Tungsten heavy alloys (WHAs) combine tungsten's exceptional density with improved manufacturability through powder metallurgy techniques. These materials offer densities approaching pure tungsten (17.0-19.0 g/cc) while avoiding its extreme processing temperatures. Produced via liquid phase sintering, WHAs exhibit excellent mechanical properties with a distinctive spheroidized microstructure of tungsten particles in a ductile metal matrix.
Twin Roll Casting of Al Alloys: Part One
Aluminum twin roll casting is a relatively new processing technology which allows for liquid aluminum to be transformed into strip directly with the integration the casting and hot rolling production phases.The advantages are outstanding particularly in relation to cost savings through the simplified process, and low energy costs but how does the technique compare to more established processes like direct chill methods when we are considering the microstructure and subsequent attained material properties?
Work Hardening Aluminum Alloys: Part One
This article examines the fundamental principles and applications of strain hardening in aluminum alloys. It explains how work hardening naturally occurs during forming operations and significantly enhances strength properties in both heat-treatable and non-heat-treatable aluminum alloys. The paper details the standardized temper designation system for strain-hardened alloys, covering the full spectrum from quarter-hard to extra-hard conditions.
Work Hardening Aluminum Alloys: Part Two
Work hardening significantly alters the internal structure and mechanical properties of aluminum alloys, particularly affecting tensile strength and ductility. Non-heat-treatable alloys demonstrate increased strength through cold work, though this comes at the expense of formability and elongation properties. The work-hardening behavior follows parabolic relationships described by stress-strain equations, with variations depending on temperature, strain rate, and initial material condition.