对AZ91镁合金在均质化热处理、热挤压和时效处理中的组织演化规律进行研究.研究结果表明,在铸态组织中存在离异共晶和固态析出两种β-Mg17Al12相.在最佳的均质化处理(380℃,15 h)过程中,β-Mg17Al12相大部分溶解到α-Mg基体中,并且晶粒细小.在热挤压过程中发生动态再结晶以及由此产生的晶粒细化.而时效处理之后则出现平行于挤压方向的带状β-Mg17Al12相析出,这应该是由于在挤压过程中把原始铸造偏析挤扁拉长而造成的.另外,根据实验结果,详细地讨论了均质化和时效处理的温度、保温时间以及挤压工艺参数对AZ91镁合金的组织变化产生的影响.
Microstructural evolution of AZ91 magnesium alloy was investigated during homogenizing annealing treatment,hot extrusion and ageing treatment,respectively.The results exhibited that both the divorced eutectic β-Mg17Al12 and the precipitated β-Mg17Al12 phases appeared in the as-cast alloy.The β-Mg17Al12 phase dissolved into a-Mg matrix mostly and the structure kept fine after the optimized homogenization treatment at 380 ℃ for 15 h.Dynamic recrystallization and consequent grain refinement occurred during extrusion.The banded β-Mg17Al12 precipitates paralleled to the extrusion direction were observed after ageing treatment.The banded precipitation should be attributed to the solidification segregation which was elongated during the subsequent extrusion.Furthermore,the effects of temperature,holding time of homogenization and ageing treatment,and extrusion processing parameters on the microstructural evolution of AZ91 alloy were also discussed in details according to the experimental results.
参考文献
| [1] | MAHALLAWY N A;SHOEIB M A;ABOUELENAIN M H .AZ91magnesium alloys:Anodizing of using environmental friendly electrolytes[J].Journal of Surface Engineered Materials and Advanced Technology,2011,1(02):62-72. |
| [2] | ZHAO Hong-liang,ZHOU Zhan-xia,LIU Xu-dong,GUAN Shao-kang.Influence of Mg2N2 powder on microstructures and mechanical properties of AZ31 Mg alloy[J].中南工业大学学报（英文版）,2008(04):459-462. |
| [3] | Abdel-Wahab El-Morsy;A. Abouel-Kasem .Tribological Characteristics of Deformed Magnesium Alloy AZ61 Under Dry Conditions[J].Journal of Tribology,2011(4):041603-1-041603-8. |
| [4] | YU Man-ye;LIN Ying.Finite element analysis of magnesium alloy automobile engine cylinder cover[J].Machinery Design and Manufacture,2010(10):75-77. |
| [5] | 徐关庆,赵晓宏,付蓉,高宏伟.镁合金汽车零件表面处理技术研究[J].汽车工艺与材料,2004(07):57-59. |
| [6] | UEMATSU Y;TOKAJI K;FUJIWARA K;TOZAKI Y .Fatigue behaviour of cast magnesium alloy AZ91 microstrncturally modified by friction stir processing[J].Fatigue & Fracture of Engineering Material & Structure,2009,32(07):541-551. |
| [7] | Yosuke Harai;Masaaki Kai;Kenji Kaneko;Zenji Horita;Terence G. Langdon .Microstructural and Mechanical Characteristics of AZ61 Magnesium Alloy Processed by High-Pressure Torsion[J].Materials transactions,2008(1):76-83. |
| [8] | CIZEK L;GREGER M;PAWLICA L;DOBRZANSKI LA TANSKI T .Study of selected properties of magnesium alloy AZ9l after heat treatment and forming[J].Journal of Materials Processing Technology,2004,157-158:466-471. |
| [9] | Koji Aoyama;Mitsuaki Furui;Susumu Ikeno.Microstructure Evolution in AZ31 Magnesium Alloy Worked by Torsion at Warm Temperature[J].Materials Science Forum,2010:727-730. |
| [10] | 胡红军,张丁非,杨明波,邓明.应用挤压-剪切大变形工艺细化AZ31镁合金晶粒[J].中国有色金属学报（英文版）,2011(02):243-249. |
| [11] | HSIANG Su-hai;LIN Yi-wei;LAI Hong-wei.Optimization of hot extrusion process for AZ61 magnesium alloy oarriers[J].International Journal of Material Forming,2011(04):1-10. |
| [12] | Manuel Marya;Louis G. Hector;Ravi Verma .Microstructural effects of AZ31 magnesium alloy on its tensile deformation and failure behaviors[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2006(1/2):341-356. |
| [13] | Su-Hai Hsiang;Jer-Liang Kuo .An investigation on the hot extrusion process of magnesium alloy sheet[J].Journal of Materials Processing Technology,2003(1/3):6-12. |
| [14] | YU Kun,CAI Zhi-yong,WANG Xiao-yan,SHI Ti,LI Wen-xian.Constitutive analysis ofAZ31 magnesium alloy plate[J].中南大学学报（英文版）,2010(01):7-12. |
| [15] | NODA M;MORI H;FUNAMI K.Transition in deformation mechanism of AZ31 magnesium alloy during high-temperature tensile deformation[J].Journal of Metallurgy,2011(10):1-10. |
| [16] | Kim, W.C.;Nam, N.D.;Kim, J.G.;Lee, J.I. .Effect of strontium on corrosion properties of AZ91 magnesium alloy[J].Electrochemical and solid-state letters,2011(11):C21-C24. |
| [17] | Liqun Ruan .Dynamic Forming of AZ91 Magnesium Alloy Using Explosive Energy[J].Materials Science Forum,2011(TN.673):297-300. |
| [18] | 金军兵,王智祥,刘雪峰,谢建新.均匀化处理对AZ91镁合金组织和力学性能的影响[J].金属学报,2006(10):1014-1018. |
| [19] | DAHLE A K;LEE Y C;NAVE M D;SCHAFFER P L STJOHN D H .Development of the as-cast microstructure in magnesium-aluminum alloys[J].Journal of Light Metals,2001,1(01):61-72. |
| [20] | MOSS M;LAPOVOK R;BETTLES C J .The equal channel angular pressing of magnesium and magnesium alloy xowders[J].Journal of the Minerals,Metals & Materials Society,2007,59(08):54-57. |
| [21] | SMIRNOVA N A;LEVIT V I;PILYUGIN V I .Evolution of structure of FCC singie crystals during strong plastic deformation[J].Physics of Metals and Metallography,1986,61(06):127-134. |
| [22] | Ya Zhang;Xiaoqing Zeng;Chen Lu;Wenjiang Ding .Deformation behavior and dynamic recrystallization of a Mg-Zn-Y-Zr alloy[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2006(1/2):91-97. |
| [23] | Wu X;Tao N;Hong Y;Liu G;Xu B;Lu J;Lu K .Strain-induced grain refinement of cobalt during surface mechanical attrition treatment[J].Acta materialia,2005(3):681-691. |
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