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采用光悬浮炉在氩气环境下制备了成分为Nb-14Si-22Ti-2Hf-2Al-4Cr的定向凝固试棒,研究了凝固工艺对合金相组成、组织形貌和高低温力学性能的影响,并与电弧熔炼态的合金进行了比较.结果表明,定向凝固试样相组成与电弧熔炼态相比没有发生变化,均由Nb基固溶体(Nb solid solution,Nbss)和Nb/Si化合物Nb5Si3组成,定向凝固合金Nbss呈枝晶状,硅化物呈板条状沿着生长方向分布.与电弧熔炼态相比,定向凝固速度为15和10 mm/h的合金在1250℃的抗压缩强度从电弧熔炼态的290 MPa分别提高到约442和493 MPa;15 mm/h的定向凝固后,合金的室温断裂韧性从电弧熔炼态的12 MPa·m1/2增加到15 MPa·m1/2.通过光悬浮定向凝固法制备的该合金具有优良的高低温力学性能.

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