文章信息/Info

Title:

Microstructure and Wear Resistance of In-Situ Synthesized AlB2/6061 Composites

文章編號:

1674-3962(2021)08-0626-05

作者:

莊偉彬; 孫蕊; 滿生博; 王筱智; 劉廣柱; 劉敬福

（遼寧工程技術(shù)大學(xué)材料科學(xué)與工程學(xué)院，遼寧 阜新 123000）

Author(s):

ZHUANG Weibin;  SUN Rui;  MAN Shengbo;  WANG Xiaozhi;  LIU Guangzhu;  LIU Jingfu

(School of Materials Science and Engineering, Liaoning Technical University, Fuxin 123000, China)

關(guān)鍵詞:

鋁基復(fù)合材料; 原位自生; AlB2顆粒; 顯微組織; 耐磨性能

Keywords:

aluminum matrix composites;  in-situ synthesis;  AlB2 particles;  microstructure;  wear resistance

分類號:

TB331

DOI:

10.7502/j.issn.1674-3962.202005034

文獻標(biāo)志碼:

A

摘要:

以Al-KBF4為反應(yīng)體系，采用熔鹽反應(yīng)法制備了原位自生3% AlB2/6061復(fù)合材料（質(zhì)量分?jǐn)?shù)），對比6061基體材料，研究了AlB2顆粒對復(fù)合材料組織、硬度和耐磨性能的影響。結(jié)果表明，在6061基體材料中原位自生了六邊形AlB2顆粒，顆粒尺寸為0.5～2.0 μm。經(jīng)T6熱處理后，3% AlB2/6061復(fù)合材料的硬度為HB 119.1，較6061基體提高了26.57%。復(fù)合材料比磨損率為1.83×10-8 kg·N-1·m-1，較6061基體下降了17.94%。AlB2顆粒與基體材料之間的潤濕性好，界面結(jié)合強度高，且其本身硬度高，在磨損時能夠起到承載作用，有效地減少了復(fù)合材料與對磨材料間的接觸面積，提高了復(fù)合材料的耐磨性。復(fù)合材料的磨損機制主要為磨粒磨損和粘著磨損，其平均摩擦系數(shù)為0.235，相較于6061基體材料降低了17.54%。

Abstract:

3wt% AlB2/6061 composites were in-situ synthesized by molten salt method using Al-KBF4 as reaction system. Compared with 6061 matrix, effects of AlB2 particles on the hardness and wear resistance of the composites were studied. The results show that regular hexagonal AlB2 particles with the size of 0.5~2.0 μm can be directly in-situ synthesized in 6061 matrix. After T6 heat treatment, the hardness of 3wt%AlB2/6061 composites is HB 119.1, which is 26��57% higher than that of 6061 matrix. The specific wear rate of the composites is 1.83×10-8 kg·N-1·m-1, which is 17.94% lower than that of 6061 matrix. Due to good enough wettability and high interface bonding strength between AlB2 particles and the matrix, and high hardness of the particles, the particles can play a bearing role, then reduce the contact area between the composites and the wear-resistant material during wear, thus wear resistance of the composites is improved. The wear mechanism of the composites is mainly abrasive wear and adhesive wear. The average friction coefficient of the composites is 0.235, which is 17.54% lower than that of 6061 matrix.