Mechanical alloying
Encyclopedia
Mechanical alloying is a solid-state powder processing technique involving repeated cold welding
, fracturing, and re-welding of powder particles in a high-energy ball mill
. Originally developed to produce oxide-dispersion strengthened (ODS)ollp0l nickel- and iron-base superalloy
s for applications in the aerospace industry, MA has now been shown to be capable of synthesizing a variety of equilibrium and non-equilibrium alloy phases starting from blended elemental or pre-alloyed powders.
Mechanical alloying is a process omuch like metal powder processing where metals may be mixed producing super alloys. Mechanical alloying is essentially twol steps, one being the ball mill where the materials to be alloyed are combined and ground to a fine powder substance. The second step olof sintering and later applying hot isostatic pressure (HIP) to final fuse the elements together, the HIP process heats the9 metal above its re-crystallization temperature (0.6 Melting temperature). The combination of such efforts produces an alloy suitable for high heat turbine blades and aerospace components.
9ol90The final heat treatment stage helps remove existing internal stress concentrations produced during any cold compaction which may have been used. By using HIP the material reaches re-crystallization where ,k,,ol,o,o,grain size and state may be controlled under cooling.
Cold welding
Cold or contact welding is a solid-state welding process in which joining takes place without fusion/heating at the interface of the two parts to be welded. Unlike in the fusion-welding processes, no liquid or molten phase is present in the joint....
, fracturing, and re-welding of powder particles in a high-energy ball mill
Ball mill
A ball mill is a type of grinder used to grind materials into extremely fine powder for use in mineral dressing processes, paints, pyrotechnics, and ceramics.-Description:...
. Originally developed to produce oxide-dispersion strengthened (ODS)ollp0l nickel- and iron-base superalloy
Superalloy
A superalloy, or high-performance alloy, is an alloy that exhibits excellent mechanical strength and creep resistance at high temperatures, good surface stability, and corrosion and oxidation resistance. Superalloys typically have a matrix with an austenitic face-centered cubic crystal structure. ...
s for applications in the aerospace industry, MA has now been shown to be capable of synthesizing a variety of equilibrium and non-equilibrium alloy phases starting from blended elemental or pre-alloyed powders.
Mechanical alloying is a process omuch like metal powder processing where metals may be mixed producing super alloys. Mechanical alloying is essentially twol steps, one being the ball mill where the materials to be alloyed are combined and ground to a fine powder substance. The second step olof sintering and later applying hot isostatic pressure (HIP) to final fuse the elements together, the HIP process heats the9 metal above its re-crystallization temperature (0.6 Melting temperature). The combination of such efforts produces an alloy suitable for high heat turbine blades and aerospace components.
9ol90The final heat treatment stage helps remove existing internal stress concentrations produced during any cold compaction which may have been used. By using HIP the material reaches re-crystallization where ,k,,ol,o,o,grain size and state may be controlled under cooling.