Mechanical Properties and Thermal Stability of (Fe, Co, Ni)-M-B (M=IV, V and VI Group Transition Metals) Amorphous Alloys with Low Boron Concentration

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New type amorphous alloys, whose compositions do not belong to the previous categories, have been found in wide composition ranges of iron, cobalt or nickel-IV, V or VI group transition metal-boron ternary alloys containing less than 10 at% B by a melt spinning technique. Vickers hardness (H_v) and crystallization temperature (T_x) of these amorphous alloys increase definitely with the amount of the transition metal (M) or boron element. The H_v and T_x values are highest for the alloys containing hafnium followed by zirconium, tantalum, titanium and then niobium. Only when the H_v and T_x values are plotted as a function of the difference of electronegativity between the base metal (Fe, Co or Ni) and M or the metalloid (B) and M, it has been found that there exists an apparent linear relationship and the larger the difference in electronegativity, the higher is the H_v and T_x. It is therefore inferred that a strong chemical interaction between the base metal and M or boron and M plays an important role in the H_v and T_x of the amorphous alloys.
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