A study of the microstructure of nanocrystalline Al–Ti alloys synthesized by ball milling in a hydrogen atmosphere and hot extrusion
Nanocrystalline Al–Ti alloy powders were produced by reactive ball milling (RBM) in a hydrogen atmosphere and its microstructure consisted of nano-sized Al and nano-sized TiH 2. Thermal analysis of as-milled powders showed that the decomposition of TiH 2 and the subsequent formation of Al 3Ti occurr...
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| Veröffentlicht in: | Journal of alloys and compounds 1999-09, Vol.291 (1), p.312-321 |
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| creator | Moon, Kyoung Il Lee, Kyung Sub |
| description | Nanocrystalline Al–Ti alloy powders were produced by reactive ball milling (RBM) in a hydrogen atmosphere and its microstructure consisted of nano-sized Al and nano-sized TiH
2. Thermal analysis of as-milled powders showed that the decomposition of TiH
2 and the subsequent formation of Al
3Ti occurred at 370–480°C. The powder was consolidated by hot extrusion at 500°C. The grain size of as-extruded specimens was about 50–100 nm. The hardness of Al-5 at.%Ti specimens synthesized by RBM and subsequent hot extrusion was 25–75% higher than that of Al-8 wt.%Ti alloys produced by mechanical alloying (MA) in Ar atmosphere and hot extrusion. Room temperature and high temperature (300, 400, 500°C) tensile strength of RBM Al-5 at.%Ti alloys were superior to those of MA Al-8 wt.%Ti alloys. The strength in these alloys appeared to be related to a large extent to the very fine grain size. The ductility of RBM alloys decreased with grain refinement. It is possible that the deterioration in ductility of nanocomposite Al–Ti alloys has to be attributed to the increase of the interface area between Al and Al
3Ti and its high energy. SEM fractograph showed that fracture progressed intergranularly. |
| doi_str_mv | 10.1016/S0925-8388(99)00299-6 |
| format | Article |
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2. Thermal analysis of as-milled powders showed that the decomposition of TiH
2 and the subsequent formation of Al
3Ti occurred at 370–480°C. The powder was consolidated by hot extrusion at 500°C. The grain size of as-extruded specimens was about 50–100 nm. The hardness of Al-5 at.%Ti specimens synthesized by RBM and subsequent hot extrusion was 25–75% higher than that of Al-8 wt.%Ti alloys produced by mechanical alloying (MA) in Ar atmosphere and hot extrusion. Room temperature and high temperature (300, 400, 500°C) tensile strength of RBM Al-5 at.%Ti alloys were superior to those of MA Al-8 wt.%Ti alloys. The strength in these alloys appeared to be related to a large extent to the very fine grain size. The ductility of RBM alloys decreased with grain refinement. It is possible that the deterioration in ductility of nanocomposite Al–Ti alloys has to be attributed to the increase of the interface area between Al and Al
3Ti and its high energy. SEM fractograph showed that fracture progressed intergranularly.</description><identifier>ISSN: 0925-8388</identifier><identifier>EISSN: 1873-4669</identifier><identifier>DOI: 10.1016/S0925-8388(99)00299-6</identifier><language>eng</language><publisher>Lausanne: Elsevier B.V</publisher><subject>Applied sciences ; Cross-disciplinary physics: materials science; rheology ; Deformation, plasticity, and creep ; Exact sciences and technology ; Hot extrusion ; Materials science ; Metals, semimetals and alloys ; Metals. Metallurgy ; Nanocrystalline Al–Ti alloy ; Nanoscale materials and structures: fabrication and characterization ; Physics ; Reactive ball milling ; Specific materials ; Tension test ; Titanium hydride ; Treatment of materials and its effects on microstructure and properties</subject><ispartof>Journal of alloys and compounds, 1999-09, Vol.291 (1), p.312-321</ispartof><rights>1999</rights><rights>1999 