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粉末冶金材料科学与工程  2019, Vol. 24 Issue (2): 112-119    
  工艺技术 本期目录 | 过刊浏览 | 高级检索 |
放电等离子烧结制备7056铝合金的组织与性能
黄兰萍1,2,3, 何军1, 李松1, 陈送义4, 陈康华1,2,4
1. 中南大学 粉末冶金国家重点实验室,长沙 410083;
2. 中南大学 轻质高强结构材料重点实验室,长沙 410083;
3. 常州大学 江苏省材料表面科学与技术重点实验室,常州 213164;
4. 中南大学 轻合金研究院,长沙 410083
Microstructure and mechanical property of 7056 aluminum alloy produced by spark plasma sintering
HUANG Lanping1,2,3, HE Jun1, LI Song1, CHEN Songyi4, CHEN Kanghua1,2,4
1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;
2. Key Laboratory of Lightweight High Strength Structural Materials, Central South University, Changsha 410083, China;
3. Jiangsu Key Laboratory of Materials Surface Science and Technology, Changzhou University, Changzhou, 213164, China;
4. Light Alloy Research Institute, Central South University, Changsha 410083, China
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摘要 采用氮气雾化法制备Zr质量分数为0.25%的7056铝合金粉末,然后通过放电等离子烧结技术制备超高强7056铝合金,研究烧结温度对合金致密性、微观组织和力学性能的影响。结果表明:气雾化法制备的7056铝合金粉末组织为枝晶结构,平均粒度为43.4 μm,晶粒尺寸为1~2 μm,晶界处存在明显的溶质元素偏聚。放电等离子烧结的7056铝合金接近全致密。随烧结温度升高,合金的压缩屈服强度先增大后减小,在烧结温度为480 ℃时,强度最高,为284.7 MPa。经过固溶时效处理后,合金强度显著提高,烧结温度为420 ℃的合金,时效后强度达到575.9 MPa。时效态合金的强度随烧结温度升高而降低。
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黄兰萍
何军
李松
陈送义
陈康华
关键词 7056铝合金雾化制粉放电等离子烧结烧结温度微观组织    
Abstract:The bulk ultra-high strength 7056 aluminum alloys were prepared by spark plasma sintering (SPS) combined with nitrogen atomization process. The effects of sintering temperatures on the density, microstructure and mechanical properties of this consolidated alloy were studied. The results showed that the gas-atomized 7056 aluminum alloy particles of an average of 43.4 μm exhibited a cellular-like dendritic structure with a grain size of about 1-2 μm, obvious solute element segregation was found at grain boundaries. The nearly full dense bulk body could be obtained by spark plasma sintering. It was the yield strength maxium of 284.7 MPa of the consolidated alloy during compression when the sintering temperature was 480 ℃. With the increase of sintering temperature, the yield strength during compression first increased and then decreased. The mechanical properties of the consolidated alloy could be obviously enhanced after solution and aging treatment, the yield strength of alloy was amaxium of 575.9 MPa as sintering temperature was 420 ℃, and gradually decreased with the increase of sintering temperature.
Key words7056 aluminum alloy    gas atomization    spark plasma sintering    sintering temperature    microstructure
收稿日期: 2018-11-01      出版日期: 2019-07-12
ZTFLH:  TF124  
基金资助:国家自然科学基金资助项目(51871245); 湖南省自然科学基金资助项目(2018JJ2504); 国家重点研发计划资助项目(SQ2017YFE0301505); 江苏省材料表面科学与技术重点实验室开放课题基金(KFBM20180002); 装发重点实验室基金(6142912180105); 国家重点研发计划资助项目(2016YFB0300801); 国家自然科学基金重大科研仪器设备研制专项(51327902)
作者简介: 李松,副教授,博士。电话:18684980068;E-mail: ls2011sl@.csu.edu.cn
引用本文:   
黄兰萍, 何军, 李松, 陈送义, 陈康华. 放电等离子烧结制备7056铝合金的组织与性能[J]. 粉末冶金材料科学与工程, 2019, 24(2): 112-119.
HUANG Lanping, HE Jun, LI Song, CHEN Songyi, CHEN Kanghua. Microstructure and mechanical property of 7056 aluminum alloy produced by spark plasma sintering. Materials Science and Engineering of Powder Metallurgy, 2019, 24(2): 112-119.
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