Kim Yong-Ho, Yoo Hyo-Sang, Son Hyeon-Taek
Smart Mobility Materials and Components Groups, Korea Institute of Industrial Technology, 1110-9 Oryong-dong, Buk-gu, Gwangju 61012, Republic of Korea.
J Nanosci Nanotechnol. 2021 Sep 1;21(9):4768-4772. doi: 10.1166/jnn.2021.19263.
In this study, microstructure and sintering behaviors of the gas-atomized Al-(25 or 30) Cr-xSi alloy ( = 5, 10 and 20 at.%) during spark plasma sintering (SPS) process were investigated. Gas-atomized alloy powders were manufactured using Ar gas atomizer process. These alloy powders were consolidated using SPS process at different temperature under pressure 60 MPa in vacuum. Microstructures of the gas-atomized powders and sintered alloys were analyzed using scanning electron microscopy (SEM) with energy-dispersive X-ray spectrometer (EDS), and transmission electron microscopy (TEM). Hardness of the SPS sintered alloys was measured using micro Vickers hardness tester. The Al-Cr-Si bulks with high Cr and Si content were produced successfully using SPS sintering process without crack and obtained fully dense specimens close to nearly 100% T. D. (Theoretical Density). The maximum values of the hardness were 834 Hv for the sintered specimen of the gas atomized Al-30Cr-20Si alloy. Enhancement of hardness value was resulted from the formation of the multi-intermetallic compound with the hard and thermally stable phases and fine microstructure by the addition of high Cr and Si.
在本研究中，对气雾化Al-(25或30)Cr-xSi合金（x = 5、10和20原子%）在放电等离子烧结（SPS）过程中的微观结构和烧结行为进行了研究。气雾化合金粉末采用氩气雾化工艺制造。这些合金粉末在真空中60 MPa压力下于不同温度通过SPS工艺进行固结。使用配备能量色散X射线光谱仪（EDS）的扫描电子显微镜（SEM）和透射电子显微镜（TEM）对气雾化粉末和烧结合金的微观结构进行了分析。使用显微维氏硬度测试仪测量SPS烧结合金的硬度。通过SPS烧结工艺成功制备出了具有高Cr和Si含量的Al-Cr-Si块体，无裂纹，并获得了接近理论密度（T.D.）100%的完全致密试样。气雾化Al-30Cr-20Si合金烧结试样的硬度最大值为834 Hv。硬度值的提高源于通过添加高Cr和Si形成了具有硬且热稳定相的多金属间化合物以及精细的微观结构。
