Ultra-high strength above 5000 MPa and soft magnetic properties of Co-Fe-Ta-B bulk glassy alloys
Ultra-high strength above 5000 MPa and soft magnetic properties of Co-Fe-Ta-B bulk glassy alloys
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DOI：
10.1016/j.actamat.2003.12.008
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发表时间：
2004-04-05
期刊：
影响因子：
9.4
通讯作者：
Yavari, AR
中科院分区：
文献类型：
--
作者：
Inoue, A;Shen, BL;Yavari, AR
采用铜模铸造法制备了玻璃化转变温度为910K、大过冷液相区温度为72K的玻璃状Co43Fe20Ta5.5B31.5合金棒材。该玻璃合金棒材具有5185 Mpa的超高断裂强度、268 Gpa的高杨氏模数、6.0×10(5)N的Kg(-1)比强度和31×10(6)N的Kg(-1)比杨氏模数。通过压缩试验获得的断裂强度、比强度和比杨氏模量值高于以往报道的任何晶体和玻璃合金的值。超高强度在698K温度范围内保持在5000 Mpa以上，断裂发生在一个主剪切带上，向应力轴倾斜44度，这意味着最大剪应力面的前方略有偏离。在过冷液相区，拉伸延伸率高达1400%，厚度变形率大于90%，具有良好的成形性。超高强度合金同时表现出良好的软磁性能：低的矫直力为0.25A/m，极高的磁导率为55万。该合金具有良好的变形性能和软磁性能，有望成为一种新型的超高强度材料。(C)2003年Acta Materialia Inc.由爱思唯尔有限公司出版。保留所有权利。
Glassy Co43Fe20Ta5.5B31.5 alloy rods with glass transition temperature of 9 10 K. followed by a large supercooled liquid region of 72 K were produced in the diameter range up to 2 mm by copper mold casting. The glassy alloy rods exhibit ultra-high fracture strength of 5185 MPa, high Young's modulus of 268 GPa, high specific strength of 6.0 x 10(5) N in kg(-1) and high specific Young's modulus of 31 x 10(6) N in kg(-1). The fracture strength, specific strength and specific Young's modulus obtained by compression test are higher than all previous values reported for any crystalline and glassy alloys. The ultra-high strength of over 5000 MPa persists in the temperature range up to 698 K. The fracture occurred on one major shear band which was declined by 44degrees to the stress axis implying the slight deviation front the maximum shear stress plane. Excellent formability is manifested by large tensile elongation of 1400% and large reduction ratio in thickness above 90%, in the supercooled liquid region. The ultra-high strength alloy exhibits simultaneously good soft magnetic properties: low coercivity of 0.25 A/m and an extremely high permeability of 550,000. The novel alloy is promising as a new ultra-high strength material with good deformability and soft magnetic properties. (C) 2003 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.