Effect of temperature and grain size on the dominant diffusion process for superplastic flow in an AZ61 magnesium alloy
The effect of temperature and grain size on superplastic flow was investigated using a relatively coarse-grained (∼20 μm) Mg–Al–Zn alloy for the inclusive understanding of the dominant diffusion process. Tensile tests revealed that the strain rate was inversely proportional to the square of the grai...
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| Veröffentlicht in: | Acta Materialia 1999-10, Vol.47 (14), p.3753-3758 |
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| container_title | Acta Materialia |
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| creator | Watanabe, H. Mukai, T. Kohzu, M. Tanabe, S. Higashi, K. |
| description | The effect of temperature and grain size on superplastic flow was investigated using a relatively coarse-grained (∼20 μm) Mg–Al–Zn alloy for the inclusive understanding of the dominant diffusion process. Tensile tests revealed that the strain rate was inversely proportional to the square of the grain size and to the second power of stress. The activation energy was close to that for grain boundary diffusion at 523–573 K, and was close to that for lattice diffusion at 598–673 K. From the analysis of the stress exponent, the grain size exponent and activation energy, it was suggested that the dominant diffusion process was influenced by temperature and grain size. It was demonstrated that the notion of effective diffusivity explained the experimental results. |
| doi_str_mv | 10.1016/S1359-6454(99)00253-0 |
| format | Article |
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Tensile tests revealed that the strain rate was inversely proportional to the square of the grain size and to the second power of stress. The activation energy was close to that for grain boundary diffusion at 523–573 K, and was close to that for lattice diffusion at 598–673 K. From the analysis of the stress exponent, the grain size exponent and activation energy, it was suggested that the dominant diffusion process was influenced by temperature and grain size. It was demonstrated that the notion of effective diffusivity explained the experimental results.</description><identifier>ISSN: 1359-6454</identifier><identifier>EISSN: 1873-2453</identifier><identifier>DOI: 10.1016/S1359-6454(99)00253-0</identifier><language>eng</language><publisher>Oxford: Elsevier Ltd</publisher><subject>Alloys ; Applied sciences ; Condensed matter: structure, mechanical and thermal properties ; Deformation and plasticity (including yield, ductility, and superplasticity) ; DIFFUSION ; Exact sciences and technology ; FLOW STRESS ; GRAIN BOUNDARIES ; GRAIN SIZE ; MAGNESIUM BASE ALLOYS ; MATERIALS SCIENCE ; Mechanical and acoustical properties of condensed matter ; Mechanical properties ; Mechanical properties of solids ; Metals. 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Tensile tests revealed that the strain rate was inversely proportional to the square of the grain size and to the second power of stress. The activation energy was close to that for grain boundary diffusion at 523–573 K, and was close to that for lattice diffusion at 598–673 K. From the analysis of the stress exponent, the grain size exponent and activation energy, it was suggested that the dominant diffusion process was influenced by temperature and grain size. It was demonstrated that the notion of effective diffusivity explained the experimental results.</description><subject>Alloys</subject><subject>Applied sciences</subject><subject>Condensed matter: structure, mechanical and thermal properties</subject><subject>Deformation and plasticity (including yield, ductility, and superplasticity)</subject><subject>DIFFUSION</subject><subject>Exact sciences and technology</subject><subject>FLOW STRESS</subject><subject>GRAIN BOUNDARIES</subject><subject>GRAIN SIZE</subject><subject>MAGNESIUM BASE ALLOYS</subject><subject>MATERIALS SCIENCE</subject><subject>Mechanical and acoustical properties of condensed matter</subject><subject>Mechanical properties</subject><subject>Mechanical properties of solids</subject><subject>Metals. Metallurgy</subject><subject>Physics</subject><subject>PLASTICITY</subject><subject>STRAIN RATE</subject><subject>Superplasticity</subject><subject>TEMPERATURE DEPENDENCE</subject><issn>1359-6454</issn><issn>1873-2453</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1999</creationdate><recordtype>article</recordtype><recordid>eNqFkcFrFTEQxhdRsFb_hEJAEXvYmkl2sy8nKaVWoeBBvfQS5mUnbWQ3eSbZlvrXm-2reOwpyfD7Mt980zRHwE-Ag_r4HWSvW9X13QetjzkXvWz5s-YANoNsRdfL5_X-D3nZvMr5F-cgho4fNHfnzpEtLDpWaN5RwrIkYhhGdp3QB5b9H2IxsHJDbIyzDxgKG71zS_a1vEvRUs7MxcTyUvW7CXPxlrkp3rGqx8BOrxSwGa8DZb_MDKcp3r9uXjicMr15PA-bn5_Pf5x9aS-_XXw9O71sbaegtJILGmCQNGy2dgDJoXeKQHHHUfXaEsLgUIhRCS2d6wUQ1bdD1NstkZCHzdv9v7G6Mtn6QvbGxhDq0EbwGhYHXan3e6qO83uhXMzss6VpwkBxyUYo3emu4xXs96BNMedEzuySnzHdG-BmXYZ5WIZZkzZam4dlmFX37rEBZouTSxisz__FoDfAVcU-7TGqkdx6SqtjCpZGn1bDY_RPNPoLmsSe6w</recordid><startdate>19991026</startdate><enddate>19991026</enddate><creator>Watanabe, H.