. Key words:phase equilibria; LaI3-MI systems; CALPHAD technique; enthalpy of mixing; rare earths; [全文内容正在添加中] ......
的温度火用会逐渐增加,而压力火用则会逐渐减小.根据式(12)可得,空气的焓火用也会逐渐增加. 图5 烧结矿进口温度对空气温度火用,压力火用和焓火用的影响 Fig. 5 Effect of sinter inlet temperature on air temperature exergy, pressure exergy and enthalpy exergy 2.2 空气进口流量的影响 在烧结... drop 图7 空气进口流量对空气温度火用,压力火用和焓火用的影响 Fig. 7 Effect of air inlet flow rate on air temperature exergy, pressure exergy and enthalpy exergy 2.3 空气进口温度的影响 在烧结矿进口温度为923 K和空气进口流量为190 kg/s条件下,空气出口温度和气流压力降随空气进口温度的......
