Microstructures and mechanical properties of directionally solidified multi-element Nb-Si alloy
Microstructures and mechanical properties of directionally solidified multi-element Nb-Si alloy作者机构：National Key Laboratory of Science and Technology on Advanced High Temperature Structural Materials Beijing Institute of Aeronautical Materials State Key Laboratory of Solidification Processing Northwestern Polytechnical University
出 版 物：《Progress in Natural Science:Materials International》 (自然科学进展·国际材料(英文))
年 卷 期：2011年第21卷第2期
页 面：146-152页
核心收录：
学科分类：07[理学] 070205[理学-凝聚态物理] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学]
基 金：supported by the fund of National Key Laboratory of Science and Technology on Advanced High Temperature Structural Materials in BIAM(9140C4301041001) the fund of the State Key Laboratory of Solidification Processing in NWPU (SKLSP201109)
主 题：Nb-Si system in-situ composite directional solidification microstructure mechanical property
摘 要：Nb-Si system in-situ composites with nominal composition of Nb-21Ti-16Si-7Cr-3Al-2Hf（mole fraction,%） were prepared by directional solidification technology in an optical floating zone furnace at the growth rates of 3,5,8 and 12 mm/*** microstructures and mechanical properties were investigated as a function of the growth *** results show that the solidification microstructures consist of Nb solid solution（Nbss）,α-Nb5Si3andβ-*** with high aspect ratio grow continuously and straightly when the growth rate is 5mm/h;lower or higher growth rates are disadvantageous for the formation of favorable directional *** compressive strength at 1 250℃and room-temperature fracture toughness of the specimen with the growth rate of 5 mm/h that exhibits excellent mechanical properties are 415 MPa and 22.4 MPa·m1/2,respectively.
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