Micro Materials CORE Range: Nano-Impact

The Nano-impact is rapidly becoming a valuable tool in the development of coatings for longer-life in high-speed machining and for better productivity in machining hard-to-cut materials for the automotive and aerospace sectors.

The main features of the nano-impact technique are as follows:

  • Allows quick quantitative results to replace time-consuming field trials and offers higher surface sensitivity compared to bulk impact tests
  • Assesses damage tolerance and fatigue resistance of thin films to several high energy density impacts
  • Extends nanomechanical testing to much higher strain rates so that strain rate sensitivity can be analyzed over a wider and more practically useful range

The CORE Nano-impact tester includes the company’s patented and unique technology for:

  • Piezo-Oscillation Impact – high cycle contact fatigue
  • Single Impact – high strain rate indentation and dynamic hardness
  • Multiple Impact – repetitive contact for toughness, fatigue resistance, and damage tolerance

This is ideal for analyzing coatings for a broad range of applications including tool coatings, photovoltaic coatings, DLC for automotive, and several others.

Sample Oscillation Impact

In sample oscillation, impact a piezo is used to produce high frequency oscillations at low amplitudes. Sample oscillation impact is lower energy than the probe based impact but has the benefit of being able to analyze high cycle impact resistance.

Contact fatigue of nanostructured AlTiN on WC-Co. Oscillation frequency 80 Hz with pulsed oscillation cycles as shown in the bottom right of the image. The wear rate increases after 190 s testing time due to coating fracture.

This technique can be used to evaluate:

  • High cycle impact resistance
  • Fatigue resistance

Multiple Impact

Probe oscillation impact is used to strike the same position on the sample surface to produce cumulative high strain rate impact damage.

Nano-impact can be used to simulate erosion damage as seen in this study of comparative resistance of thermally aged and as received thermal barrier coatings.The nano-impact results show an excellent correlation to erosion tests due to the high strain rate and closely matched contact size in both tests.

This technique can be used to evaluate:

  • Toughness
  • Erosion resistance
  • Fatigue resistance
  • Damage Tolerance
  • Cutting/turning/milling performance

The benefit of the nano-impact test is the short duration of the experiments compared to traditional tests allowing fast screening to evaluate the performance of novel material compositions.

Single Impact

The single impact method provides a reliable way to attain quantitative data about the energy damping and strain rate sensitivity of materials.

High quality displacement sensors and rapid data capture allow users to inspect the evolution of the impact damping behavior of bulk materials and coatings in real time.

Comparison between the static and dynamic hardness of aluminum alloy and gold samples which have undergone different processing. This demonstrates the greater strain rate sensitivity of the work hardened gold.

Impact data can be examined to establish:

  • Impact energy
  • Dynamic hardness
  • Crater volume
  • Impact force impact
  • Strain rate energy density

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