材料期刊网，材料期刊，材料类期刊，材料期刊投稿

The synthesis, processing and mechanical properties of the light metals, aluminum,magnesium and titanium Produced by advanced techniques are reviewed. Synthesis techniques to be addressed will include rapid solidification, spray deposition, mechanical alloying, plasma Processing and vapor deposition.

关键词: :synthesis/processing , null , null , null , null , null , null , null , null , null , null

惰性气体冷凝法制备镁纳米颗粒的工艺及机制

王涵 , 宋西平 , 窦娜娜 , 李如峰 , 张蓓

稀有金属材料与工程

以纯度为99.9％的镁粉为原料,采用惰性气体冷凝法来制备镁纳米颗粒,研究了蒸发温度及沉积位置对镁纳米颗粒形貌和尺寸的影响.结果表明,蒸发温度为600℃时,在冷阱最前端得到了直径为10～50 nm的镁纳米颗粒,纳米颗粒之间相互连接呈链状形态,并且在镁纳米颗粒之间发现了镁纳米线.结果还表明,随着蒸发温度升高,得到的镁纳米颗粒尺寸增大;随着沉积位置的变化,其镁纳米颗粒尺寸也发生规律性变化.根据气/固相变理论及机制,对镁纳米颗粒的形成过程进行了解释,提出了相应的镁纳米颗粒的形成模型.

关键词: 惰性气体冷凝法 , 镁 , 纳米颗粒 , 纳米线

HIGH TEMPERATURE CRACK PROPAGATION AND FRACTUREOF SUPERALLOYS

Author X.S. Xie , Z.C. Xu and J.X. Dong High Temperature Materials Research Laboratory , University of Science and Technology Beijing , Beijing 100083 , ChinaManuscript received 18 October 1998

金属学报(英文版)

High temperature crack propagation and fracture behavior of disks produced by six superalloys have been studied. Crack propagation rates were determined at 650 creep, fatigue and creep/fatigue interaction conditions. The crack propagation rate is raised with increasing strength of superalloy and is also increased with the dwelling time at maximum stress level of cyclic creep test condition. Crack propagation behavior is closely related to high temperature ductility (such as creep strain and stress rupture elongation). Ductility improvement can increase crack propagation resistance by means of softening heat treatment, controlling grain boundary precipitate and microalloying treatment (such as Mg addition to superalloy). \=

关键词: crack propagation , null , null , null

材料期刊网

ADVANCED SYNTHESIS OF LIGHT METALS

惰性气体冷凝法制备镁纳米颗粒的工艺及机制

HIGH TEMPERATURE CRACK PROPAGATION AND FRACTUREOF SUPERALLOYS

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