(華南理工大學(xué) 廣東省金屬新材料制備與成形重點實驗室，廣州 510640)
摘 要: 采用“機械合金化(MA)+放電等離子燒結(jié)(SPS)”的方法制備出Fe28Ni28Mn28Cr8Cu8和Fe28Ni28Mn28Cr8Al8兩種高熵合金塊體，并研究其微觀組織和力學(xué)性能。結(jié)果表明：兩種高熵合金均在機械合金化后形成了FCC+BCC相的合金粉末。與Fe28Ni28Mn28Cr8Cu8合金相比較，當(dāng)Cu元素被Al元素取代之后，F(xiàn)e28Ni28Mn28Cr8Al8高熵合金粉末中BCC結(jié)構(gòu)的固溶體相含量明顯增加。經(jīng)SPS燒結(jié)后，F(xiàn)e28Ni28Mn28Cr8Cu8由單相FCC和少量富Cr相組成；Fe28Ni28Mn28Cr8Al8則形成雙相FCC結(jié)構(gòu)。同時，兩種高熵合金在室溫下均表現(xiàn)出良好的壓縮性能；相較于Fe28Ni28Mn28Cr8Cu8，F(xiàn)e28Ni28Mn28Cr8Al8的屈服強度由716 MPa提高到1181 MPa，抗壓強度由1908 MPa提高為2111 MPa，硬度也由267 HV上升到482 HV，但塑性卻由38.6%降至26.1%。
關(guān)鍵字: 高熵合金；機械合金化；放電等離子燒結(jié)；微觀組織；力學(xué)性能
（Guangdong Key Laboratory for Advanced Metallic Materials Processing, South China University of Technology, Guangzhou 510640, China）
Abstract:Fe28Ni28Mn28Cr8Cu8 and Fe28Ni28Mn28Cr8Al8 high-entropy alloys (HEAs) were prepared by mechanical alloying (MA) and spark plasma sintering (SPS), and their microstructure and mechanical properties were studied in detail. The results show that a combination of FCC+BCC structure phases forms after MA in both HEAs. Compared with Fe28Ni28Mn28Cr8Cu8, the content of BCC-structured solid solution phase increases evidently in Al-containing Fe28Ni28Mn28Cr8Al8. After SPS sintering, one FCC and a small amount of Cr-rich phase can be observed in the bulk Fe28Ni28Mn28Cr8Cu8 HEA, while Fe28Ni28Mn28Cr8Al8 has two FCC phases. Additionally, both HEAs exhibit good compressive properties at room temperature. However, compared with Fe28Ni28Mn28Cr8Cu8, the Al-containing Fe28Ni28Mn28Cr8Al8 shows a higher strength with a lower plasticity. Compared with Fe28Ni28Mn28Cr8Cu8, the yield strength of Fe28Ni28Mn28Cr8Al8 increases from 716 MPa to 1181 MPa, the compressive strength increases from 1908 MPa to 2111 MPa, and the hardness increases from 267 HV to 482 HV, respectively, but the plasticity decreases from 38.6% to 26.1%.
Key words: high entropy alloy; mechanical alloying; spark plasma sintering; microstructure; mechanical property
