混合稀土La+Y对ZCuAl_9Fe_4Ni_4Mn_2合金组织及热疲劳性能的影响  

Effect of Compound RE La+Y on Structure and Thermal Fatigue Property of ZCuAl_9Fe_4Ni_4Mn_2 Alloy

作　　者：李萌[1] 司乃潮[1] 万浩[1] 唐涛 管志峰 

机构地区：[1]江苏大学材料科学与工程学院,江苏镇江212013 [2]扬州电力设备修造厂,江苏扬州225003

出　　处：《铸造》2013年第12期1156-1160,共5页Foundry

基　　金：科技部国家火炬计划(2011GH040562)

摘　　要：采用自约束热疲劳试验机,对加入混合稀土La+Y的ZCuAl9Fe4Ni4Mn2合金进行热疲劳性能试验,并观察其组织变化。结果表明,稀土元素在铝青铜合金中具有良好的细化、变质作用;试样的抗拉强度随着混合稀土含量的增加而有所降低,而伸长率呈现上升的趋势。加入适量混合稀土La+Y对ZCuAl9Fe4Ni4Mn2合金的热疲劳性能有不同程度的提高。其中,加入0.167%混合稀土的热疲劳试样疲劳性能最佳,达到热疲劳裂纹萌生所需的热疲劳循环次数最多(6 000次),通过研究热疲劳裂纹扩展趋势图,发现热疲劳裂纹扩展呈现先快后慢,阶段性扩展特点。The thermal fatigue property of ZCuAl9Fe4Ni4Mn2 alloy with compound RE La＋Y was tested on self-restrict thermal fatigue experimental machine and the structure was observed. The results show that RE in aluminum bronze alloy has the effect of refining and modification; while the elongation shows a rising trend, tensile strength of samples decreases with the increasing of RE. The thermal fatigue property of ZCuAl9Fe4Ni4Mn2 alloys has obviously improved with suitable addition of compound RE La＋Y. The thermal fatigue property of alloys with 0.167% compound RE is the best, and the initiation of cracks reaches the highest thermal fatigue cycle index （6 000 times） . Dynamic relationship diagram of thermal fatigue cycle index and main crack length shows that the propagation of thermal fatigue crack is fast at first and then slowdown.

关 键 词：混合稀土La+Y ZCuAl9Fe4Ni4Mn2合金 热疲劳 裂纹 

分 类 号：TG115.57[金属学及工艺—物理冶金]