Enhancement of the fracture strength and glass-forming ability of CoFeTaB bulk glassy alloy
Enhancement of the fracture strength and glass-forming ability of CoFeTaB bulk glassy alloy
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DOI：
10.1088/0953-8984/17/37/003
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发表时间：
2005-09
期刊：
影响因子：
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通讯作者：
B. Shen;A. Inoue
中科院分区：
文献类型：
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作者：
B. Shen;A. Inoue
Co43Fe20Ta5.5B31.5块体非晶合金在Co基非晶合金中具有最好的非晶形成能力（GFA），在所有已知的块体晶态和非晶合金中具有最高的强度（压缩真强度σf = 5185 MPa）。为了合成具有更高强度和更大玻璃体积分数的新型Co基大块非晶合金，我们研究了Mo和Si的添加对Co-（Fe，Mo，Ta）-（B，Si）系统中σf和玻璃体积分数的影响。少量的2at.%在Co-Fe-Ta-B非晶合金中加入Mo，合金的抗弯强度达到5545 MPa，弹性模量达到282 GPa。通过进一步添加1和2at.%合成了直径达3 mm的Si，Co-（Fe，Mo，Ta）-（B，Si）大块非晶合金，其σf大于4450 MPa，E大于227 GPa。此外，超高强度玻璃合金同时表现出优异的软磁性能，即，饱和磁化强度为0.32-0.35 T，低矫顽力为0.7-1.1 A m-1，有效磁导率在1 kHz时为3.9-4.77 × 104。GFA和σf的提高被解释为由于Mo和Si的加入增强了原子成键性质。
Co43Fe20Ta5.5B31.5 bulk glassy alloy has the best glass-forming ability (GFA) among the Co-based glassy alloys, and the highest strength (the compressive true strength σf = 5185 MPa) among all known bulk crystalline and glassy alloys. With the aim of synthesizing new Co-based bulk glassy alloys with much higher strength and much larger GFA, we investigated the effect of Mo and Si additions on the enhancement of σf and GFA in the Co–(Fe, Mo, Ta)–(B, Si) system. The small amount of 2 at.% Mo added to the Co–Fe–Ta–B glassy alloy resulted in obtaining an ultrahigh true fracture strength of 5545 MPa and high Young’s modulus (E) of 282 GPa. By further adding 1 and 2 at.% Si, Co–(Fe, Mo, Ta)–(B, Si) bulk glassy alloys were synthesized in the diameter range up to 3 mm, and they exhibited σf of over 4450 MPa and E of over 227 GPa. In addition, the ultrahigh-strength glassy alloys simultaneously exhibited excellent soft magnetic properties, i.e., saturation magnetization of 0.32–0.35 T, low coercive force of 0.7–1.1 A m−1, and high effective permeability of 3.9–4.77 × 104 at 1 kHz. The improvement of GFA and σf is interpreted to result from the enhanced atomic bonding nature by adding Mo and Si.