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al． Irradiation induced precipi￾tates in vanadium alloys studied by atom probe microanalysis． J Nucl Mater，2007，367: 858 ［23］ Heo N J，Nagasaka T，Muroga T，et al． Effect of impurity levels on precipitation behavior in the low-activation V--4Cr--4Ti alloys． J Nucl Mater，2002，307: 620 ［24］ Nishimura A，Iwahori A，Heo N J，et al． Effect of precipitation and solution behavior of impurities on mechanical properties of low activation vanadium alloy． J Nucl Mater，2004，329: 438 ［25］ Nagasaka T，Muroga T，Hino T，et al． Impurity behavior in V-- 4Cr--4Ti--Y alloys produced by levitation melting． J Nucl Mater， 2007，367: 823 ［26］ Chen J M，Muroga T，Nagasaka T，et al． Precipitation behavior in V--6W--4Ti，V--4Ti and V--4Cr--4Ti alloys． J Nucl Mater， 2004，334( 2) : 159 ［27］ Li Y F，Luo C，Wang Z G，et al． Microstructure of V--4Cr--4Ti alloy fabricated by vacuum arc remelting of consumable elec￾trode． Chin J Nonferrous Met，2008，18( 5) : 805 ( 李鱼飞，罗超，王志钢，任大鹏，等． 真空自耗电弧重熔 V-- 4Cr--4Ti 合金的微观组织结构． 中国有色金属学报，2008，18 ( 5) 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