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Microstructure and corrosion behavior of zr–1.0Cr–0.4Fe–xMo alloys

Rare Metals 2015年第2期34卷 118-124页

作者： Tian-Guo Wei Lu Zhang Zhi Miao Hong Liu Bai-Feng Luan Wen Wang Chong-Sheng Long Reactor Fuel and Materials Key Laboratory Nuclear Power Institute of China Nuclear and Radiation Safety Ministry of Environmental Protection Institute of Material Science and Technology Chongqing University

Possibility of using Mo as an alloying element in zr-based alloys was attractive in terms of microstructure refinement and mechanical properties strengthening. In this research, zr–1.0Cr–0.4Fe–xMo（0, 0.2, 0.4, and 0.6） alloys with different Mo contents were prepared by vacuum arcmelting method, the microstructure and the corrosion resistance of these alloys were investigated. Addition of Mo has a refinement effect on the microstructure; with the increase of Mo content, the a-laths in the as-cast samples and the grain size in the annealed samples decrease. zr–1.0Cr–0.4Fe–xMo alloys have large numbers of fine second-phase particles（SPPs） in the matrix, the area fraction of the SPPs is more than 10 %. With the increase of Mo content, the population density of the SPPs increases significantly, while the average diameter of the SPPs decreases. Mo addition also affects the texture; the intensity of basal pole texture aligning normal direction decreases with the increase of Mo content in the alloys.Compared with zr-4 and zr–1Nb, zr–1.0Cr–0.4Fe–xMo alloys have excellent corrosion resistance in 500 ℃/10.3 MPa steam. The corrosion rates of Mo-containing alloys are higher than that of Mo-free alloy, which is mainly attributed to the solute Mo atoms in the zr matrix.Change of the SPPs features due to the increase of Mo content alleviates the degradation of corrosion resistance in some degree, but it is not the dominant factor.

关键词： zr-based alloys Mo addition Microstructures Second-phase particles Corrosion behavior

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Micro-alloying of yttrium in zr-based bulk metallic glasses

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Progress in Natural Science:Materials International 2011年第1期21卷 46-52页

作者： Wei-jie PENG,Yong ZHANG State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing,Beijing 100083,China State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing Beijing 100083 China

The effect of yttrium addition on the glass-forming ability(GFA) and mechanical properties of the zr-based (zr0.525Al0.1Ti0.05Cu0.179Ni0.146)100-xYxand(zr0.55Al0.15Ni0.1Cu0.2)100-xYx(x=0,0.2,0.4 0.6,1,2) alloys was studied.Micro-alloying of 0.6%yttrium enhances the room temperature ductility as well as the GFA of the zr-based alloys.The mechanism of enhancing the GFA and room temperature ductility was analyzed.It is indicated that proper yttrium addition stabilizes the undercooled liquid by means of forming lots of ordered clusters,thus improving the GFA and the room temperature ductility.

关键词： micro-alloying glass-forming ability zr-based alloys yttrium

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