本研究使用 AZ91D 鎂合金作為基材，Al0.5CoCrFeNi2 高熵合金粉末 (粉末粒徑為 10 ~ 60 μm) 以及 SiC 陶瓷粉末 (粉末粒徑為 38 μm) 作為強化相，並以熱壓製程與火花電漿燒結製程，兩種不同的粉末冶金製程製造鎂基複合材料。在 AZ91D 合金中分別摻雜 10 wt.% 高熵合金粉末以及 10 wt.% SiC 陶瓷粉末，並探討摻雜不同的強化相對鎂基複合材料之影響以及不同製程對鎂基複合材料之影響。
結果顯示，鎂基複合材料之基底組成均為 α-Mg、富 Al 相或 Mg17Al12。相較於熱壓製程，火花電漿燒結製程能夠有效地降低材料的孔隙率，AZ91 由 12.6 % 降低至 8.5%；AZ91-Al0.5CoCrFeNi2 由 6.3 % 降低至 4.9 %；AZ91-SiC 由11.1 % 降低至 7.4%。硬度結果表明，摻雜強化相均有提升硬度的效果。壓縮試驗結果表明，熱壓燒結錠的極限抗壓強度由 464.4 MPa 提升至 492.0 MPa，應變量由 12.1 % 提升至 13.5 %；火花電漿燒結錠的極限抗壓強度由 484.3 MPa 提升至 501.4 MPa，應變量由 12.2 % 提升至 13.7 %。結果表明火花電漿製程之 AZ91-Al0.5CoCrFeNi2 有最佳的機械性質。

In this study, magnesium-based metal matrix composites (MMCs), in which AZ91D alloy was as the substrate, and Al0.5CoCrFeNi2 high entropy alloy (HEA) powder (particle size of 10 ~ 60 μm) and SiC ceramic powder (particle size of 38 μm) were used as the reinforcement phases, were prepared by two different powder metallurgy manufacturing, including hot pressing (HP) and spark plasma sintering (SPS). The amount of HEA powder and SiC powder in the MMCs is 10 wt.%. The effects of reinforcement phase and processing on the properties of magnesium-based MMCs were studied.
The results show that α-Mg, Al-rich phase or Mg17Al12 can be found in all of the magnesium-based composites. Compared to the hot pressing process, the SPS process can reduce the porosity of the material effectively. After SPS process, porosity of AZ91 is reduced from 12.6% to 8.5%. Porosity of AZ91-Al0.5CoCrFeNi2 is reduced from 6.3% to 4.9%, and porosity of AZ91-SiC is reduced from 11.1% to 7.4 %. The hardness increases when the reinforcement phase is introduced. The Ultimate compression strength (U.C.S.) of the HP sample increases from 464.4 MPa to 492 MPa, and the strain increases from 12.9% to 13.1%. The U.C.S. of the SPS sample increases from 484.3 MPa to 501.4 MPa, and the strain increases from 12.2% to 13.7%. The results indicate that AZ91-Al0.5CoCrFeNi2 prepared by spark plasma process has the superior mechanical properties

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