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�������պ����ѧѧ�� 2010, Vol. 36 Issue (10) :1213-1216    DOI:
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Glass forming ability and thermal stability of Zr-Al-(Ni-Cu) alloys
Zhang Jing, Zhang Tao*
School of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China

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Abstract�� Glass forming ability (GFA) of Zr-Al-(Ni-Cu) alloys with different Ni and Cu element contents was studied by injection copper mold casting method. Structures of the as-cast alloys, sliced along the cross-section, were identified by X-ray diffraction (XRD). Thermal properties of the bulk metallic glasses (BMG) were analyzed by differential scanning calorimetry (DSC). Results reveal that the critical diameters for glass formation of the ternary Zr-Al-Ni and Zr-Al-Cu alloys were highly improved by the coexistence of the similar elements (elements with similar atomic sizes and chemical properties) Ni and Cu in the quaternary Zr-Al-(Ni-Cu) alloys. For the Zr65Al7.5Ni10Cu17.5 alloy, which is the best glass former in the studied alloy system, BMG rod of 7�@mm in diameter was successfully synthesized. It is suggested that the significant improvement of GFA is attributed to the increase in the entropy and the decrease in free energy of the Ni and Cu substituted alloy systems.
Keywords�� metallic glass   X ray diffraction   glass forming ability   thermal properties   differential scanning calorimetry   component coexistence criterion     
Received 2009-04-26; published 2010-11-12


About author: �� �(1981-),Ů,ɽ��������,��ʿ��,zhangjing@mse.buaa.edu.cn.
���, ����.Zr-Al-(Ni-Cu)�Ͻ�ķǾ��γ���������ѧ����[J]  �������պ����ѧѧ��, 2010,V36(10): 1213-1216
Zhang Jing, Zhang Tao.Glass forming ability and thermal stability of Zr-Al-(Ni-Cu) alloys[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2010,V36(10): 1213-1216
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