钛对ZA27合金组织和热疲劳性能的影响

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基金项目:

江苏省自然科学基金项目(BK2011524)；江苏大学“科技创新团队”资助。

Effect of Ti on the Microstructure and Thermal Fatigue Property of ZA27 Alloy

1. School of Material Science and Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu, China;
2. Zhenjiang Innov Alloy Co., Ltd, Zhenjiang 212009, Jiangsu, China

摘要: 研究了钛变质处理对ZA27合金的组织和热疲劳性能的影响。通过光学显微镜和扫描电镜观察试样的显微组织和热疲劳裂纹形貌,分析钛的变质机理和合金热疲劳损伤机制。结果表明:经钛变质处理后,ZA27的组织明显细化,初生α-A1相由粗大的树枝晶变为细小的花瓣状枝晶。合金塑性、韧性有较大幅度的提高,从而提高了其热疲劳性能。当Ti的添加量为0.3%时,ZA27合金热疲劳性能最好。
- 钛 /
- ZA27合金 /
- 变质处理 /
- 显微组织 /
- 热疲劳
Abstract: The effect of Ti modification on microstructure and thermal fatigue property of ZA27 alloy is discussed in this paper.The samples’ microstructure and morphologies of cracks caused by thermal fatigue are examined by optica1 microscopy（OM） and scanning electron microscopy（SEM）,and mechanism of Ti modification and thermal fatigue damage are analyzed.The results show that after Ti modification,the grains are obviously refined and primary α-A1 phases are found to vary from thick dendrite to fine petal-shaped dendrite.The plasticity and toughness of ZA27 are significantly increased,which results in the improvement of the thermal fatigue property.With a Ti addition at 0.3%,ZA27 exhibits the best thermal fatigue property.
- Ti /
- ZA27 alloy /
- modification treatment /
- microstructure /
- thermal fatigue