An unsolved mystery: The composition of bcc Cu alloy precipitates in bcc Fe and steels

作者：Fine M E^*; Liu J Z; Asta M D

来源：Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing, 2007, 463(1-2): 271-274.

DOI：10.1016/j.msea.2006.07.164

• copper precipitates
• steel composition

Copper precipitation strengthened steels are of considerable technical importance. An application to a new bridge in Illinois is described. The Cu precipitates are body centered cubic (bcc) and a few nanometer in diameter at maximum strength. While recently published ab initio calculations of the mixing energy at 0 K predict that bcc Cu precipitates in bcc Fe should be pure Cu, literature data show that they contain almost 50% Fe according to atom probe tomography whereas combined small angle neutron and magnetic scattering predicts the composition is almost pure Cu. Possible sources of these differences are discussed.

• 出版日期2007-8-15
• 单位西北大学