锻压技术

ECAP变形过程中MWCNTs/AZ31复合材料的织构演变

英文标题：Texture evolution of MWCNTs/AZ31 composite during ECAP

作者：周国华曾效舒余志核刘焱彭路南

单位：宜春学院南昌大学

分类号：TB333；TG379

出版年,卷(期):页码：2011,36(6):120-124

摘要：

采用等径角挤压变形工艺对经热挤压后的MWCNTs/AZ31复合材料进行不同道次的深度塑性变形。测试和分析了复合材料的室温力学性能，并利用X射线衍射仪对复合材料织构的演变进行了分析。研究结果表明：MWCNTs/AZ31复合材料经热挤压后具有较强的{0001}基面纤维织构，随着等径角挤压变形道次的增加，逐渐偏离挤压态的纤维织构分布，并且织构强度也逐渐减弱。MWCNTs/AZ31复合材料的室温力学性能受复合材料晶粒组织大小、织构分布等因素的综合影响。

Multi-Walled Carbon Nonotubes(MWCNTs)/AZ31 composite was prepared for severe plastic deformation by means of equal channel angular pressing (ECAP) deformation process after hot extrusion. The mechanical properties were tested at room temperature. The texture evolution of composites was investigated by X-ray diffractometer (XRD) during ECAP. The results show that the MWCNTs/AZ31 composite has a strong {0001} fiber texture after hot extrusion. The distribution of texture gradually deviates from fiber texture with the increase of ECAP pass number, and the texture intensity gradually weakens. The grain size and texture together have an important role on the mechanical properties of MWCNTs/ AZ31 alloy composites at room temperature after ECAP.

基金项目：

江西省教育厅科技项目（GJJ09027)

参考文献：

[1]常丽丽. 变形镁合金AZ31的织构演变与力学性能[D]. 大连：大连理工大学, 2009.

[2]王丽娜, 杨平, 夏伟军, 等. 特殊成形工艺下AZ31镁合金的织构及变形机制[J]. 金属学报, 2009, 45(1): 58-62.

[3]Del Valle J A, Ruano O A. Influence of texture on dynamic recrystallization and deformation mechanisms in rolled or ECAPed AZ31 magnesium alloy[J]. Materials Science and Engineering A, 2008, 487(12): 473-480.

[4]陈振华, 夏伟军, 程永奇, 等. 镁合金的织构与各向异性[J]. 中国有色金属学报, 2005, 15(1): 1-11.

[5]Mukai T, Yamanoi M, Watanabe H, et al. Ductility enhancement in AZ31 magnesium alloy by controlling its grain structure[J]. Scripta Materialia, 2001, 45: 89-94.

[6]Kim W J, Hong S I, Kim Y S, et al. Texture development and its effect on mechanical properties of an AZ61 mg alloy fabricated by equal channel angular pressing[J]. Acta Materialia, 2003, 51(11): 3293-3307.

[7]靳丽. 等通道角挤压变形镁合金微观组织与力学性能研究[D]. 上海: 上海交通大学, 2006.

[8]徐强, 曾效舒, 周国华. 钟罩浸块铸造法制备的CNTs/AZ31镁基复合材料的力学性能[J]. 中国有色金属学报, 2010, 20(2):189-194.

[9]周国华.碳纳米管/AZ31镁基复合材料的制备与等径角挤压研究[D]. 南昌: 南昌大学, 2010.

[10]周国华, 曾效舒, 徐强. 等径角挤压制备超细晶CNTs/AZ31镁基复合材料研究[J]. 锻压技术, 2009, 34(2):106-109.

[11]周国华, 曾效舒, 张湛, 等. 挤压温度对等径角挤压碳纳米管增强AZ31镁基复合材料显微组织的影响[J]. 材料工程, 2009, 316(9):20-23.

[12]Figueiredo R B, Beyerlein I J, Zhilyaev A P. Evolution of texture in a magnesium alloy processed by ECAP through die with different angles[J]. Materials Science and Engineering A, 2010, 527: 1709-1718.

[13]Zhou Guohua, Zeng Xiaoshu, Xu Qiang. Microstructure evolution and mechanical behavior of CNTs/AZ31 magnesium alloy composites processed by equal channel angular pressing[J]. Advanced Materials Research，2010, 97101: 1628-1632.

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