Magnetic softening of young's modulus of amorphous Fe90Zr10
Abstract The Young's modulus and the internal friction of amorphous Fe90Zr10 alloy were measured near the Curie temperature using the vibrating reed technique. The modulus shows softening around Tc(= 227 K) and the internal friction undergoes drastic increase in the same temperature range. It is found that both the Young's modulus and the reciprocal of internal friction are inversely proportional to the magnetic susceptibility in the paramagnetic phase.
Hydrogen induced inelastic anomaly in Fe/sub 80/Zr/sub 20/ multilayers
This study investigated the effect of electrolytic hydrogenation on the mechanical and magnetic properties of compositionally modulated (CM) Fe/Zr multilayers with composition Fe/sub 80/Zr/sub 20/ and modulation wavelengths (/spl lambda/) in the range 3 /spl Aring//spl les//spl lambda//spl les/50 /spl Aring/. An amorphous (a) to crystalline (c) structural transition occurred in the Fe sublayers of multilayers with /spl lambda/ between 30 /spl Aring/ and 50 /spl Aring/. A rapid relaxation in the stress induces by hydrogenation was observed only in multilayers with /spl lambda/=20 /spl Aring/. The relaxation was confirmed as a structural change by a simultaneous relaxation in coercivity, that also occurred only in the /spl lambda/=20 /spl Aring/ multilayer. This inelastic anomaly is compatible with previous reports of a bond softening precursor to the amorphous/spl rarr/crystalline phase transition in Fe multilayers.
Determination of Optimal Ball-Burnishing Parameters for Plastic Injection Moulding Steel
The objective of this study is to determine the optimal plane ball-burnishing parameters for plastic injection moulding steel PDS5 on a machining centre by utilising the Taguchi’s orthogonal array method. The design and manufacture of a burnishing tool are described. Four burnishing parameters, namely the ball material, burnishing speed, burnishing force and feed, were selected as the experimental factors in Taguchi’s design of experiments to determine the optimal burnishing parameters which have the dominant influence on surface roughness. The optimal burnishing parameters were found after carrying out the experiments specified by Taguchi’s L18 orthogonal table, by the analysis of variation, and by a full factorial experiment. The optimal plane burnishing parameters for the plastic injection moulding steel PDS5 were a combination of a tungsten carbide ball, a burnishing speed of 200 mm/min, a burnishing force of 300 N and a feed of 40 μm. The surface roughness Ra of the specimen can be improved from about 1 μm to 0.07 μm by using the optimal burnishing parameters for plane burnishing.