| Cr、Yb合金化对Al-Zn-Mg-Cu-Zr合金组织和断裂特征的影响 |
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| 引用本文： | 方华婵,陈康华,张 茁,刘 刚.Cr、Yb合金化对Al-Zn-Mg-Cu-Zr合金组织和断裂特征的影响[J].稀有金属材料与工程,2009,38(11):1960-1964. |
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| 作者姓名： | 方华婵 陈康华 张 茁 刘 刚 |
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| 作者单位： | 1. 中南大学,粉末冶金国家重点实验室,湖南,长沙,410083
2. 西安交通大学,陕西,西安,710048 |
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| 基金项目： | 国家自然科学基金资助项目，国家基础研究规划资助项，国防重点实验室项目 |
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| 摘 要： | 研究复合添加微量Cr、Yb、Zr对Al-Zn-Mg-Cu合金的显微组织和断裂特征的影响,分析其对合金韧化的作用机制.结果表明:在Al-Zn-Mg-Cu合金中复合添加Cr、Yb、Zr形成了含Cr、Yb、Zr的球形弥散相,这些均匀分布于基体上的弥散相能强烈钉扎位错和亚晶界,使基体保持形变回复组织,保持小角度晶界,抑制基体再结晶;T6态断裂机制主要为韧窝型穿晶断裂,与仅添加Zr相比,沿晶断裂抗力显著提高;晶界的无沉淀区(PFZs)较宽,且析出相在晶界呈明显不连续分布.
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| 关 键 词： | Al-Zn-Mg-Cu合金 再结晶 断裂特征 穿晶断裂 |
| 收稿时间： | 2008/10/26 0:00:00 |
Influence of Cr and Yb Alloying on the Microstructures and Fracture |
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| Fang Huachan,Chen Kanghu,Zhang Zhuo and Liu Gang.Influence of Cr and Yb Alloying on the Microstructures and Fracture[J].Rare Metal Materials and Engineering,2009,38(11):1960-1964. |
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| Authors: | Fang Huachan Chen Kanghu Zhang Zhuo and Liu Gang |
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| Affiliation: | State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;Xi' an Jiaotong University, Xi' an 710049, China |
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| Abstract: | The influence of complex Cr, Yb and Zr alloying on the microstructures and fracture characteristics of Al-Zn-Mg-Cu alloy has been investigated and the mechanism of toughening by adding Cr, Yb and Zr was analyzed. The results show that the Al-Zn-Mg-Cu alloy containing Cr, Yb and Zr may form the spherical dispersoids containing the Cr, Yb and Zr homogeneously distributed in the Al matrix, which can strongly pin the dislocation and subgrain boundaries, retain the deformation-recovery Al matrix with low angle boundary in the alloy and inhibit the recrystallization of Al matrix. By complex Cr, Yb and Zr alloying to Al-Zn-Mg-Cu alloy tempered as T6, the fractographs consist of dimple-type transgranular cracking with minor intergranular cracking. Compared with the Al-Zn-Mg-Cu-Zr alloy, the intergranular fracture resistance increases obviously, the precipitates free zone is wider with discontinuous distribution on the grain boundaries for the precipitates |
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| Keywords: | Yb Al-Zn-Mg-Cu alloy ytterbium recrystallization fracture characteristics transgranular fracture |
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