Song Panying, Xie Kun, Yang Junrui, Jiang Dandan, Liu Zhongxia, Zhang Jianming, Zhang Guopeng, Cai Bin
Key Laboratory of Material Physics, Ministry of Education, School of Physics and Microelectronics, Zhengzhou University, Zhengzhou, Henan Province 450052, China.
School of Materials Science and Engineering, Luoyang Institute of Science and Technology, Luoyang 471023, China.
Micron. 2022 Jun;157:103245. doi: 10.1016/j.micron.2022.103245. Epub 2022 Mar 17.
In this study, ZrMgMoO/Al-40Si (ZMMO/Al-40Si) composites with 15 wt% ZrMgMoO were fabricated by ball milling-vacuum hot pressing (VHP) processes. The effect of ball milling processes on the microstructure, compressive properties and coefficient of thermal expansion (CTE) of the composites were investigated. It is found that ball milling treatments of mixed ZMMO/Al-40Si powders refine the particles of ZMMO reinforcements and primary Si in ZMMO/Al-40Si composites and improve the distribution of ZMMO reinforcements in α-Al matrix, resulting in the increase of the compressive strength and the decrease of the CTE of ZMMO/Al-40Si composites. The highest compressive yield strength of 430.82 MPa and the lowest CTEs of 5.8 × 10/°C (RT - 400 °C) are obtained after ball milling for 8 h at 250 rpm, increasing by 145.9% and decreasing by 61.3% respectively compared with the compressive yield strength and CTE of Al-40Si alloy. Among the reinforcements commonly used in aluminum matrix composites, ZMMO reinforcement has the highest reduction efficiency for CTE of ZMMO/Al-40Si composite. The application of high-energy ball milling to refine the microstructure is a promising method that can simultaneously increase the strength and reduce the CTEs of ZMMO/Al-40Si composites.
在本研究中，通过球磨-真空热压（VHP）工艺制备了含有15 wt% ZrMgMoO的ZrMgMoO/Al-40Si（ZMMO/Al-40Si）复合材料。研究了球磨工艺对复合材料微观结构、压缩性能和热膨胀系数（CTE）的影响。结果发现，对ZMMO/Al-40Si混合粉末进行球磨处理可细化ZMMO/Al-40Si复合材料中ZMMO增强体和初生Si的颗粒，并改善ZMMO增强体在α-Al基体中的分布，从而导致ZMMO/Al-40Si复合材料的抗压强度增加以及CTE降低。在250 rpm下球磨8 h后，获得了最高抗压屈服强度430.82 MPa和最低CTE值5.8×10⁻⁶/°C（室温-400 °C），与Al-40Si合金的抗压屈服强度和CTE相比，分别提高了145.9%和降低了61.3%。在铝基复合材料常用的增强体中，ZMMO增强体对ZMMO/Al-40Si复合材料CTE的降低效率最高。应用高能球磨细化微观结构是一种有前景的方法，可同时提高ZMMO/Al-40Si复合材料的强度并降低其CTE。