INIST-CNRS</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c433t-8ceaa4e0d4ee582fed6d710ebf4e00baf19b1165b3bdb857dba98704a705c82c3</citedby><cites>FETCH-LOGICAL-c433t-8ceaa4e0d4ee582fed6d710ebf4e00baf19b1165b3bdb857dba98704a705c82c3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://www.sciencedirect.com/science/article/pii/S0925838899002996$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,776,780,3536,27903,27904,65309</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=1943017$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>Moon, Kyoung Il</creatorcontrib><creatorcontrib>Lee, Kyung Sub</creatorcontrib><title>A study of the microstructure of nanocrystalline Al–Ti alloys synthesized by ball milling in a hydrogen atmosphere and hot extrusion</title><title>Journal of alloys and compounds</title><description>Nanocrystalline Al–Ti alloy powders were produced by reactive ball milling (RBM) in a hydrogen atmosphere and its microstructure consisted of nano-sized Al and nano-sized TiH
2. Thermal analysis of as-milled powders showed that the decomposition of TiH
2 and the subsequent formation of Al
3Ti occurred at 370–480°C. The powder was consolidated by hot extrusion at 500°C. The grain size of as-extruded specimens was about 50–100 nm. The hardness of Al-5 at.%Ti specimens synthesized by RBM and subsequent hot extrusion was 25–75% higher than that of Al-8 wt.%Ti alloys produced by mechanical alloying (MA) in Ar atmosphere and hot extrusion. Room temperature and high temperature (300, 400, 500°C) tensile strength of RBM Al-5 at.%Ti alloys were superior to those of MA Al-8 wt.%Ti alloys. The strength in these alloys appeared to be related to a large extent to the very fine grain size. The ductility of RBM alloys decreased with grain refinement. It is possible that the deterioration in ductility of nanocomposite Al–Ti alloys has to be attributed to the increase of the interface area between Al and Al
3Ti and its high energy. SEM fractograph showed that fracture progressed intergranularly.</description><subject>Applied sciences</subject><subject>Cross-disciplinary physics: materials science; rheology</subject><subject>Deformation, plasticity, and creep</subject><subject>Exact sciences and technology</subject><subject>Hot extrusion</subject><subject>Materials science</subject><subject>Metals, semimetals and alloys</subject><subject>Metals. Metallurgy</subject><subject>Nanocrystalline Al–Ti alloy</subject><subject>Nanoscale materials and structures: fabrication and characterization</subject><subject>Physics</subject><subject>Reactive ball milling</subject><subject>Specific materials</subject><subject>Tension test</subject><subject>Titanium hydride</subject><subject>Treatment of materials and its effects on microstructure and properties</subject><issn>0925-8388</issn><issn>1873-4669</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1999</creationdate><recordtype>article</recordtype><recordid>eNqFkM9u1DAYxC1EJZaWR0DyASF6CNhxnNgntKpaQKrEgXK2_OdL1yhrL7aDCCdOvEDfkCfB6VZw5GR79JsZeRB6TslrSmj_5hORLW8EE-KVlOeEtFI2_SO0oWJgTdf38jHa_EWeoKc5fyGEUMnoBv3a4lxmt-A44rIDvPc2xVzSbMucYFWDDtGmJRc9TT4A3k6_f97deFyfcck4L6H6sv8BDpsFmyrXkBW9xT5gjXeLS_EW6rXsYz7soMbq4PAuFgzfa1P2MZyhk1FPGZ49nKfo89XlzcX75vrjuw8X2-vGdoyVRljQugPiOgAu2hFc7wZKwIxVJEaPVBpKe26YcUbwwRktxUA6PRBuRWvZKXp5zD2k-HWGXNTeZwvTpAPEOat2oJz3nFWQH8F1jpxgVIfk9zotihK1rq7uV1frpEpKdb-66qvvxUOBzlZPY9LB-vzPLDtG6FCxt0cM6me_eUgqWw_BgvMJbFEu-v8U_QHQU5uC</recordid><startdate>19990927</startdate><enddate>19990927</enddate><creator>Moon, Kyoung Il</creator><creator>Lee, Kyung Sub</creator><general>Elsevier B.V</general><general>Elsevier</general><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7QF</scope><scope>8BQ</scope><scope>8FD</scope><scope>JG9</scope></search><sort><creationdate>19990927</creationdate><title>A study of the microstructure of nanocrystalline Al–Ti alloys synthesized by ball milling in a hydrogen atmosphere and hot extrusion</title><author>Moon, Kyoung Il ; Lee, Kyung