微量添加Sn和Nb对Zr-Cu-Fe-Al块体非晶合金热稳定性和塑性的影响

doi:10.11900/0412.1961.2014.00485

金属学报

2015, Vol. 51

Issue (4): 465-472 DOI: 10.11900/0412.1961.2014.00485

本期目录 | 过刊浏览

微量添加Sn和Nb对Zr-Cu-Fe-Al块体非晶合金热稳定性和塑性的影响

杨滨^1,²(

), 李鑫¹, 罗文东¹, 李宇翔¹

1 北京科技大学新金属材料国家重点实验室, 北京100083
2 北京科技大学钢铁共性技术协同创新中心, 北京100083

EFFECT OF MINOR Sn AND Nb ADDITIONS ON THE THERMAL STABILITY AND COMPRESSIVE PLASTICITY OF Zr-Cu-Fe-Al BULK METALLIC GLASS

YANG Bin^1,²(

), LI Xin¹, LUO Wendong¹, LI Yuxiang¹

1 State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083
2 Collaborative Innovation Center of Universal Iron & Steel Technology, University of Science and Technology Beijing, Beijing 100083

引用本文:

杨滨, 李鑫, 罗文东, 李宇翔. 微量添加Sn和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, 2015, 51(4): 465-472.
Bin YANG, Xin LI, Wendong LUO, Yuxiang LI. EFFECT OF MINOR Sn AND Nb ADDITIONS ON THE THERMAL STABILITY AND COMPRESSIVE PLASTICITY OF Zr-Cu-Fe-Al BULK METALLIC GLASS[J]. Acta Metall Sin, 2015, 51(4): 465-472.

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摘要:

采用Cu模铸造方法制备了直径2和3 mm的Zr_61.5Cu_21.5_-_xFe₅Al₁₁Sn₁Nb_x (x=0, 1, 2, 原子分数, %)和Zr_61.5Cu_21.5Fe₅Al₁₂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. Zr_61.5Cu_19.5Fe₅Al₁₁Sn₁Nb₂非晶合金具有优异的压缩塑性, 并且表现出“应变硬化”现象. 高分辨透射电镜观察显示Zr_61.5Cu_19.5Fe₅Al₁₁Sn₁Nb₂和Zr_61.5Cu_21.5Fe₅Al₁₂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Zr_61.5Cu_21.5Fe₅Al₁₂非晶合金相比, Zr_61.5Cu_19.5Fe₅Al₁₁Sn₁Nb₂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Zr_61.5Cu_19.5Fe₅Al₁₁Sn₁Nb₂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 Zr_61.5Cu_21.5_-_xFe₅Al₁₁Sn₁Nb_x (x=0,1, 2, atomic fraction, %) and Zr_61.5Cu_21.5Fe₅Al₁₂bulk metallic glasses (BMGs) rods with diameters of 2 and 3 mm were fabricated by copper mold casting. In order to improve the plasticity of the Zr_61.5Cu_21.5Fe₅Al₁₂BMG, minor Sn and Nb with lower thermal neutron cross-sections was 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, Zr_61.5Cu_19.5Fe₅Al₁₁Sn₁Nb₂ BMG exhibits high compressive strength, high ductility together with extensive “work hardening”. HRTEM study verifies the glassy states of both Zr_61.5Cu_19.5Fe₅Al₁₁Sn₁Nb₂ and Zr_61.5Cu_21.5Fe₅Al₁₂alloys samples. The difference between the microstructures of the BMGs samples with and without Sn and Nb elements is that the atomic arrangement in Zr_61.5Cu_19.5Fe₅Al₁₁Sn₁Nb₂BMG is more closely than that in Zr_61.5Cu_21.5Fe₅Al₁₂ BMG. Positron annihilation lifetime spectroscopy study showed further that the Zr_61.5Cu_19.5Fe₅Al₁₁Sn₁Nb₂ BMG has more closely atomic arrangement than the Zr_61.5Cu_21.5Fe₅Al₁₂ 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 Zr_61.5Cu_19.5Fe₅Al₁₁Sn₁Nb₂ BMG, which increases finally the compressive ductility of the BMG.

Key words： minor Sn and Nb additions Zr-Cu-Fe-Al bulk metallic glass thermal stability plasticity

ZTFLH:

TG113.2

基金资助:*北京市自然科学基金项目2122039, 长江学者和创新团队发展计划和北京科技大学新金属材料国家重点实验室自主课题项目资助

作者简介: null

杨滨, 男, 1960年生, 教授

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https://www.ams.org.cn/CN/10.11900/0412.1961.2014.00485 或 https://www.ams.org.cn/CN/Y2015/V51/I4/465

图1 Zr61.5Cu21.5-xFe5Al11Sn1Nbx (x=0,1, 2, 原子分数, %)与Zr61.5Cu21.5Fe5Al12 (Z1)非晶合金的XRD谱

图2 Zr61.5Cu19.5Fe5Al11Sn1Nb2 (Z2)和Z1非晶合金的DSC曲线

表1 Z2和 Z1非晶合金的热力学参数及热中子吸收截面数据

图3 Z2非晶合金在不同升温速率下的DSC曲线

表2 Z2和Z1[10]非晶合金的表观激活能

图4 Z2非晶合金的玻璃转变温度Tg, 第一晶化峰温度Tp1, 第二晶化峰温度Tp2和晶化温度Tx的Kissinger曲线

图5 Z2和 Z1非晶合金在4×10-4 s-1应变速率下的压缩工程应力-应变曲线

表3 Z2和Z1非晶合金室温压缩力学性能

图6 Z2和Z1非晶合金HRTEM像和相应的SAED花样以及反Fourier变化图像

图7 Z2和Z1非晶合金压缩试样断口的SEM像

图8 Z2和Z1非晶合金的DSC曲线及玻璃转变温度附近的放大图

表4 Z2和Z1非晶合金正电子湮没三寿命谱拟合结果

表5 Z2与Z1非晶合金正电子湮没二寿命谱拟合结果

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