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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 12    No. 2    April 2002

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Microstructure and hardness of
binary Cr-Ta alloys
ZHANG Zhao-sen(张兆森), HE Yue-hui(贺跃辉),
HUANG Bai-yun(黄伯云), PENG Chao-qun(彭超群)

State Key Laboratory for Powder Metallurgy,
Central South University, Changsha 410083, China

Abstract:The dependences of the microstructure and hardness of the binary Cr-Ta alloys [Cr-9.0, -9.2, -9.4, -9.6, -9.8, and -13.0 Ta] ( mole fraction, %) were investigated. When Ta content of the alloy is less than 9.4%,  there are primary dendrite grains of a Cr solid-solution phase existing in the matrix of Cr-Cr2Ta eutectic colonies in the alloy. Moreover, the regular polygon grains of the primary Cr2Ta Laves-phase are surrounded by the Cr-Cr2Ta eutectic colony in the hyper-eutectic Cr-9.4%Ta alloys. The scanning electron microphotograph shows that one of the Cr2Ta phase plates of an eutectic colony always connects with the primary Cr2Ta Laves-phase grain in a hyper-eutectic alloy. The eutectic colony size of Cr-Ta alloys decreases with increasing Ta. In addition, the macrohardness of Cr-Ta alloys is influenced by the chemical composition at room temperature. The binary eutectic Cr-Ta alloy presents the lowest hardness on a macrohardness scale.

 

Key words: binary Cr-Ta alloys; Ta content; Laves-phase

ISSN 1672-7029
CN 43-1423/U

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