Mechanism of Zirconium Poisoning Effect on TiB2 Inoculation in Aluminium Alloys

轻金属 Pub Date : 2016-02-07 DOI:10.1002/9781119274780.CH122

Y. Wang, Li Zhou, Z. Fan

引用次数: 4

Abstract

It was found that the efficiency of TiB2 inoculation to achieve grain refinement was decreased dramatically by Zr addition. In the present work, the mechanism of so-called “poisoning” effect was investigated by advanced analytical microscopy, including Cs-corrected high resolution STEM. For the first time, adsorption of Zr atoms was observed in a mono-layer on {0001} surface of TiB2. Significantly, atomic resolution STEM Z-contrast imaging revealed that the brightness of atomic columns in the monolayer varied periodically when viewing in \([10\bar 10]\) direction, indicating that the adsorbed Zr atoms in the layer were ordered in 2D. Deviation by 8 degrees from the well define orientation relationship, (0001)TiB2 8deg ~ (111)Al, and \({[11\bar 20]_{TiB2}}\parallel {[0\bar 11]_{A1}}\), was observed. The effect of Zr atom adsorption at the interface on mechanism of heterogeneous nucleation was discussed.

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锆中毒对铝合金TiB2接种的影响机制

结果表明，Zr的加入显著降低了TiB2接种对晶粒细化的效果。在本工作中，利用先进的分析显微镜，包括cs校正的高分辨率STEM，研究了所谓的“中毒”效应的机制。首次在TiB2的{0001}表面观察到Zr原子的单层吸附。值得注意的是，原子分辨率STEM z -对比度成像显示，在\([10\bar 10]\)方向观察时，单层原子柱的亮度周期性变化，表明层中吸附的Zr原子在二维中有序。观察到与井定义的定向关系(0001)TiB2 (111)Al和\({[11\bar 20]_{TiB2}}\parallel {[0\bar 11]_{A1}}\)偏差8度。讨论了界面吸附Zr原子对非均相成核机理的影响。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

轻金属

自引率

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发文量

11152

期刊介绍： "Light Metals" magazine is a national nonferrous metal metallurgy professional academic journal approved by the State Press and Publication Administration, supervised by the China Nonferrous Metals Industry Association, and sponsored by Shenyang Aluminum and Magnesium Design and Research Institute Co., Ltd. It is publicly distributed at home and abroad. "Light Metals" was founded in 1964. It is a monthly journal with a domestic unified journal number of 21-1217/TG and an international standard journal number of 1002-1752. "Light Metals" magazine was founded in 1964. It is a Chinese core scientific and technological journal in the field of metallurgy. It was founded earlier in the field of light metals in my country and has a large circulation. It is an industry-wide, authoritative, comprehensive and practical scientific and technological journal that reflects the status of my country's light metal industry.