Haasen plot analysis of the Hall–Petch effect in Cu/Nb nanolayer composites
We investigate the effects of layer thickness (t) on hardness (H) and rate sensitivity of the hardness (∂H/∂ ln ) in 1 μm-thick Cu/Nb nanolayer composites. For t < 10 nm, we find that H correlates with t according to H = H0 = H1t-1/2, suggestive of a Hall–Petch mechanism with layer interfaces rep...
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| Veröffentlicht in: | Journal of Materials Research 1999-02, Vol.14 (2), p.407-417 |
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| container_title | Journal of Materials Research |
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| creator | Tambwe, M. F. Stone, D. S. Griffin, A. J. Kung, H. Cheng, Y. Nastasi, M. |
| description | We investigate the effects of layer thickness (t) on hardness (H) and rate sensitivity of the hardness (∂H/∂ ln ) in 1 μm-thick Cu/Nb nanolayer composites. For t < 10 nm, we find that H correlates with t according to H = H0 = H1t-1/2, suggestive of a Hall–Petch mechanism with layer interfaces replacing grain boundaries as barriers against dislocation motion. The measured levels of ∂H/∂ ln clearly indicate the operation of bulk-like dislocation mechanisms consistent with a Hall–Petch mechanism. However, based on a Haasen-plot activation analysis, it appears that the Hall–Petch coefficient, H1, is strongly rate-dependent, inconsistent with a conventional Hall–Petch mechanism. For specimens with t < 10 nm there is a saturation in hardness, but the rate sensitivity data indicate no clear evidence of a corresponding change in mechanism. Simple models are proposed. |
| doi_str_mv | 10.1557/JMR.1999.0059 |
| format | Article |
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F. ; Stone, D. S. ; Griffin, A. J. ; Kung, H. ; Cheng, Y. ; Nastasi, M.</creator><creatorcontrib>Tambwe, M. F. ; Stone, D. S. ; Griffin, A. J. ; Kung, H. ; Cheng, Y. ; Nastasi, M.</creatorcontrib><description>We investigate the effects of layer thickness (t) on hardness (H) and rate sensitivity of the hardness (∂H/∂ ln ) in 1 μm-thick Cu/Nb nanolayer composites. For t < 10 nm, we find that H correlates with t according to H = H0 = H1t-1/2, suggestive of a Hall–Petch mechanism with layer interfaces replacing grain boundaries as barriers against dislocation motion. The measured levels of ∂H/∂ ln clearly indicate the operation of bulk-like dislocation mechanisms consistent with a Hall–Petch mechanism. However, based on a Haasen-plot activation analysis, it appears that the Hall–Petch coefficient, H1, is strongly rate-dependent, inconsistent with a conventional Hall–Petch mechanism. For specimens with t < 10 nm there is a saturation in hardness, but the rate sensitivity data indicate no clear evidence of a corresponding change in mechanism. 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However, based on a Haasen-plot activation analysis, it appears that the Hall–Petch coefficient, H1, is strongly rate-dependent, inconsistent with a conventional Hall–Petch mechanism. For specimens with t < 10 nm there is a saturation in hardness, but the rate sensitivity data indicate no clear evidence of a corresponding change in mechanism. Simple models are proposed.</description><subject>COMPOSITE MATERIALS</subject><subject>COPPER</subject><subject>DEFORMATION</subject><subject>DISLOCATIONS</subject><subject>HARDENING</subject><subject>HARDNESS</subject><subject>MATERIALS SCIENCE</subject><subject>NIOBIUM</subject><subject>STRAIN HARDENING</subject><subject>STRAIN RATE</subject><issn>0884-2914</issn><issn>2044-5326</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1999</creationdate><recordtype>article</recordtype><recordid>eNp1kM1OGzEUhS3USqSUZfdm090k_vd4iaJCikhbEF1bdzw2GZiMg-1IZNd36BvyJJ0oCFaVrnQ2n865-hD6QsmUSqlnV8vbKTXGTAmR5ghNGBGikpypD2hC6lpUzFBxjD7l_EAIlUSLCVouALIf8KaPBcMA_S53GceAy8rjBfT9y5-_v3xxK-xD8K7gbsDz7exHgwcYYg87n7CL603MXfH5M_oYoM_-9DVP0O-Lb3fzRXX98_L7_Py6coKrUnEgtdSB64ZA3Y7nnOSiNaRx2rGWKOaB8qBVw0PgbeBOSqoZOCqbYBjwE3R26I25dDa7cdutXByG8UPLBaXKjMzXA7NJ8Wnrc7HrLjvf9zD4uM2WKaOFYnQEqwPoUsw5-WA3qVtD2llK7F6sHcXavVi7F_vOd7n45zcY0qNVmmtp1eWNrdndrZRzYZcjP3vth3WTuvbe24e4TaPr_J-FfwDniec</recordid><startdate>19990201</startdate><enddate>19990201</enddate><creator>Tambwe, M. 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However, based on a Haasen-plot activation analysis, it appears that the Hall–Petch coefficient, H1, is strongly rate-dependent, inconsistent with a conventional Hall–Petch mechanism. For specimens with t < 10 nm there is a saturation in hardness, but the rate sensitivity data indicate no clear evidence of a corresponding change in mechanism. Simple models are proposed.</abstract><cop>New York, USA</cop><pub>Cambridge University Press</pub><doi>10.1557/JMR.1999.0059</doi><tpages>11</tpages></addata></record> |
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| subjects | COMPOSITE MATERIALS COPPER DEFORMATION DISLOCATIONS HARDENING HARDNESS MATERIALS SCIENCE NIOBIUM STRAIN HARDENING STRAIN RATE |
| title | Haasen plot analysis of the Hall–Petch effect in Cu/Nb nanolayer composites |
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