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The Basics of Nonferrous Metallurgy

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Titanium-Nickel Shape Memory Alloys

Shape memory alloys are categorized by two very unique properties; pseudo-elasticity (PE), and the shape memory effect (SME).
Since SMA’s are hugely versatile and functional materials they have a range of important applications to fulfill including bone transplant replacements, sensors, antennas for mobile phones and much more.

Toughness Variation for Liquid Phase Sintered W-Ni-Fe

The heavy alloys are tungsten based two-phase composites used in applications requiring high density. The alloys are liquid phase sintered from blended elemental powders. After sintering, the microstructure consists of a rounded tungsten phase (typically 50 am in diameter) surrounded by a matrix phase containing dissolved tungsten.
In spite of numerous studies on the heavy alloys dating back to the 1930’s, there is still uncertainty as to the sources of toughness variation. Considering the large number of parameters associated with this material, the observed variability in toughness is not surprising.

Tribological properties of Aluminum Alloys: Part One

Various types of aluminum alloys are continually being developed to improve their wear resistance. Among these alloys, aluminum-silicon (Al-Si) alloys have been found to be beneficial in many industrial applications and considered to be appropriate substitutes for cast iron components.
A large number of studies in recent years have been devoted to investigate the friction and wear behavior of Al-Si alloys. However, most of these studies were conducted under dry sliding conditions.

Tribological Properties of Aluminum Alloys: Part Two

Silicon has received the most attention among all alloying elements studied. This is due to the fact that Al-Si alloys are corrosion resistant, strong, have low thermal expansion coefficients, and have superior tribological characteristics compared to the other aluminum alloys.
Researchers, who have conducted tests under dry conditions, tend to agree that the initial size of Si particles is not important.

Tungsten Carbide Metals: Part One

Tungsten Carbide is one of only a few materials which would be considered for some of the toughest tooling jobs in industry.
Formally classified as a refractory carbide Tungsten Carbide has exceptional mechanical and thermal properties with a melting point in excess of 1800°C and extremely high hardness.

Tungsten Carbide Metals: Part Two

By definitions composite materials consist of two or more materials which have clear distinction and different chemical composition.
Tungsten composite powders can be made by a number of technological techniques ranging from reduction of cobalt oxide mixtures to the precipitation of colbalts onto the tungsten carbide surface.