Coarsening of Plate-Like C15–Al2Ca Precipitates in a Mg–Al–Ca Alloy
The coarsening kinetics of the fine C15–Al2Ca Laves phase with a plate-like morphology, which precipitated within the primary α-Mg grains, were investigated for the Mg–5Al–1.5Ca alloy aged at 523 K. The Al2Ca precipitate coarsened with remaining coherency in the aging time below 300 h, and the quant...
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| Veröffentlicht in: | Journal of the Japan Institute of Metals and Materials 2019/08/01, Vol.83(8), pp.282-287 |
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| creator | Kashiwase, Sakiko Unekawa, Mariko Hisazawa, Hiromu Terada, Yoshihiro |
| description | The coarsening kinetics of the fine C15–Al2Ca Laves phase with a plate-like morphology, which precipitated within the primary α-Mg grains, were investigated for the Mg–5Al–1.5Ca alloy aged at 523 K. The Al2Ca precipitate coarsened with remaining coherency in the aging time below 300 h, and the quantitative relationship was obtained between precipitate length, l, and aging time, t, as follows; l ∝ t 0.23. By contrast, the α/C15 coherent interface turned to the semi-coherent one by the introduction of misfit dislocations on the planar surface of the precipitates in the aging time above 300 h, which resulted in the promotion of Al2Ca coarsening. The Al2Ca phase was deduced to precipitate through a nucleation and growth mechanism rather than spinodal decomposition, and its coarsening was explained using the terrace-ledge-kink mechanism. The aspect ratio of Al2Ca precipitates was predominantly decided by the aging temperature, and it decreased at higher aging temperatures. |
| doi_str_mv | 10.2320/jinstmet.J2019022 |
| format | Article |
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The Al2Ca precipitate coarsened with remaining coherency in the aging time below 300 h, and the quantitative relationship was obtained between precipitate length, l, and aging time, t, as follows; l ∝ t 0.23. By contrast, the α/C15 coherent interface turned to the semi-coherent one by the introduction of misfit dislocations on the planar surface of the precipitates in the aging time above 300 h, which resulted in the promotion of Al2Ca coarsening. The Al2Ca phase was deduced to precipitate through a nucleation and growth mechanism rather than spinodal decomposition, and its coarsening was explained using the terrace-ledge-kink mechanism. The aspect ratio of Al2Ca precipitates was predominantly decided by the aging temperature, and it decreased at higher aging temperatures.</description><identifier>ISSN: 0021-4876</identifier><identifier>EISSN: 1880-6880</identifier><identifier>DOI: 10.2320/jinstmet.J2019022</identifier><language>jpn</language><publisher>Sendai: The Japan Institute of Metals and Materials</publisher><subject>Aging ; Aspect ratio ; Calcium ; Chemical precipitation ; Coarsening ; Coherence ; coherency ; Dislocations ; high-resolution transmission electron microscopy (HRTEM) ; Laves phase ; magnesium alloy ; Magnesium base alloys ; microstructure ; Misfit dislocations ; Morphology ; Nucleation ; Precipitates ; Spinodal decomposition</subject><ispartof>Journal of the Japan Institute of Metals and Materials, 2019/08/01, Vol.83(8), pp.282-287</ispartof><rights>2019 The Japan Institute of Metals and Materials</rights><rights>Copyright Japan Science and Technology Agency 2019</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><cites>FETCH-LOGICAL-c289t-c4e41bb696ce74d1165760a9b29e4de0e8fe800e5503acf4ec1bf94a109ca2733</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,776,780,1877,27901,27902</link.rule.ids></links><search><creatorcontrib>Kashiwase, Sakiko</creatorcontrib><creatorcontrib>Unekawa, Mariko</creatorcontrib><creatorcontrib>Hisazawa, Hiromu</creatorcontrib><creatorcontrib>Terada, Yoshihiro</creatorcontrib><title>Coarsening of Plate-Like C15–Al2Ca Precipitates in a Mg–Al–Ca Alloy</title><title>Journal of the Japan Institute of Metals and Materials</title><addtitle>J. Japan Inst. Metals and Materials</addtitle><description>The coarsening kinetics of the fine C15–Al2Ca Laves phase with a plate-like morphology, which precipitated within the primary α-Mg grains, were investigated for the Mg–5Al–1.5Ca alloy aged at 523 K. The Al2Ca precipitate coarsened with remaining coherency in the aging time below 300 h, and the quantitative relationship was obtained between precipitate length, l, and aging time, t, as follows; l ∝ t 0.23. By contrast, the α/C15 coherent interface turned to the semi-coherent one by the introduction of misfit dislocations on the planar surface of the precipitates in the aging time above 300 h, which resulted in the promotion of Al2Ca coarsening. The Al2Ca phase was deduced to precipitate through a nucleation and growth mechanism rather than spinodal decomposition, and its coarsening was explained using the terrace-ledge-kink mechanism. The aspect ratio of Al2Ca precipitates was predominantly decided by the aging temperature, and it decreased at higher aging temperatures.