(1. 陜西理工大學(xué) 材料科學(xué)與工程學(xué)院，漢中 723000；
2. 陜西理工大學(xué) 礦渣綜合利用環(huán)保技術(shù)國家地方聯(lián)合工程實驗室，漢中 723000)
摘 要: 設(shè)計開發(fā)了一種非等原子(FeCoNiCr)100-xMnx(x=0, 12, 20)高熵合金的制備工藝。結(jié)果表明：采用真空熱壓燒結(jié)技術(shù)制備的含Mn型(FeCoNiCr)100-xMnx合金由面心立方(FCC)和體心立方(BCC)相組成，其中有大量的納米級金屬間化合物析出。經(jīng)650 ℃退火1h后，(FeCoNiCr)88Mn12合金的綜合力學(xué)性能最佳，壓縮屈服強度為873.65 MPa，極限抗壓強度為1813.98 MPa，斷裂應(yīng)變?yōu)?1.03%，彎曲強度為1573.69 MPa，斷裂韌性為49.45 MPa·m1/2。優(yōu)異的力學(xué)性能歸因于BCC相的強化作用以及低堆垛層錯能區(qū)域所形成的大量退火孿晶。孿晶誘導(dǎo)塑性(TWIP)輔助的非等原子雙相高熵合金設(shè)計理念，為高熵合金成分設(shè)計提供了一種新的思路。
關(guān)鍵字: 高熵合金；微觀組織；力學(xué)性能；第二相強化；退火孿晶
（1. School of Materials Science and Engineering, Shaanxi University of Technology, Hanzhong 723000, China;
2. National & Local Joint Engineering Laboratory for Environmental Protection Technology for Comprehensive Utilization of Slag, Shaanxi University of Technology, Hanzhong 723000, China）
Abstract:The Non-equiatomic (FeCoNiCr)100-xMnx(x=0, 12, 20) high-entropy alloys were studied. The results indicate that (FeCoNiCr)100-xMnx alloys containing Mn prepared by vacuum hot pressing sintering present dual-phase microstructure compose of the face centered cubic (FCC)/body centered cubic (BCC) phases, in which a lot of nanometer intermetallic compounds precipitate. The (FeCoNiCr)88Mn12 alloy after annealed at 650 ℃ for 1 h has the best comprehensive mechanical properties, with compressive yield strength of 873.65 MPa, ultimate compressive strength of 1813.98 MPa, fracture strain of 41.03%, flexural strength of 1573.69 MPa and fracture toughness of 49.45 MPa·m1/2. The excellent comprehensive mechanical properties are attributed to the second phase strengthening effect of BCC phases and a large number of annealing twins form in the low stacking fault energy region. The design concept of TWIP-assisted non-equiatomic dual-phase high-entropy alloys can provide a new idea for the composition design of high-entropy alloys.
Key words: high-entropy alloy; microstructure; mechanical properties; second phase strengthening; annealing twin