</creator><creator>Mukai, T.</creator><creator>Kohzu, M.</creator><creator>Tanabe, S.</creator><creator>Higashi, K.</creator><general>Elsevier Ltd</general><general>Elsevier Science</general><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>8BQ</scope><scope>8FD</scope><scope>JG9</scope><scope>OTOTI</scope></search><sort><creationdate>19991026</creationdate><title>Effect of temperature and grain size on the dominant diffusion process for superplastic flow in an AZ61 magnesium alloy</title><author>Watanabe, H. ; Mukai, T. ; Kohzu, M. ; Tanabe, S. ; Higashi, K.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c461t-302e7173e78bc713015f6e160f0a659cea17fa22d6293ff521eefa2faa9bbee23</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1999</creationdate><topic>Alloys</topic><topic>Applied sciences</topic><topic>Condensed matter: structure, mechanical and thermal properties</topic><topic>Deformation and plasticity (including yield, ductility, and superplasticity)</topic><topic>DIFFUSION</topic><topic>Exact sciences and technology</topic><topic>FLOW STRESS</topic><topic>GRAIN BOUNDARIES</topic><topic>GRAIN SIZE</topic><topic>MAGNESIUM BASE ALLOYS</topic><topic>MATERIALS SCIENCE</topic><topic>Mechanical and acoustical properties of condensed matter</topic><topic>Mechanical properties</topic><topic>Mechanical properties of solids</topic><topic>Metals. Metallurgy</topic><topic>Physics</topic><topic>PLASTICITY</topic><topic>STRAIN RATE</topic><topic>Superplasticity</topic><topic>TEMPERATURE DEPENDENCE</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Watanabe, H.</creatorcontrib><creatorcontrib>Mukai, T.</creatorcontrib><creatorcontrib>Kohzu, M.</creatorcontrib><creatorcontrib>Tanabe, S.</creatorcontrib><creatorcontrib>Higashi, K.</creatorcontrib><creatorcontrib>Osaka Municipal Technical Research Inst., Morinomiya (JP)</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>METADEX</collection><collection>Technology Research Database</collection><collection>Materials Research Database</collection><collection>OSTI.GOV</collection><jtitle>Acta Materialia</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Watanabe, H.</au><au>Mukai, T.</au><au>Kohzu, M.</au><au>Tanabe, S.</au><au>Higashi, K.</au><aucorp>Osaka Municipal Technical Research Inst., Morinomiya (JP)</aucorp><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Effect of temperature and grain size on the dominant diffusion process for superplastic flow in an AZ61 magnesium alloy</atitle><jtitle>Acta Materialia</jtitle><date>1999-10-26</date><risdate>1999</risdate><volume>47</volume><issue>14</issue><spage>3753</spage><epage>3758</epage><pages>3753-3758</pages><issn>1359-6454</issn><eissn>1873-2453</eissn><abstract>The effect of temperature and grain size on superplastic flow was investigated using a relatively coarse-grained (∼20 μm) Mg–Al–Zn alloy for the inclusive understanding of the dominant diffusion process. Tensile tests revealed that the strain rate was inversely proportional to the square of the grain size and to the second power of stress. The activation energy was close to that for grain boundary diffusion at 523–573 K, and was close to that for lattice diffusion at 598–673 K. From the analysis of the stress exponent, the grain size exponent and activation energy, it was suggested that the dominant diffusion process was influenced by temperature and grain size. It was demonstrated that the notion of effective diffusivity explained the experimental results.</abstract><cop>Oxford</cop><pub>Elsevier Ltd</pub><doi>10.1016/S1359-6454(99)00253-0</doi><tpages>6</tpages></addata></record> |
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| ispartof | Acta Materialia, 1999-10, Vol.47 (14), p.3753-3758 |
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| subjects | Alloys Applied sciences Condensed matter: structure, mechanical and thermal properties Deformation and plasticity (including yield, ductility, and superplasticity) DIFFUSION Exact sciences and technology FLOW STRESS GRAIN BOUNDARIES GRAIN SIZE MAGNESIUM BASE ALLOYS MATERIALS SCIENCE Mechanical and acoustical properties of condensed matter Mechanical properties Mechanical properties of solids Metals. Metallurgy Physics PLASTICITY STRAIN RATE Superplasticity TEMPERATURE DEPENDENCE |
| title | Effect of temperature and grain size on the dominant diffusion process for superplastic flow in an AZ61 magnesium alloy |
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