Microstructural Characterization and Mechanical Property of Al-Li Plate Produced by Centrifugal Casting Method

被引:4
|
作者
Tian, Qingle [1 ]
Deng, Kai [1 ]
Xu, Zhishuai [1 ]
Han, Ke [2 ]
Zheng, Hongxing [1 ]
机构
[1] Shanghai Univ, Sch Mat Sci & Engn, Shanghai 200444, Peoples R China
[2] Florida State Univ, Natl High Magnet Field Lab, Tallahassee, FL 32310 USA
基金
美国国家科学基金会; 中国国家自然科学基金;
关键词
Al-Li alloy; centrifugal casting; microstructure; mechanical property; TENSILE PROPERTIES; CU; ALLOYS; EVOLUTION; DEFORMATION; PRECIPITATE; COMPOSITE; CORROSION; AEROSPACE; BEHAVIOR;
D O I
10.3390/met11060966
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Using a centrifugal casting method, along with deformation and aging, we produced a high-strength, low-anisotropy Al-Li plate. The electron probe microanalysis, transmission electron microscope, differential scanning calorimetry, and X-ray diffraction were used to clarify the evolution of strengthening phases. Experimental results showed that centrifugal-cast Al-Li plate consisted of intragrain delta '-(Al,Cu)(3)Li precipitate and interdendritic theta '-Al2Cu particles. After cold-rolling to a reduction ratio of 60% and annealing at 800 K for 90 min, both primary theta ' and delta ' were dissolved in solid solution. Aging at 438 K for 60 h led to the formation of two kinds of precipitates (needle-like T-1-Al2CuLi and spherical delta ' in two sizes), which acted as the main strengthening phases. The average values of ultimate tensile strength and yield strength for the anneal-aged plate reached 496 MPa and 408 MPa, with a total elongation of 3.9%. The anneal-aged plate showed mechanical anisotropy of less than 5%. The tensile fracture morphology indicated a typical intergranular fracture mode.
引用
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页数:10
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