The Age-Hardening Mechanism of Nanocrystalline Ni-P Alloys Synthesized by Electrodeposition

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<jats:p>Strengthening mechanism of age-hardenable electrodeposited Ni-P alloy was investigated focusing on the role of Ni<jats:sub>3</jats:sub>P precipitates in nanocrystalline structures. Specimens were synthesized by electrodeposition followed by aging treatment at temperatures raging from 473 to 773 K. As-electrodeposited structures became only Ni phase and Ni<jats:sub>3</jats:sub>P precipitated by the subsequent aging treatment. Distribution of grain size of Ni matrix was examined in detail by field-emission type transmission electron microscopy. The specimens became harder with higher P content after the electrodeposion and aging treatment. After the aging treatment 573 K or bellow, average grain size of Ni matrix was under 10 nm. On the other hand, after aging at 673 and 773 K both the grain size of Ni matrix and Ni<jats:sub>3</jats:sub>P particle size grow to be comparable. It is considered the hard interphase boundary to the dislocation slip is responsible to the hardening rather than the classical precipitation hardening.</jats:p>

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