From ATI Wah Chang

Titanium, zirconium, and nickel alloy threaded fasteners make excellent mechanical joints. Like any materials, however, they have advantages and disadvantages. There are some design, procurement, and manufacturing practices that can increase the success of those joints. This paper will try to point out some of the strengths and difficulties of these materials as fasteners, and suggest some practices that alleviate difficulties while taking advantage of strengths.

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Master Alloys and Alloying Additives
Master alloys and alloying additives are alloy element concentrates, grain refiners, hardeners, deoxidants and other agents added into a melt or metal powder blend to produce a particular alloy, modify a melt or alter processing characteristics.
Tungsten and Tungsten Alloys
Tungsten and tungsten alloys are refractory metals or alloys with a very high melting point and high density.
Molybdenum and Molybdenum Alloys
Molybdenum and molybdenum alloys are refractory metal and alloys with a very high melting point (non-alloy 2623 °C) and a low thermal expansion coefficient. They are used to fabricate evaporation crucibles, electrodes, rocket technology, furnace components, glass and zinc processing tools, and electrical contacts.
Bimetals and Clad Alloys
Bimetals and clad alloys consist of two or more different alloy layers that are integrally bonded together; usually into a metal plate, strip, sheet, or other stock shape.

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