Nano AlN Effect on W-Cu Composite Material Hardness

The capacity of resisting a hard object pressed into its surface is called as hardness in physics. And tungsten copper composite material hardness is the basic indicator to evaluate the materials if soft or hard. According to different principle, tungsten copper hardness can be divided into scratch hardness, indentation hardness and rebound hardness.
Scratch hardness: Mainly used to compare the hardness of minerals, the method is selected from the soft end of a hard rod end, it will be measured along the rod across the material, soft and hard material being tested is determined according to the position of scratches (the hard draws a long scratch and the soft draws a short scratch);
Indentation hardness: Mainly used for metal materials, the method is to use a certain predetermined load of indenter into the test material, soft and hard surface of the material to local plastic deformation of the material being tested to compare the size (according to different indenter, load and duration, it also can be specifically divided into Brinell hardness, Rockwell hardness, Vickers hardness and micro hardness and so on);
Rebound hardness: Mainly used for metal materials, the method is to make a special free-fall from a certain height hammer impact test material, and specimen storage during impact (and then release) the strain energy of the number (by hammers bouncing height measurement) to determine material hardness.

W-Cu composite material usually uses Brinell hardness (HB) or Rockwell hardness (HR). In accordance with the addition of AlN and hardness measurements plotting the change curve, we can clearly found that the hardness of W-Cu composite material is improved with the increasing amount of nano AlN particles, which also indicates the addition of AlN particles reduced the interfacial bonding, but it played the role of fine grain strengthening and dispersion strengthening, especially for matrix copper. However, when the content exceeds 1%, the increasing trend of hardness is slowed down, because the density of tungsten-copper composite decreases, which leads to the increase of porosity in matrix.

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