Transactions of Materials and Heat Treatment

Title：Influence of solid solution and two\|stage aging on microstructure and  properties for backward extrustion 2A12 aluminum alloy

Authors：

Unit：

KeyWords：

ClassificationCode：TG166.3;TG146.21

year,vol(issue):pagenumber：2020,45(1):179-185

Abstract：

For 2A12 aluminum alloy prepared by the backward extrusion process in different solid solution plus two\|stage aging (T6) treatment, the relationship between microstructure and mechanical properties of samples before and after treatment under different conditions was observed and analyzed by optical microscopy (OM), scanning electron microscopy (SEM), energy spectrum analysis, X\|ray diffraction (XRD) and universal tensile testing machines at normal temperature. The results show that at different solid solution temperatures, the grain size of 505 ℃×1 h is fine, the dispersed phase is arranged along the grain boundary sequence, the residual eutectic phase is well dissolved, and the mechanical properties are good. Then, the influences of two\|stage aging temperature and time on the microstructure and properties of the alloy were studied. The tensile strength of 450.5 MPa is the highest at 100 ℃×2 h+200 ℃×5 h with the elongation of 14%. Furthermore, a large number of strengthening phase θ[DK](Al2Cu) and nano-S phase (Al2CuMg) are precipitated in the crystal, and the T phase (Al20Cu2Mn3) which is difficult to dissolve with temperature and time is dispersedly distributed.

Funds：

山西省自然科学基金资助项目（201801D121106）

作者简介：闫凡（1993-），女，硕士研究生 E-mail：1226026333@qq.com 通讯作者：徐健（1987-），男，博士，讲师 E-mail：812210984@qq.com

Reference：

[1]桂奇文.热处理工艺对2024铝合金析出相及性能的影响[D].长沙：湖南大学,2012.

Gui Q W. Effect of Heat Treatment Process on Precipitates and Properties of 2024 Aluminum Alloy [D]. Changsha: Hunan University, 2012.

[2]李晗.2024铝合金薄板的热处理工艺与性能的研究[D].西安：西北工业大学,2007.

Li H. Study on Heat Treatment Process and Properties of 2024 Aluminum Alloy Sheet [D]. Xi′an: Northwestern Polytechnical University, 2007.

[3]陈刚,高平平,范才河,等.热处理对挤压铸造2024铝合金组织与性能的影响[J].湖南大学学报:自然科学版,2010,37(5):74-77.

Chen G, Gao P P, Fan C H, et al. Effect of heat treatment on microstructure and properties of squeeze casting 2024 aluminum alloy [J]. Journal of Hunan University: Natural Science Edition, 2010, 37(5):74-77.

[4]李小俊,张惠敏.铝合金铸件分级时效工艺研究[J].中国铸造装备与技术,2000,(3):27-28.

Li X J, Zhang H M. Study on graded sging process of aluminum alloy castings[J]. China Foundry Equipment and Technology, 2000, (3):27-28.

[5]甄良,孙东立,崔约贤,等.2091Al|Li合金的分级时效工艺[J].中国有色金属学报,1993,3(4):72-76.

Zhen L, Sun D L, Cui Y X, et al. Graded aging process of 2091Al-Li alloy[J]. Journal of Chinese Nonferrous Metals,1993,3(4):72-76.

[6]刘北兴,覃耀春,李仁顺.分级时效工艺对1420Al-Li合金组织与性能的影响[J].宇航材料工艺,2001, (3):49-51,59.

Liu B X, Qin Y C, Li R S. Effect of graded aging process on microstructure and properties of 1420Al-Li alloy[J].Aerospace Materials Technology,2001,(3):49-51,59.

[7]邵华,刘兆晶,刘君,等.分级时效和冷热循环对2024铝合金微塑变抗力的影响[J].中国有色金属学报,2000,10(3):330-333.

Shao H, Liu Z J, Liu J, et al. Effect of graded aging and hot and cold cycle on microplastic resilience of 2024 aluminum alloy[J]. Journal of Chinese Nonferrous Metals, 2000, 10 (3): 330-333.

[8]李铁成,张世兴.形变热处理工艺对2A16铝合金挤压棒显微组织及性能的影响[J].轻合金加工技术,2011,39(6):43-46.

Li T C, Zhang S X. Effect of deformation heat treatment on microstructure and properties of 2A16 aluminum alloy extruded rod[J]. Light Alloy Processing Technology,2011,39(6):43-46.

[9]万明珍,张在强,吕鹏,等.热循环作用下2A12铝合金的微观结构与性能[J].中国有色金属学报,2013,23(4):939-943.

Wan M Z, Zhang Z Q, Lyu P, et al. Microstructure and properties of 2A12 aluminum alloy under thermal cycling[J].Journal of Chinese Nonferrous Metals, 2013,23(4):939-943.

[10]尚勇,张立武.重固溶再双级时效处理对7175铝合金力学性能和微观组织的影响[J].固体火箭技术,2006,(3):225-228.

Shang Y, Zhang L W. Effect of re|solid solution and double|stage aging treatment on mechanical properties and microstructure of 7175 aluminum alloy[J]. Solid Rocket Technology, 2006 ,(3):225-228.

[11]刘春燕,邱义伦,李昌安.影响2A14铝合金锻件力学性能的因素[J].热处理,2009,24(6):46-48.

Liu C Y, Qiu Y L, Li C A. Factors affecting mechanical properties of 2A14 aluminum alloy forgings[J]. Heat Treatment,2009,24(6): 46-48.

[12]李润霞,李荣德,吕伟，等.固溶处理对铸造Al-Si-Cu-Mg合金组织与性能的影响[J].中国有色金属学报,2007,17(2):193-199.

Li R X, Li R D, Lyu W, et al. Effect of solution treatment on microstructure and properties of cast Al-Si-Cu-Mg alloy[J].Journal of Chinese Nonferrous Metals,2007, 17 (2):193-199.

[13]刘程.新型热处理工艺对变形铝合金组织及性能的影响[D]. 合肥：合肥工业大学,2012.

Liu C. Effect of New Heat Treatment Process on Microstructure and Properties of Deformed Aluminum Alloy [D]. Hefei: Hefei University of Technology, 2012.

[14]石悦.2024铝合金变形及热处理过程中组织演变及性能研究[D]. 哈尔滨:哈尔滨工业大学,2013.

Shi Y. Study on Microstructure Evolution and Properties of 2024 Aluminum Alloy During Deformation and Heat Treatment[D]. Harbi: Harbin Institute of Technology,2013.

Service：

【This site has not yet opened Download Service】【Add Favorite】