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两种铸造镍基高温合金在长期时效期间的微观组织和力学性能演变秦学智1,郭建亭1,袁超1,侯介山1,周兰章1,叶恒强1(1.辽宁省沈阳市科学院金属研究所)摘 要:长期时效期间K452和K446合金中的γ′相形貌都保持球形,尺寸不断粗化,但K446中γ′相的粗化速率总体上比K452快.初生MC的热稳定性不仅与MC本身的化学成分密切相关,而且与合金成分有关;合金中γ基体的热稳定性(即晶内二次碳化物或TCP相的析出)与初生MC的热稳定性有关;晶界粗化通过γ′沉淀及镶嵌于其中的碳化物(M23C6或M6C)的析出和长大来实现......
Hydrothermal growth of Ni-based coatings on copper substratesFang Liu and Yong Zhang School of Materials Science and Engineering,Dalian Jiaotong University,Dalian 116028,China摘 要:Ni-based coatings were deposited on copper substrates by a hydrothermal approach.The results showed that a Ni-based cellular microstructure was bridged by "fiber-like......
. The fracture surface is characterized as typical cleavage fracture and it mainly consists of massive brittle Al3NiTi2 intermetallics. Key words: γ-TiAl alloy; Ni-based superalloy; vacuum brazing... superalloys is their high density of 8-9 g/cm3, which will increase the weight of airplane and consume much more fossil fuel [1,2]. TiAl alloy has the merits of low density (only half of traditional Ni-based......
Portevin-Le Chatelier effect in wrought Ni-based superalloys:Experiments and mechanismsChuanyong Cui,Rui Zhang,Yizhou Zhou,Xiaofeng SunInstitute of Metal Research, Chinese Academy of Sciences摘 要... serrated yielding in the temporal domain and strain localization in the spatial domain. Wrought Ni-based superalloys often exhibit the PLC effect. To guarantee the safe and stable operation......
The Strengthening of Cu-15Ni-8Sn Alloy WANG Ming-Pu1,WANG Yan-hui1,HONG Bin1 (1.School of Material Science and Engineering, Central South University, Changsha China) 摘要:The microstructure, property and relation between them of Cu-15Ni-8Sn alloy are studied by means of TEM and the measurement of hardness. The results show that γ '' metastable phase strengthens alloy because of its ordering......
barrier layer at the onset of oxidation. Key words: Ni-based composite; electrodeposition; high-temperature oxidation; La2O3; CeO2; reactive element effect; oxidation mechanism 1 Introduction... has been put into electrodeposition of Ni-based composite. With the codeposition of small amount of reactive elements oxides, such as Y2O3, CeO2 and La2O3, the oxidation resistance of Ni film can......
. 5 Conclusions 1) About 8 mm-high built-up coating of NiCoCrAlYTa alloy can be deposited on a DS DZ22 Ni-based superalloy blade tip by electro-spark epitaxial growth process. 2) The built-up... Electro-spark epitaxial deposition of NiCoCrAlYTa alloy on directionally solidified nickel-based superalloy WANG Mao-cai(王茂才)1, WANG Wei-fu(王维夫)1, 2, XIE Yu-jiang(谢玉江)1, ZHANG Jie(张 杰)1 1......
The Technological Improvements of Aluminum Alloy Coloring by Electrolysis LI Nai-jun1 (1.Teachers College, Shenyang University, Shenyang 110015, P. R. China) 摘要:The technological process of coloring golden-tawny on aluminum alloy by electrolysis was improved in this paper. The optimum composition of electrolyte was found, the conditions of deposition and anodic oxidation by electrolysis were......
, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China) Abstract: The oxidation of binary Ni-Al alloy containing 15%(mole fraction, the same below if not mentioned) Al... in contact with the alloy presenting only trace of NiO and the Ni-Al spinel. As a result, the kinetics of Ni-15Al shows a fast initial stage followed by two subsequent parabolic stages with decreasing rate......
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