</description><subject>Aging</subject><subject>Aspect ratio</subject><subject>Calcium</subject><subject>Chemical precipitation</subject><subject>Coarsening</subject><subject>Coherence</subject><subject>coherency</subject><subject>Dislocations</subject><subject>high-resolution transmission electron microscopy (HRTEM)</subject><subject>Laves phase</subject><subject>magnesium alloy</subject><subject>Magnesium base alloys</subject><subject>microstructure</subject><subject>Misfit dislocations</subject><subject>Morphology</subject><subject>Nucleation</subject><subject>Precipitates</subject><subject>Spinodal decomposition</subject><issn>0021-4876</issn><issn>1880-6880</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2019</creationdate><recordtype>article</recordtype><recordid>eNpFkMFOwzAQRC0EElXpB3CLxDll10lc-1hFUIqK6AHOluNuikuaFDs99MY_8Id8CSml5TJzmHm70jB2jTDkCYfblatDu6Z2-MgBFXB-xnooJcSik3PWA-AYp3IkLtkgBFcAgBIoQPXYNG-MD1S7ehk1ZTSvTEvxzL1TlGP2_fk1rnhuorkn6zau7cIQuToy0dPyN-yki8dV1eyu2EVpqkCDP--z1_u7l_whnj1Ppvl4FlsuVRvblFIsCqGEpVG6QBTZSIBRBVeULghIliQBKMsgMbZMyWJRqtQgKGv4KEn67OZwd-Objy2FVq-ara-7l5pzIVSGiLJr4aFlfROCp1JvvFsbv9MIej-aPo6mj6N1zOTArEJrlnQijG-dreifkImWezmSp4Z9M15TnfwA2up8Ow</recordid><startdate>20190101</startdate><enddate>20190101</enddate><creator>Kashiwase, Sakiko</creator><creator>Unekawa, Mariko</creator><creator>Hisazawa, Hiromu</creator><creator>Terada, Yoshihiro</creator><general>The Japan Institute of Metals and Materials</general><general>Japan Science and Technology Agency</general><scope>AAYXX</scope><scope>CITATION</scope><scope>8BQ</scope><scope>8FD</scope><scope>JG9</scope></search><sort><creationdate>20190101</creationdate><title>Coarsening of Plate-Like C15–Al2Ca Precipitates in a Mg–Al–Ca Alloy</title><author>Kashiwase, Sakiko ; Unekawa, Mariko ; Hisazawa, Hiromu ; Terada, Yoshihiro</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c289t-c4e41bb696ce74d1165760a9b29e4de0e8fe800e5503acf4ec1bf94a109ca2733</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>jpn</language><creationdate>2019</creationdate><topic>Aging</topic><topic>Aspect ratio</topic><topic>Calcium</topic><topic>Chemical precipitation</topic><topic>Coarsening</topic><topic>Coherence</topic><topic>coherency</topic><topic>Dislocations</topic><topic>high-resolution transmission electron microscopy (HRTEM)</topic><topic>Laves phase</topic><topic>magnesium alloy</topic><topic>Magnesium base alloys</topic><topic>microstructure</topic><topic>Misfit dislocations</topic><topic>Morphology</topic><topic>Nucleation</topic><topic>Precipitates</topic><topic>Spinodal decomposition</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Kashiwase, Sakiko</creatorcontrib><creatorcontrib>Unekawa, Mariko</creatorcontrib><creatorcontrib>Hisazawa, Hiromu</creatorcontrib><creatorcontrib>Terada, Yoshihiro</creatorcontrib><collection>CrossRef</collection><collection>METADEX</collection><collection>Technology Research Database</collection><collection>Materials Research Database</collection><jtitle>Journal of the Japan Institute of Metals and Materials</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Kashiwase, Sakiko</au><au>Unekawa, Mariko</au><au>Hisazawa, Hiromu</au><au>Terada, Yoshihiro</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Coarsening of Plate-Like C15–Al2Ca Precipitates in a Mg–Al–Ca Alloy</atitle><jtitle>Journal of the Japan Institute of Metals and Materials</jtitle><addtitle>J. Japan Inst. Metals and Materials</addtitle><date>2019-01-01</date><risdate>2019</risdate><volume>83</volume><issue>8</issue><spage>282</spage><epage>287</epage><pages>282-287</pages><issn>0021-4876</issn><eissn>1880-6880</eissn><abstract>The coarsening kinetics of the fine C15–Al2Ca Laves phase with a plate-like morphology, which precipitated within the primary α-Mg grains, were investigated for the Mg–5Al–1.5Ca alloy aged at 523 K. The Al2Ca precipitate coarsened with remaining coherency in the aging time below 300 h, and the quantitative relationship was obtained between precipitate length, l, and aging time, t, as follows; l ∝ t 0.23. By contrast, the α/C15 coherent interface turned to the semi-coherent one by the introduction of misfit dislocations on the planar surface of the precipitates in the aging time above 300 h, which resulted in the promotion of Al2Ca coarsening. The Al2Ca phase was deduced to precipitate through a nucleation and growth mechanism rather than spinodal decomposition, and its coarsening was explained using the terrace-ledge-kink mechanism. The aspect ratio of Al2Ca precipitates was predominantly decided by the aging temperature, and it decreased at higher aging temperatures.</abstract><cop>Sendai</cop><pub>The Japan Institute of Metals and Materials</pub><doi>10.2320/jinstmet.J2019022</doi><tpages>6</tpages><oa>free_for_read</oa></addata></record> |
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| source | J-STAGE Free; Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals |
| subjects | Aging Aspect ratio Calcium Chemical precipitation Coarsening Coherence coherency Dislocations high-resolution transmission electron microscopy (HRTEM) Laves phase magnesium alloy Magnesium base alloys microstructure Misfit dislocations Morphology Nucleation Precipitates Spinodal decomposition |
| title | Coarsening of Plate-Like C15–Al2Ca Precipitates in a Mg–Al–Ca Alloy |
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