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基于6082Al-K_2ZrF_6-KBF_4体系,通过熔体直接反应法制备原位纳米3wt%ZrB_2/6082Al复合材料,并在300℃下对其进行累积叠轧(ARB),获得了纳米相均匀分布的高性能铝基复合材料。OM、XRD、SEM和TEM分析表明,纳米增强体团簇被打碎,并随着道次的增加分布越来越均匀;其中析出相,比如Fe-Mn-Si相,也随着道次的增加逐渐被打碎并细化;复合材料的晶粒同时被极大地细化,经过9道次ARB,晶粒平均尺寸达到380 nm。拉伸试验表明,复合材料抗拉强度随着道次增加逐渐增大,最大为310 MPa,伸长率为15.8%,与6082Al基体相比,分别提高了138.5%和66.3%。
Based on the 6082Al-K_2ZrF_6-KBF_4 system, in-situ nano 3wt% ZrB 2 / 6082Al composites were prepared by the melt direct reaction method and were subjected to the ARB at 300 ℃ to obtain high performance nano-phase uniformly distributed Aluminum matrix composites. The results of OM, XRD, SEM and TEM show that the clusters of nanosize reinforcements are broken up and distribute more and more uniformly along with the increase of pass. The precipitation phase, such as Fe-Mn-Si phase, Increasing gradually smashed and refined; the composite grain is greatly refined at the same time, after 9 times ARB, the average grain size of 380 nm. Tensile tests show that the tensile strength of the composites increases with the increase of pass, the maximum is 310 MPa and the elongation is 15.8%, which is increased by 138.5% and 66.3% respectively compared with the 6082Al matrix.