利用喷射共沉积-热挤压-轧制工艺制备SiC_p/2024复合材料板材.研究该复合材料轧板热处理后的显微组织及力学性能,并确定其最佳的热处理工艺条件.结果表明:轧制态复合材料组织细小均匀,晶粒尺寸为3～4 μm,SiC颗粒均匀分布在基体合金中;采用490 ℃、1 h固溶处理和170 ℃、8 h时效后,SiC_p/2024复合材料轧板的抗拉强度、屈服强度和伸长率分别为480 MPa、358 MPa和6.4%,基体合金中存在大量细小的第二相颗粒,为Al_2MgCu及Al_2Cu相;峰时效状态时复合材料的布氏硬度值为228 HB,与轧板原始硬度相比较增幅达130%;喷射共沉积SiC_p/2024复合材料轧板到达峰时效时间比铸造2024铝合金的短,这主要是因为喷射沉积基体合金内细小均匀的晶粒组织、基体合金内高密度的位错组态以及SiC颗粒的引入,均有利于沉淀相的提前析出.
SiC_p/2024 aluminum matrix composite sheets were fabricated by spray co-deposition, rolling and hot extrusion process. The microstructures and mechanical properties of the as-rolled composite sheets after heat treatment were investigated, and the optimum heat treatment process was determined. The results show that the fine and homogeneous grain structure is obtained in the as-rolled composite, the grains size is 3-4 μm, and the SiC particles distribute uniformly in the alloy matrix. Under the condition of 490 ℃, 1 h solid solution and 170 ℃, 8 h peak-aging heat treatment, the ultimate tensile strength, yield strength and elongation of the as-rolled composite sheets are 480 MPa, 358 MPa and 6.4%, respectively. There is a large amount of small precipitate strengthening phases in the alloy matrix at this stage, which are mainly Al_2CuMg and CuAl_2 phases. The Brinell hardness of as peak-aged composite is 228 HB, increased by 130% when compared with that of the original hardness. Compared with the as-cast 2024 aluminum alloy, the time required to achieve the peak aging for spray co-deposited SiC_p/2024 composite is shorter, because the fine and homogeneous grain structures induced by the spray deposition increase dislocation density in the as-rolled composite after large deformation and the addition of SiC particles is advantageous for the precipitation of deposition phases.
参考文献
| [1] | Shyong JH.;Derby B. .THE DEFORMATION CHARACTERISTICS OF SIC PARTICULATE-REINFORCED ALUMINIUM ALLOY 6061[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,1995(1):11-18. |
| [2] | LENGSFELD P;JUAREZ-ISLAS J A;CASSADA W A .Microstructure and mechanical behavior of spray deposited Zn modified 7××× series Al alloys[J].International Journal of Rapid Solidification,1995,8(04):237-265. |
| [3] | Srivatsan TS.;Al-Hajri M.;Smith C.;Petraroli M. .The tensile response and fracture behavior of 2009 aluminum alloy metal matrix composite[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2003(1/2):91-100. |
| [4] | 袁广江,章文峰,王殿斌,桂满昌,吴洁君.SiC颗粒增强铝基复合材料制备及机加性能研究[J].复合材料学报,2000(02):38-41. |
| [5] | 乐永康,王哲,王恩泽,孙建科,张迎元.颗粒增强铝基复合材料6066Al/SiCp的时效析出特性[J].稀有金属材料与工程,2002(06):460-463. |
| [6] | Badini C.;Verne E.;Marino F. .CALORIMETRIC STUDY ON PRECIPITATION PATH IN 2024 ALLOY AND ITS SIC COMPOSITE[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,1995(1/2):185-191. |
| [7] | 刘志义,李云涛,刘延斌,夏卿坤.Al-Cu-Mg-Ag合金析出相的研究进展[J].中国有色金属学报,2007(12):1905-1915. |
| [8] | 姜龙涛,赵敏,武高辉,张强.亚微米级Al2O3P/2024Al复合材料的时效行为[J].稀有金属材料与工程,2006(12):1869-1873. |
| [9] | LI Wei;FAN Hong-yuan;LONG Jian-ping;SHEN Bao-luo GAO Sheng-ji TU Ming-jing .Study on suppression and Acceleration of ageing precipitation reaction in Al-Cu alloys[J].Rare Metal Materlals and Engineering,2003,10(32):787-791. |
| [10] | BEKHEET N E;GADELRAB R M;SALAH M F;ABDEIAZIM A N .The effects ageing on the hardness and fatigues behavior of 2024Al alloy/SiC composites[J].Materials & Design,2002,23(02):153-158. |
| [11] | 赵刚,李洪晓,刘春明,郭亚萍.2014铝合金的形变时效处理[J].东北大学学报(自然科学版),2001(06):664-667. |
| [12] | 徐海燕,张福全,吴有伍.7075/SiCp复合材料薄板的热处理工艺研究[J].矿冶工程,2004(04):76-78. |
| [13] | NING Ai-lin,LIU Zhi-yi,ZENG Su-min.Effect of large cold deformation on characteristics of age-strengthening of 2024 aluminum alloys[J].中国有色金属学会会刊（英文版）,2006(05):1121-1128. |
| [14] | REDMILOVIC V;THAMAS G .Microstructure of α-Al base matrix and SiC Particulate composites[J].Materials Science and Engineering A:Structural Materials Properties Microstructure and Processing,1991,32(08):171-179. |
| [15] | 李晗,张建国,席守谋.热处理工艺对2024铝合金薄板力学性能的影响[J].热加工工艺,2007(04):55-57. |
| [16] | A. Albiter;C. A. Leon;R. A. L. Drew;E. Bedolla .Microstructure and heat-treatment response of Al-2024/TiC composites[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2000(1/2):109-115. |
| [17] | Pal, S;Mitra, R;Bhanuprasad, VV .Aging behaviour of Al-Cu-Mg alloy-SiC composites[J].Materials Science & Engineering. A, Structural Materials: Properties, Microstructure and Processing,2008(1-2):496-505. |
| [18] | Karabi Das;L.K. Narnaware .Synthesis and characterization of Al-4.5% Cu/Al3Ti composites: Microstructure and ageing behaviors[J].Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing,2008(1/2):25-30. |
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