Abstract
Oxygen in titanium is a potent alpha stabilizer that provides solid solution strengthening. This study presents a method of exploiting surface hardening of titanium particulate media. Hardening was measured on particulate matter and compared to a bulk specimen with nanoindentation. Thermal exposure parameters increased surface hardness from ≈ 3 GPa to over 8 GPa as measured via nanoindentation. This process produced solid solution strengthening without creating a distinct oxide layer or significant sintering of particles.
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This work was supported in part by Electronics Inc. and the Center for Surface Engineering Enhancement at Purdue University through the Indiana Manufacturing Competitiveness Center. The authors appreciate helpful discussions about shot peening with Jack Champaigne of EI.
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Manuscript submitted April 1, 2019.
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Brice, D.A., Rahimi, R.M. & Bahr, D.F. Hardening Particulate Ti Media Through Controlled Oxidation. Metall Mater Trans A 50, 3980–3984 (2019). https://doi.org/10.1007/s11661-019-05326-6
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DOI: https://doi.org/10.1007/s11661-019-05326-6