Effects of Ni addition on the microstructure and properties of nanostructured copper-germanium alloys

详细信息    查看全文

• 作者：Mahboobeh Nazarian-Samani^a ; ^b ; ^{Mahboobeh.Nazarian@gmail.com} ; Hassan Abdollah-Pour^a ; Omid Mirzaee^a ; Ali Reza Kamali^c ; ^{ark42@cam.ac.uk} ; Masoud Nazarian-Samani^b ; ¹ ; ^{Masoud.Nazarian@gmail.com}
• 关键词：A. Nanostructured intermetallics ; B. Thermal stability ; B. Phase transformation ; C. Mechanical alloying
• 刊名：Intermetallics
• 出版年：2013
• 出版时间：July, 2013
• 年：2013
• 卷：38
• 期：Complete
• 页码：80-87
• 全文大小：1268 K

文摘

The effects of Ni addition on the structure and various phase transitions of nanocrystalline Cu-Ge alloys were investigated for the first time. Cu₈₄Ge_16?xNi_x (x?=?0,1,3 and 5?wt. % ) alloys were mechanically alloyed at room temperature and evaluated by means of X-ray diffraction, differential thermal analysis, thermal gravimetry, and scanning and transmission electron microscopy observations. Nanocrystalline ¦Á?Cu(Ge) solid solution was observed to form during the early stages of mechanical alloying. After prolonged milling times, it was partially transformed into the ¦Æ?Cu₅Ge intermetallic compound with an hcp structure. Increased quantities of Ni in the alloys not only delayed the formation of the intermetallic phase upon mechanical alloying and the nanocrystallization transition during annealing but also decreased the crystallite and particle size, which gave rise to nanocrystalline alloys with a high thermal stability at temperatures near their melting points. The mechanism leading to the high stability achieved was also investigated and described.