(1.江蘇大學(xué) 材料科學(xué)與工程學(xué)院， 鎮(zhèn)江 212013;
2. 江蘇大學(xué) 理學(xué)院， 鎮(zhèn)江 212013)
摘 要: 采用定量金相、 拉伸試驗(yàn)、 電子探針和掃描電鏡等方法， 研究了復(fù)合稀土對CuZnAl合金晶粒尺寸、 晶粒生長動(dòng)力學(xué)、 力學(xué)性能的影響。 結(jié)果表明: 復(fù)合稀土可明顯細(xì)化合金晶粒， 改善合金的力學(xué)性能， 合金的拉伸斷口形貌由未加復(fù)合稀土的沿晶斷裂變?yōu)轫g窩狀塑性斷口， 同時(shí)保持合金的記憶性能。微觀分析表明: 復(fù)合稀土富集在CuZnAl合金的晶界上， 阻礙晶粒長大。 討論了晶粒細(xì)化機(jī)制以及合金力學(xué)性能提高的原因。
關(guān)鍵字: 復(fù)合稀土; CuZnAl合金; 晶粒細(xì)化; 力學(xué)性能
（1. School of Materials Science and Engineering,
Jiangsu University， Zhenjiang 212013， China;
2. Faculty of Science, Jiangsu University， Zhenjiang 212013, China）
Abstract:With the help of quantitative metallography， tensile test， electron probe method and scan electron microscopy， the influences of mischmetal on the grain size， dynamics of grain growth and mechanical properties of CuZnAl shape memory alloy were investigated. The results show that mischmetal can refine grains greatly， improve the mechanical properties remarkably and change the tensile fracture type from brittle bordered grains to plastic under the condition of maintaining shape memory properties. Moreover microstructures reveal that mischmetal which accumulates on the grain boundaries can restrain grains' growing. In addition， the mechanisms of refining grain size and improving mechanical properties are also discussed.
Key words: rare earth; CuZnAl alloys; mechanical property; shape memory alloys
