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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 12    No. 6    December 2002

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Effect of Mn content on microstructure and
mechanical properties of modified ZA-27 alloy
LI Yuan-yuan(李元元), LONG Yan(龙 雁),CHEN Wei-ping(陈维平),
ZHANG Da-tong(张大童),SHAO Ming(邵 明)

College of Mechanical Engineering,South China University of Technology,
Guangzhou 510640, China

Abstract:ZA-27 alloys reinforced by Mn-containing intermetallic compounds were prepared and the effect of Mn content on their mechanical properties were examined. By adding Mn, rare earth elements(RE) and Ti into ZA-27, experimental alloys were fabricated by sand casting. The volume fraction, grain size and morphology of the Mn-containing intermetallic compound phases vary with the changing of Mn content. Mechanical properties of the reinforced ZA-27 alloys at elevated temperatures were measured. The results show that the hardness, compressive strength and compressibility of experimental alloys increase with increasing Mn content until they reach a maximum at 0.5% Mn. Excessive and coarse hard phases would act as crack origins instead of dispersion strengthening particles. Best tensile properties of these alloys at elevated temperature can be achieved at a Mn content of 0.18 %.

 

Key words:  ZA-27; intermetallic compounds; mechanical properties

ISSN 1672-7029
CN 43-1423/U

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