# High-Speed Impact Converts Diamond to Graphite in Microseconds

- Published: 2026-11-08 16:17 UTC
- Section: Machines & Making › Materials science
- Tags: diamond, graphite, impact, energy absorption, materials science
- URL: https://realtech.media/news/rt-35b37584ec4d0345022be0d4_high_speed_impact/

**A projectile traveling over eight times the speed of sound transformed diamond grains into graphite, revealing insights into material behavior under extreme pressure.**

![High-Speed Impact Converts Diamond to Graphite in Microseconds](https://realtech.media/media/2026/11/5cbf1d2272ef96f9.jpg)
*Steve Jurvetson from Los Altos, USA, Wikimedia Commons, CC BY 2.0*

A recent study conducted by researchers from Texas A&M University, Rice University, and other institutions demonstrated that a projectile traveling more than eight times the speed of sound can convert diamond grains into graphite upon impact with a hard composite material. This transformation occurred in microseconds, breaking the material apart and providing valuable insights into how hard materials absorb energy under extreme pressure. The findings were reported in Materials Today.

The researchers created a bulk material containing diamond grains measured in micrometers. Maintaining the diamond structure during manufacturing proved challenging, as the heat required to bind the material could convert diamond into graphite. To address this, the team employed a rapid heat and pressure application process, using cubic boron nitride as the surrounding material and cobalt to stabilize the diamond grains.

In their experiments, the team fired aluminum projectiles at the composite targets. A one-millimeter projectile traveling at approximately 7.5 times the speed of sound did not cause significant damage, but a four-millimeter projectile moving at about 8.45 times the speed of sound resulted in the target breaking apart. Analysis of the fragments revealed that the diamond particles in the impacted material had largely transformed into graphite.

Computer simulations were utilized to explore how the shockwave rearranged carbon atoms during the impact. The recovered material exhibited boundaries where diamond and graphite met, offering clues about the transformation process. The researchers suggested that the conversion of diamond to graphite absorbed part of the impact energy, indicating that energy absorption and structural integrity are separate performance metrics.

The study's findings could inform the development of materials capable of withstanding impacts from fast-moving debris, such as those encountered by spacecraft. Future research may focus on how material thickness and composition influence the transformation and damage during impacts.

## Sources

1. [knowridge.com](https://knowridge.com/2026/11/a-hypersonic-impact-turned-diamond-into-graphite-in-a-flash)

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Source: RealTech, realtech.media — https://realtech.media/news/rt-35b37584ec4d0345022be0d4_high_speed_impact/