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.
出处
《铸造》
CAS
CSCD
北大核心
2013年第12期1156-1160,共5页
Foundry
基金
科技部国家火炬计划(2011GH040562)
