及其對力學(xué)性能的影響
(上海交通大學(xué) 材料科學(xué)與工程學(xué)院, 上海 200030)
摘 要: 應(yīng)用Rietveld模擬計算和實驗X射線衍射分析合金元素V、 Nb和Mo在ZrCr2 Laves相金屬間化合物中的晶格占位， 研究合金化對ZrCr2 Laves相力學(xué)性能的影響。 研究結(jié)果表明: 合金元素V和Mo占據(jù)ZrCr2 Laves相金屬間化合物中Cr原子的晶格位置， 而Nb則占據(jù)Zr原子的晶格； 添加合金元素V、 Nb和Mo使ZrCr2 Laves相化合物硬度及脆性度降低， 斷裂韌度顯著提高， 即合金化對ZrCr2 Laves相起軟化作用。 初步探討合金元素對ZrCr2 Laves相力學(xué)性能的影響機制。
關(guān)鍵字: ZrCr2 Laves相; 晶格占位； 合金化； 力學(xué)性能
（School of Materials Science and Engineering,
Shanghai Jiao Tong University, Shanghai 200030, China）
Abstract: The lattice-substitution of alloying elements V, Nb and Mo in the ZrCr2 Laves phase was analyzed by Rietveld simulation and X-ray diffractiometry. The effects of alloying on mechanical properties were also investigated. The results show that the alloying elements V and Mo occupy the Cr site, while Nb occupies the Zr site in the ZrCr2 Laves phase. The hardness and brittleness of ZrCr2 Laves phase decrease, the fracture toughness is enhanced with the addition of alloying elements V, Nb and Mo, which implies that alloying has a softening effect on the mechanical properties of the ZrCr2 Laves phase. Finally, the mechanism of alloying on mechanical properties of the ZrCr2 Laves phase was discussed.
Key words: ZrCr2 Laves phase; lattice-substitution; alloying; mechanical properties
