5A90铝锂合金显微组织及力学性能的研究.doc
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1、5A90铝锂合金显微组织及力学性能的研究Study of the Microstructure and Tensile Properties of 5A90 Aluminum Lithium Alloy FENG Zhao-hui1, LU Zheng1, SU Hai2, YAN Hao2, ZHENG Ying-zhu2, GAO Wen-li2?k (1. Beijing Institute of Aeronautical Materials, Beijing 100095, China; 2. College of Materials Science and Engineering,
2、Hunan Univ, Changsha, Hunan 410082, China) Abstract:The microstructure and tensile properties of 5A90 aluminum-lithium alloy rolled plate after heat treatment were studied with optical microscope, scanning electron microscope and transmission electron microscope. The results showed that the microstr
3、ucture of the as-rolled plate presented anisotropy. Equiaxed grain appeared in the rolling plane. The microstructure in the longitudinal section and cross section presented a rolling streamline. There were a small number of recrystallized grains within the alloy. With the ageing heat treatment at 13
4、0 after the solid solution of 460 /20 min, the hardness of the alloy increased continuously with ageing time until 20 hour peak-ageing, then the hardness dropped slowly. The main precipitate strengthening phase of 5A90 alloy was (Al3Li) phase, and there was a good coherent relationship between phase
5、 and the matrix at peak-ageing. The ultimate tensile strength, yield strength and elongation were 512 MPa, 437 MPa and 7.5%, respectively. The main fracture manner of 5A90 aluminum-lithium alloy was dimple fracture, delamination cracking and cracking along the sub-boundaries. Tensile fracture surfac
6、es showed the mixed characteristics of ductile fracture and brittle fracture. Key words: 5A90 aluminum-lithium alloy; aging heat treatment; microstructure ? 铝锂合金具有低的密度、高的比强度和高的比刚度、优良的耐热性能以及卓越的超塑成形性等优点,用其代替常规铝合金,可使结构件质量减轻10%15%,刚度提高15%20,是一种理想的轻质高强结构材料,在航空、航天领域得到了广泛的应用1.作为飞机的主要结构材料,用于提高飞机结构效率、减轻飞机机身重
7、量、改进飞机性能,潜在经济效益极大,被认为是21世纪飞行器的主要结构材料2-3.发达国家在铝锂合金的研究、生产及应用等方面都取得了巨大发展.目前,国外有20多种铝锂合金的生产已达到工业化水平.美、欧等国已能生产重620 t的铸锭,而俄罗斯则已具备生产重25 t铸锭的能力.美、欧、俄等国在铝锂合金的轧制、挤压、锻造等方面的生产技术水平已接近常规铝合金.特别是20世纪90年代,第二代铝锂合金2094,2095,2097,2195,2197,1460等合金的研制成功为其应用提供了更为广阔的前景4-6.5A90铝锂合金属于Al-Mg-Li系合金,是目前国产最轻的商业铝合金.与其它铝锂合金相比,其密度更
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- A90 合金 显微 组织 力学性能 研究
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