NDR® (Nanograin Damage Resistant) wire has undergone a thermal-mechanical treatment designed to produce nanoscale microstructure refinement. This enhancement provides an increase in the material’s ability to resist damage during high cycle mechanical loading.
The process we use to create our NDR® wire does not compromise the chemical or atomic structure of the parent alloy. Other properties such as density, electrical resistivity, thermal conductivity, and thermal coefficient of expansion remain similar to that of the original wire.
The performance of NDR® wire is attributable to the underlying microstructure. Conventional microstructure is shown below (left), where the average breadth of each grain is 2 microns. The next image (right) shows NDR®-refined microstructure where similar features are on the order of 200 nm.
The tensile mechanical properties of NDR® wire remain similar to that of conventional wire. The table below shows three examples of possible properties for 35N LT®.
|35N LT® NDR® Wire||35N LT® Conventional Wire|
|Ultimate Strength GPa (ksi)||1.45 (210)||1.79 (260)||2.21 (320)||1.31 (190)||1.79 (260)||2.21 (320)|
|0.2% Yield Strength GPa (ksi)||1.31 (190)||1.45 (210)||2.00 (290)||0.69 (1.00)||1.45 (210)||2.00 (290)|
|Rupture Strain (%)||15||4||2||35||4||2|
|Fatigue Strength GPa (ksi)||1.14 (165)||1.21 (175)||1.14 (165)||0.62 (90)||0.83 (120)||0.93 (135|