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金属学报    DOI: 10.11900/0412.1961.2014.00485
  论文 本期目录 | 过刊浏览 |
微量添加Sn、Nb对Zr-Cu-Fe-Al块体非晶合金热稳定性和塑性的影响
杨滨,李鑫,罗文东,李宇翔
北京科技大学
EFFECT OF MINOR SN, NB ADDITIONS ON THE THERMAL STABILITY AND COMPRESSIVE PLASTICITY OF ZR-CU-FE-AL BULK METALLIC GLASS
University of Science & Technology Beijing
全文: PDF(937 KB)  
摘要: 采用铜模铸造方法制备了直径2和3 mm的Zr61.5Cu21.5-xFe5Al11Sn1Nbx(x=0, 1, 2 原子分数%)和Zr61.5Cu21.5Fe5Al12非晶合金棒。结果表明, Sn和Nb微合金化略微降低了Zr-Cu-Fe-Al非晶合金的玻璃形成能力。Zr61.5Cu19.5Fe5Al11Sn1Nb2非晶合金具有优异的压缩塑性,并且表现出“应变硬化”现象。高分辨透射电镜显示Zr61.5Cu19.5Fe5Al11Sn1Nb2和Zr61.5Cu21.5Fe5Al12合金均为完全非晶态,Sn和Nb微合金化后合金内部原子排列更紧密。正电子湮没谱分析结果表明,与Zr61.5Cu21.5Fe5Al12非晶合金相比,Zr61.5Cu19.5Fe5Al11Sn1Nb2非晶合金内部原子密排间隙和结构自由体积尺寸减小、总量增加。大量弥散分布的自由体积有利于Zr61.5Cu19.5Fe5Al11Sn1Nb2非晶合金剪切带的形成、分枝和相互作用,最终改善了非晶合金的塑性。
关键词 Sn和Nb微合金化Zr-Cu-Fe-Al块体非晶热稳定性塑性    
Abstract:New Ni-free Zr61.5Cu21.5-xFe5Al11Sn1Nbx (x=0,1, 2 atomic fraction, %) and Zr61.5Cu21.5Fe5Al12 bulk metallic glasses (BMGs) rods with a diameters of 2 and 3 mm were fabricated by copper mold casting. In order to improve the plasticity of the Zr61.5Cu21.5Fe5Al12 BMG, minor Sn and Nb elements with lower thermal neutron cross-sections have been added into the Zr-Cu-Fe-Al alloy. The experimental results showed that the glass-forming abilities of the BMGs with Sn and Nb elements were reduced slightly. Among them with Sn and Nb elements, however, Zr61.5Cu19.5Fe5Al11Sn1Nb2 BMG exhibits high compressive strength, high ductility together with extensive ‘‘work hardening’’. HRTEM study verifies the glassy states of both Zr61.5Cu19.5Fe5Al11Sn1Nb2 and Zr61.5Cu21.5Fe5Al12 alloys samples. The difference between the microstructures of the BMGs samples with and without Sn and Nb elements is that the atomic arrangement in Zr61.5Cu19.5Fe5Al11Sn1Nb2 BMG is more closely than that in Zr61.5Cu21.5Fe5Al12 BMG. Positron annihilation lifetime spectroscopy study showed further that the Zr61.5Cu19.5Fe5Al11Sn1Nb2 BMG has more closely atomic arrangement than the Zr61.5Cu21.5Fe5Al12 BMG. The structural free-volume size of the former BMG is smaller than that of the latter BMG. And the total free-volume amount of the former BMG is obviously higher than that of the latter BMG. Uniformly distributed free volume is beneficial to improve the shear band formation, branching, and interactions of the Zr61.5Cu19.5Fe5Al11Sn1Nb2 BMG, which increases finally the compressive ductility of the BMG.
Key wordsMinor Sn and Nb additions    Zr-Cu-Fe-Al bulk metallic glass    thermal stability    plasticity
收稿日期: 2014-09-02     
基金资助:北京市自然科学基金
通讯作者: 杨滨   
Corresponding author: BIN YANG   

引用本文:

杨滨 李鑫 罗文东 李宇翔. 微量添加Sn、Nb对Zr-Cu-Fe-Al块体非晶合金热稳定性和塑性的影响[J]. 金属学报, 10.11900/0412.1961.2014.00485.

链接本文:

http://www.ams.org.cn/CN/Y0/V0/I0/0

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