摘要
Nano-AlN and submicron-Al_(2)O_(3) particles were simultaneously utilized in a 6061 Al matrix composite to improve the high-temperature strength.According to the SEM and TEM characterization,nano-AlN and submicron-Al_(2)O_(3) particles are uniformly distributed in the Al matrix.Brinell hardness results indicate that different from the traditional 6061 Al matrix alloy,the aging kinetics of the composite is obviously accelerated by the reinforcement particles.The T6-treated composite exhibits excellent tensile properties at both room temperature and elevated temperature.Especially at 350℃,the T6-treated composite not only has a high yield strength of 121 MPa and ultimate tensile strength of 128 MPa,but also exhibits a large elongation of 11.6%.Different strengthening mechanisms of nano-AlN and submicron-Al_(2)O_(3) particles were also discussed in detail.
为了提高6061铝基复合材料的高温性能,利用纳米AlN和亚微米Al_(2)O_(3)颗粒对其进行强化。由SEM和TEM表征结果可知,纳米AlN和亚微米Al_(2)O_(3)颗粒均弥散分布于铝基体中。布氏硬度测试结果表明,与传统6061铝合金不同,增强体颗粒明显加快了复合材料的时效动力学。经T6热处理的复合材料具有优异的室温和高温拉伸性能。特别是在350℃时,T6态的复合材料不仅具有121 MPa的屈服强度和128 MPa的抗拉强度,而且其伸长率高达11.6%。此外,还详细讨论纳米AlN和亚微米Al_(2)O_(3)颗粒的强化机制。
基金
supported by the Key Program of National Natural Science Foundation of China(No.51731007)
the National Natural Science Foundation of China(No.52071179)
the Fundamental Research Funds for the Central Universities(No.30920021160).
