The influence of rare earth metals on the structure of some rapidly solidified Ge- and Si-based alloys

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• 作者：Louzguine ; Dmitri V. ; Inoue ; Akihisa
• 关键词：Ge- and Si-based alloys ; Amorphous phase ; Phase transformation ; Crystalline structure
• 刊名：Materials Science and Engineering ; A
• 出版年：2001
• 期刊代码：61_09215093
• 类别：ms
• 出版时间：May 31, 2001
• 卷：304-306
• 期：Complete
• 页码：505-509
• 文件大小：496 K

摘要

Ge-rich amorphous alloys containing up to 70at.%Ge were produced by the optimization of the Al, Cr and RE (RE:rareearthmetals) content. Contrary to the Ge-based alloys, no positive influence of RE additions on the glass forming ability (GFA) of the Si–Al–TM and Si–Al alloys (TM:transitionmetals) was found. As no split of the first broad peak is seen in the X-ray diffraction patterns taken from the amorphous phase of the Ge–Al–RE alloys, one can suggest that such a feature observed in the Ge–Al–TM and Ge–Al–TM–RE alloys is affected by the presence of 3d TM. Peritectic-type phase transformation, amorphousphase+unknowncrystallinephase1→unknowncrystallinephase2, was observed in the Ge₆₀Al₂₅La₁₅ alloy and studied. The metastable crystalline phase 2 (Ge₁₂Al₅La₃) was found to have a tetragonal lattice with lattice parameters of a=0.559nm and c=0.528nm.