Experimental investigation and phase diagram of CoCrMnNi-Fe system bridging high-entropy alloys and high-alloyed steels

被引:44
作者
Ondicho, Ibrahim [1 ]
Choi, Minku [1 ,6 ]
Choi, Won-Mi [2 ]
Jeon, Jong Bae [3 ]
Jafarian, Hamid Reza [4 ]
Lee, Byeong-Joo [2 ]
Hong, Sun Ig [5 ]
Park, Nokeun [1 ]
机构
[1] Yeungnam Univ, Sch Mat Sci & Engn, Gyongsan 38541, South Korea
[2] Pohang Univ Sci & Technol POSTECH, Dept Mat Sci & Engn, Pohang 37673, South Korea
[3] Korea Inst Ind Technol, Funct Components & Mat R&D Grp, Busan 46742, South Korea
[4] Iran Univ Sci & Technol, Sch Met & Mat Engn, Tehran, Iran
[5] Chungnam Natl Univ, Dept Mat Sci & Engn, Daejeon 34134, South Korea
[6] Pohang Inst Met Ind Adv, Pohang 37666, South Korea
基金
新加坡国家研究基金会;
关键词
Entropy; Enthalpy; Mechanical properties; Phase diagram; Microstructure; Thermodynamic modeling; MECHANICAL-PROPERTIES; SINGLE-PHASE; TWIP STEEL; HIGH-STRENGTH; GRAIN-GROWTH; DEFORMATION; STABILITY; MICROSTRUCTURE; BEHAVIOR; PLASTICITY;
D O I
10.1016/j.jallcom.2019.01.134
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
An investigation of equiatomic and non-equiatomic high-entropy alloys (HEAs) and medium-entropy alloys (MEAs) was carried out by performing both thermodynamic calculations and experiments. The design strategy of the alloys was based on a constant valence electron concentration (VEC) of 8 while varying the content of Fe in a Fe,(CoCrMnNi)(100-x )where x = 00, 20, 40, and 60. The X-ray diffraction results showed that the alloys have a single face-centered cubic structure at 900 degrees C. The tensile test results revealed that both the yield strength and ultimate tensile strength decrease as the amount of Fe is increased but the uniform elongation increases. Additionally, the strain-hardening rate is significantly enhanced at higher Fe concentrations due to the activation of deformation twinning as an additional deformation mechanism. Interestingly, the critical twinning stress is significantly reduced as the Fe content is increased from Fe00 to Fe60. As a result, the deformation twins were easily activated in a specimen deformed up to a true strain of 20% for Fe60, unlike the other alloys, which exhibited no deformation twinning at the same true strain. Furthermore, it was revealed that the frequency of deformation twinning increases proportionally with increase in the Fe content. (C) 2019 Elsevier B.V. All rights reserved.
引用
收藏
页码:320 / 327
页数:8
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