抗Zr“中毒”Al-Ti-B-C中间合金对7050铝合金力学性能的影响

doi:10.11868/j.issn.1001-4381.2016.000687

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通过场发射扫描电子显微镜 (FESEM)，X射线衍射仪 (XRD)，能量色谱仪 (EDS) 分析Al-5Ti-1B，Al-4Ti-1C和Al-5Ti-0.8B-0.2C中间合金的微观组织与物相组成，比较研究3种中间合金对7050铝合金晶粒尺寸与力学性能的影响。结果表明：Zr的存在削弱了Al-5Ti-1B和Al-4Ti-1C中间合金的细化效果，而对Al-5Ti-0.8B-0.2C中间合金细化效果影响较小。含掺杂型TiC粒子的Al-5Ti-0.8B-0.2C中间合金具有较好的抗Zr“中毒”能力，加入量为0.2% (质量分数，下同) 时，含Zr7050铝合金平均晶粒尺寸由200 μm细化至 (60±5) μm，室温极限抗拉强度由405 MPa提高到515 MPa，提高了27.2%，伸长率由2.1%提高到4.1%。而加入0.2%的Al-5Ti-1B或Al-4Ti-1C中间合金时晶粒尺寸较粗大且分布不均匀，表现出明显的细化“中毒”。

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关键词 ： 7050铝合金, 晶粒细化, Zr“中毒”, Al-Ti-B-C中间合金, 力学性能

Abstract：

The microstructure and phase composition of Al-5Ti-1B, Al-4Ti-1C and Al-5Ti-0.8B-0.2C master alloys were investigated by field emission scanning electron microscopy (FESEM), X-ray diffraction (XRD) and energy dispersive spectrometer (EDS), and the effects of the three kinds of master alloys on the grain size and mechanical properties of 7050 alloy were investigated. The results show that the existence of Zr reduces the grain refining effects of Al-5Ti-1B and Al-4Ti-1C master alloys, but hardly influences the refinement of Al-5Ti-0.8B-0.2C master alloy. The reason is that Al-5Ti-0.8B-0.2C containing B-doped TiC can resist Zr-poisoning, and after adding 0.2% (mass fraction) Al-5Ti-0.8B-0.2C, the average grain size of 7050 alloy is reduced from about 200μm to (60±5) μm, the ultimate tensile strength increases from 405 MPa to 515 MPa, increasing by 27.2%, and the elongation rate increases from 2.1% to 4.1%. However, after adding 0.2% Al-5Ti-1B and Al-4Ti-1C master alloys, the grain size is larger and the distribution is uneven, exhibiting obvious "refinement poisoning" phenomenon.

Key words： 7050 aluminum alloy grain refinement Zr-poisoning Al-Ti-B-C master alloy mechanical property

收稿日期: 2016-06-07 出版日期: 2017-04-17

中图分类号:

TG146.2

基金资助:国家自然科学基金资助项目(51001065);山东大学青年学者未来计划项目(YSPSDU)

通讯作者: 武玉英 E-mail: wuyuying@sdu.edu.cn

作者简介: 武玉英 (1982－)，女，博士，副教授，从事轻质合金细化及强韧化，联系地址：山东省济南市历下区经十路17923号山东大学千佛山校区 (250061)，E-mail:wuyuying@sdu.edu.cn

引用本文:

张国君, 武玉英, 杨化冰, 刘桂亮, 孙谦谦, 刘相法. 抗Zr“中毒”Al-Ti-B-C中间合金对7050铝合金力学性能的影响[J]. 材料工程, 2017, 45(4): 1-8.
Guo-jun ZHANG, Yu-ying WU, Hua-bing YANG, Gui-liang LIU, Qian-qian SUN, Xiang-fa LIU. Influence of Anti Zr-poisoning Al-Ti-B-C Master Alloy on Mechanical Properties of 7050 Aluminum Alloy. Journal of Materials Engineering, 2017, 45(4): 1-8.

链接本文:

http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2016.000687 或 http://jme.biam.ac.cn/CN/Y2017/V45/I4/1

Table 1 7050铝合金名义成分

Fig.1 KBI环型模具示意图

Fig.2 不同中间合金的微观组织及能谱分析
(a) Al-Ti-B; (b) Al-Ti-C; (c), (d) Al-Ti-B-C; (e) 点A的EDS分析; (f) 点B的EDS分析

Fig.3 Al-Ti-B-C中间合金XRD的测试结果

Fig.4 Al-Ti-B-C中间合金中TiC粒子线扫描分析

Fig.5 不同中间合金细化7050铝合金保温5 min时微观组织
(a) 未添加中间合金; (b) 添加0.2% Al-Ti-B; (c) 添加0.2% Al-Ti-C; (d) 添加0.2% Al-Ti-B-C; (1) 7^#; (2) 7^#-Zr

Fig.6 不同中间合金细化后7050铝合金平均晶粒尺寸

Fig.7 不同中间合金对7050铝合金力学性能的影响
(a) 极限抗拉强度和硬度; (b) 伸长率

Fig.8 不同中间合金细化后7050铝合金晶粒尺寸与力学性能关系

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