Effects of TM on stability of structure corresponding to prepeak of amorphous Al90TM5Ce5 Alloys

• 作 者: 赵芳 吴佑实
• 机 构: College of Materials Science and Engineering, Shandong University(South Campus),College of Material
• 出 处: Transactions of Nonferrous Metals Society of China
• 发表日期: 2002年06期
• 关键词: amorphous Al90TM5Ce5 alloy prepeak stability crystallization

X ray diffraction and DSC were used to investigate the crystallization process of amorphous Al 90 Fe 5Ce 5 and Al 90 Ni 5Ce 5 alloys, and the stability of the structure corresponding to the prepeak. Both these amorphous alloys are crystallized by two stages. The stability of the structure corresponding to the prepeak has a large difference. The structure corresponding to the prepeak for amorphous Al 90 Fe 5Ce 5 alloy is more stable than the amorphous matrix. However, it is not stable for amorphous Al 90 Ni 5Ce 5 alloys during the first crystallization stage. The prepeak position of amorphous Al 90 Ni 5Ce 5 alloys is very close to that of amorphous Al 90 Fe 5Ce 5 alloys. It is estimated that the prepeak is also due to diffraction peak broadening caused by very fine quasi crystalline structure and the structural unit is an icosahedral quasi crystalline structure with Ni as the central atom. The large difference of the stability of the structure corresponding to the prepeak is likely caused by different stability of the quasi crystalline structure.

X diffraction and DSC were used to investigate the crystallization process of amorphous Al90Fe5Ce5 and Al90Ni5Ce5 alloys, and the stability of the structure corresponding to the prepeak. Both these amorphous alloys are crystallized by two stages. The stability The structure corresponding to the prepeak has a large difference. The structure corresponding to the prepeak for amorphous Al 90 Fe 5Ce 5 alloy is more stable than the amorphous matrix. However, it is not stable for amorphous Al 90 Ni 5Ce 5 alloys during the first crystallization stage. The prepeak position of amorphous Al 90 Ni 5Ce 5 alloys is very close to that of amorphous Al 90 Fe 5Ce 5 alloys. It is estimated that the prepeak is also due to diffraction peak broadening caused by very fine quasi crystalline structure and the structural unit is an icosahedral quasi crystalline structure with Ni as the central atom. The large difference of the stability of the structure corr esponding to the prepeak is likely caused by different stability of the quasi crystalline structure.