|
Chromium hydride, also known as chromium–hydrogen alloy, is an alloy of chromium, hydrogen, and possibly other elements. An alloying element intentionally added to modify the characteristics of chromium hydride is titanium. Hydrogen reduces the stress necessary to force dislocations in the chromium atom crystal lattice to slide past one another. Varying the amount of hydrogen and other alloying elements and the form of their presence in the chromium hydride (solute elements, precipitated phase) controls qualities such as the hardness, ductility, and tensile strength of the resulting chromium hydride. Chromium hydride with increased hydrogen content can be made softer and more ductile than chromium. ==Chromium hydride phases== At room temperature, the most stable form of chromium is the body-centered cubic (bcc) structure α-chromium. As the hydrogen concentration in chromium increases the following are observed:- *For compositions between CrH0.5 and CrH the metal lattice changes to hexagonal close packed (hcp), and the hydrogen atoms are in octahedral positions in the lattice *For compositions between CrH and CrH2 the metal lattice structure changes to face centred cubic (fcc) with hydrogen atoms again occupying octahedral positions. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Chromium hydride」の詳細全文を読む スポンサード リンク
|