Super-high strength of over 4000 MPa for Fe-based bulk glassy alloys in [(Fe1-x,COx)0.75B0.2Si0.05]96Nb4 system
Super-high strength of over 4000 MPa for Fe-based bulk glassy alloys in [(Fe1-x,COx)0.75B0.2Si0.05]96Nb4 system
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DOI：
10.1016/j.actamat.2004.05.022
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发表时间：
2004-08-16
期刊：
影响因子：
9.4
通讯作者：
Chang, CT
中科院分区：
文献类型：
--
作者：
Inoue, A;Shen, BL;Chang, CT
采用铜模铸造法在[（Fe1-xCox）（0.75）B0.2Si0.05]（96）Nb-4系统中制备了直径达5mm的新型铁基大块非晶合金。Co替代Fe引起玻璃形成能力（GFA）的增加。随着Co含量的增加，液相线温度（T-I）降低，导致约化玻璃化转变温度（T-g/T-I）从0.566增加到0.587。大块非晶合金具有3900 - 4250 MPa的超高断裂强度、190 - 210 GPa的杨氏模量（E）、0.02的弹性应变（ε（e））、0.0025的塑性应变（ε（p））和1150 - 1220的维氏硬度（H-v）。这些玻璃态合金的σ（f）/E和H-v/3E分别为0.02，与许多块体玻璃态合金的先前数据一致。结果表明，这些铁基大块非晶合金具有弹塑性变形模式。具有4000 MPa以上超高断裂强度和高非晶形成能力的高强度铁基大块非晶合金的合成是铁基大块非晶合金作为结构材料的发展方向。(C)2004 Acta Materialia Inc.由爱思唯尔有限公司出版。保留所有权利。
New Fe-based bulk glassy alloys with diameters up to 5 mm were formed in [(Fe1-xCox)(0.75)B0.2Si0.05](96)Nb-4 system by the copper mold casting method. The substitution of Co for Fe causes an increase in the glass-forming ability (GFA). As the Co content increases, the liquidus temperature (T-l) decreases, resulting in an increase of reduced glass transition temperature (T-g/T-l) from 0.566 to 0.587. The bulk glassy alloys exhibit super-high fracture strength of 3900-4250 MPa, Young's modulus (E) of 190-210 GPa, elastic strain (epsilon(e)) of 0.02, plastic strain (epsilon(p)) of 0.0025 and Vickers hardness (H-v) of 1150-1220. The sigma(f)/E and H-v/3E of these glassy alloys are 0.02, respectively, in agreement with the previous data for a number of bulk glassy alloys. The agreement indicates that these Fe-based bulk glassy alloys have an elastic-plastic deformation mode. The syntheses of high-strength Fe-based bulk glassy alloys with super-high fracture strength of over 4000 MPa and high glass-forming ability are encouraging for future development of Fe-based bulk glassy alloys as structural materials. (C) 2004 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.