Sub</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c433t-8ceaa4e0d4ee582fed6d710ebf4e00baf19b1165b3bdb857dba98704a705c82c3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1999</creationdate><topic>Applied sciences</topic><topic>Cross-disciplinary physics: materials science; rheology</topic><topic>Deformation, plasticity, and creep</topic><topic>Exact sciences and technology</topic><topic>Hot extrusion</topic><topic>Materials science</topic><topic>Metals, semimetals and alloys</topic><topic>Metals. Metallurgy</topic><topic>Nanocrystalline Al–Ti alloy</topic><topic>Nanoscale materials and structures: fabrication and characterization</topic><topic>Physics</topic><topic>Reactive ball milling</topic><topic>Specific materials</topic><topic>Tension test</topic><topic>Titanium hydride</topic><topic>Treatment of materials and its effects on microstructure and properties</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Moon, Kyoung Il</creatorcontrib><creatorcontrib>Lee, Kyung Sub</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Aluminium Industry Abstracts</collection><collection>METADEX</collection><collection>Technology Research Database</collection><collection>Materials Research Database</collection><jtitle>Journal of alloys and compounds</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Moon, Kyoung Il</au><au>Lee, Kyung Sub</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>A study of the microstructure of nanocrystalline Al–Ti alloys synthesized by ball milling in a hydrogen atmosphere and hot extrusion</atitle><jtitle>Journal of alloys and compounds</jtitle><date>1999-09-27</date><risdate>1999</risdate><volume>291</volume><issue>1</issue><spage>312</spage><epage>321</epage><pages>312-321</pages><issn>0925-8388</issn><eissn>1873-4669</eissn><abstract>Nanocrystalline Al–Ti alloy powders were produced by reactive ball milling (RBM) in a hydrogen atmosphere and its microstructure consisted of nano-sized Al and nano-sized TiH
2. Thermal analysis of as-milled powders showed that the decomposition of TiH
2 and the subsequent formation of Al
3Ti occurred at 370–480°C. The powder was consolidated by hot extrusion at 500°C. The grain size of as-extruded specimens was about 50–100 nm. The hardness of Al-5 at.%Ti specimens synthesized by RBM and subsequent hot extrusion was 25–75% higher than that of Al-8 wt.%Ti alloys produced by mechanical alloying (MA) in Ar atmosphere and hot extrusion. Room temperature and high temperature (300, 400, 500°C) tensile strength of RBM Al-5 at.%Ti alloys were superior to those of MA Al-8 wt.%Ti alloys. The strength in these alloys appeared to be related to a large extent to the very fine grain size. The ductility of RBM alloys decreased with grain refinement. It is possible that the deterioration in ductility of nanocomposite Al–Ti alloys has to be attributed to the increase of the interface area between Al and Al
3Ti and its high energy. SEM fractograph showed that fracture progressed intergranularly.</abstract><cop>Lausanne</cop><pub>Elsevier B.V</pub><doi>10.1016/S0925-8388(99)00299-6</doi><tpages>10</tpages></addata></record> |
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| ispartof | Journal of alloys and compounds, 1999-09, Vol.291 (1), p.312-321 |
| issn | 0925-8388 1873-4669 |
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| source | Elsevier ScienceDirect Journals |
| subjects | Applied sciences Cross-disciplinary physics: materials science rheology Deformation, plasticity, and creep Exact sciences and technology Hot extrusion Materials science Metals, semimetals and alloys Metals. Metallurgy Nanocrystalline Al–Ti alloy Nanoscale materials and structures: fabrication and characterization Physics Reactive ball milling Specific materials Tension test Titanium hydride Treatment of materials and its effects on microstructure and properties |
| title | A study of the microstructure of nanocrystalline Al–Ti alloys synthesized by ball milling in a hydrogen atmosphere and hot extrusion |
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