The strength-normalized fatigue endurance strength of the bulk metallic glass (BMG) Zr₅₂.₅Cu₁₇.₉Ni₁₄.₆Al₁₀Ti₅ (Vitreloy 105) has been reported to be the highest for any BMG; however, to date, there has been no explanation of why this material is so much better than other Zr-based compositions. In this study, the fatigue-crack growth...
New types of exchange arrangements are becoming
increasingly popular for a wide range of goods traded
internationally. Several types of countertrade
arrangements have been identified, ranging from pure
barter to more elaborate schemes where only a portion of
the trade is "paid for" in goods, including bilateral
trading agreements with...
This study was set up to examine selected aspects of
the knowledge of welding metallurgy that is a part of the
background of present teacher educators who teach welding
courses for Industrial Arts majors.
Specifically this study was made to answer the following
questions:
1. What knowledge is now possessed...
Tungsten alloys containing approximately 0.75 and 2.3 vol pct Zr0₂
were prepared by powder metallurgical methods from blends
of commercial
tungsten powder and ZrW₂ powder.
A heat treatment of the extruded rods
at 1800°C was found to produce a stable structure with a
dispersion of
Zr0₂ particles in the tungsten...
A method for measuring the spark-shower radiance of metals
when abraded on an abrasive grinding wheel was developed for
evaluating their sparking tendency. One hundred metals were tested
and rated relative to commercially pure iron. The radiance was
measured in units of energy per solid angle per area of the...
Relatively simple methods are developed for obtaining discreet
orientation characterization of preferred orientation from x-ray
diffraction-determined pole figure data. It is demonstrated how this
information, along with the single crystal elastic constants, can be
used to calculate Young's modulus as a function of sheet direction.
Computer programs are developed for...
High purity vanadium, both in the polycrystalline
and monocrystalline form, was strained in tension in
order to study the controlling deformation mechanism at
temperatures between 77 and 293°K. The temperature and
strain rate dependence of the flow stress for two grades
of material, 99.99% and 99.93%, was evaluated using temperature...