ISSN:
1573-4803
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract This paper presents the Young's modulus of Fe100−x−y Si x B y , Fe100−x−y P x C y , Co100−x−y Si x B y , Pd77.5Cu6Si16.5, Pd48Ni32P20 and Pt60Ni15P25 amorphous wires determined from the Young's modulus sound velocity measurement. With increasing metalloid content, the Young's modulus increases from 1.58×1011 to 1.87×1011 N m−2 for Fe-Si-B, from 1.40×1011 to 1.52×1011 N m−2 for Fe-P-C and from 1.73×1011 to 1.75×1011 N m−2 for Co-Si-B systems. The increase in Young's modulus with the amount of metalloid elements is the largest for B, followed by Si, C and then P. The Young's modulus of Fe- and Co-Si-B amorphous wires increases significantly with the replacement of iron or cobalt by IV–VII group transition metals. It was recognized that there existed a strong correlation between Young's modulus (E) and tensile fracture strength (σ f); the ratio of σ f to E is approximated to be 0.02 for all the amorphous wires investigated. These results imply that the Young's modulus is dominated mainly by the structural and compositional short-range orderings due to the strong interaction between metal and metalloid atoms which hinders the internal displacements. The existence of a constant ratio for σ f/E was interpreted to originate from a common mechanism for plastic flow of the amorphous wires. Further, it was noted that the Young's modulus of the Fe- and Co-based amorphous wires with diameters of ≃ 100 to 120 Μm was slightly lower than that of the amorphous ribbons with thicknesses of ≃ 20 to 25 Μm. This difference was attributed to the difference in structural ordering due to the differences in the solidification processes.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00547591
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