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The mechanism of protection of molten magnesium by cover gas mixtures containing sulphur hexafluoride 六氟化硫覆盖气体混合物保护熔融镁的机理
Journal of Light Metals Pub Date : 2002-02-01 DOI: 10.1016/S1471-5317(02)00012-3
S.P Cashion , N.J Ricketts , P.C Hayes
{"title":"The mechanism of protection of molten magnesium by cover gas mixtures containing sulphur hexafluoride","authors":"S.P Cashion ,&nbsp;N.J Ricketts ,&nbsp;P.C Hayes","doi":"10.1016/S1471-5317(02)00012-3","DOIUrl":"https://doi.org/10.1016/S1471-5317(02)00012-3","url":null,"abstract":"<div><p>Experimental studies have been undertaken, involving in situ observations of the interaction between cover gas mixtures and molten magnesium. It has been shown that, in the presence of sulphur hexafluoride (SF<sub>6</sub>), the contact angle between solid MgO and molten magnesium is reduced, resulting in the wetting of MgO by magnesium metal. In contrast, it was observed that the absence of SF<sub>6</sub> results in a large contact angle, poor wetting of the MgO by magnesium metal and a non-adherent surface film. It is proposed that the formation of an adherent, protective surface film under a cover gas mixture containing SF<sub>6</sub> is due to capillary forces acting within the film.</p></div>","PeriodicalId":100798,"journal":{"name":"Journal of Light Metals","volume":"2 1","pages":"Pages 43-47"},"PeriodicalIF":0.0,"publicationDate":"2002-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1471-5317(02)00012-3","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72108604","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 51
Volume 1 Contents/Author/Subject Index 第一卷目录/作者/主题索引
Journal of Light Metals Pub Date : 2001-11-01 DOI: 10.1016/S1471-5317(02)00007-X
{"title":"Volume 1 Contents/Author/Subject Index","authors":"","doi":"10.1016/S1471-5317(02)00007-X","DOIUrl":"https://doi.org/10.1016/S1471-5317(02)00007-X","url":null,"abstract":"","PeriodicalId":100798,"journal":{"name":"Journal of Light Metals","volume":"1 4","pages":"Pages I-VI"},"PeriodicalIF":0.0,"publicationDate":"2001-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1471-5317(02)00007-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72110107","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Mechanisms of eutectic solidification in Al–Si alloys modified with Ba, Ca, Y and Yb Ba、Ca、Y和Yb改性Al–Si合金的共晶凝固机制
Journal of Light Metals Pub Date : 2001-11-01 DOI: 10.1016/S1471-5317(02)00005-6
K. Nogita, A. Knuutinen, S.D. McDonald, A.K. Dahle
{"title":"Mechanisms of eutectic solidification in Al–Si alloys modified with Ba, Ca, Y and Yb","authors":"K. Nogita,&nbsp;A. Knuutinen,&nbsp;S.D. McDonald,&nbsp;A.K. Dahle","doi":"10.1016/S1471-5317(02)00005-6","DOIUrl":"https://doi.org/10.1016/S1471-5317(02)00005-6","url":null,"abstract":"<div><p><span>The eutectic solidification mechanisms in an A356.0 (Al–7%Si–Mg) alloy modified by barium, calcium, yttrium and </span>ytterbium have been determined. The crystallographic orientations of aluminium in the eutectic and the surrounding aluminium dendrites were measured by electron backscattering diffraction mapping, and samples were also quenched at different stages during the eutectic arrest and examined by optical microscopy. The combination of these two techniques shows that each of the elements added promote heterogeneous nucleation of eutectic grains in the interdendritic liquid, while the aluminium in the unmodified alloy grows epitaxially from the dendrites. Furthermore, calcium and yttrium result in a strong dependency of eutectic solidification on the thermal gradient, i.e. the eutectic evolves from the walls towards the centre of the sample on a macro-scale. These differences in eutectic solidification mode show a correlation with some thermal characteristics of the eutectic arrest.</p></div>","PeriodicalId":100798,"journal":{"name":"Journal of Light Metals","volume":"1 4","pages":"Pages 219-228"},"PeriodicalIF":0.0,"publicationDate":"2001-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1471-5317(02)00005-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72115451","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 81
Effect of key alloying elements on the feeding characteristics of aluminum–silicon casting alloys 关键合金元素对铝硅铸造合金进料特性的影响
Journal of Light Metals Pub Date : 2001-11-01 DOI: 10.1016/S1471-5317(02)00002-0
M. Dash, M. Makhlouf
{"title":"Effect of key alloying elements on the feeding characteristics of aluminum–silicon casting alloys","authors":"M. Dash, M. Makhlouf","doi":"10.1016/S1471-5317(02)00002-0","DOIUrl":"https://doi.org/10.1016/S1471-5317(02)00002-0","url":null,"abstract":"","PeriodicalId":100798,"journal":{"name":"Journal of Light Metals","volume":"8 5","pages":"251-265"},"PeriodicalIF":0.0,"publicationDate":"2001-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91433166","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 72
Mechanisms of eutectic solidification in Al–Si alloys modified with Ba, Ca, Y and Yb Ba、Ca、Y、Yb改性Al-Si合金共晶凝固机理
Journal of Light Metals Pub Date : 2001-11-01 DOI: 10.1016/S1471-5317(02)00005-6
K. Nogita, A. Knuutinen, S. McDonald, A. Dahle
{"title":"Mechanisms of eutectic solidification in Al–Si alloys modified with Ba, Ca, Y and Yb","authors":"K. Nogita, A. Knuutinen, S. McDonald, A. Dahle","doi":"10.1016/S1471-5317(02)00005-6","DOIUrl":"https://doi.org/10.1016/S1471-5317(02)00005-6","url":null,"abstract":"","PeriodicalId":100798,"journal":{"name":"Journal of Light Metals","volume":"14 1","pages":"219-228"},"PeriodicalIF":0.0,"publicationDate":"2001-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89215168","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 80
Porosity formation in aluminium alloy A356 modified with Ba, Ca, Y and Yb Ba、Ca、Y、Yb改性A356铝合金孔隙的形成
Journal of Light Metals Pub Date : 2001-11-01 DOI: 10.1016/S1471-5317(02)00006-8
A. Knuutinen, K. Nogita, S. McDonald, A. Dahle
{"title":"Porosity formation in aluminium alloy A356 modified with Ba, Ca, Y and Yb","authors":"A. Knuutinen, K. Nogita, S. McDonald, A. Dahle","doi":"10.1016/S1471-5317(02)00006-8","DOIUrl":"https://doi.org/10.1016/S1471-5317(02)00006-8","url":null,"abstract":"","PeriodicalId":100798,"journal":{"name":"Journal of Light Metals","volume":"1 1","pages":"241-249"},"PeriodicalIF":0.0,"publicationDate":"2001-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90120072","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 49
Modification of Al–Si alloys with Ba, Ca, Y and Yb Ba、Ca、Y和Yb对Al-Si合金的改性
Journal of Light Metals Pub Date : 2001-11-01 DOI: 10.1016/S1471-5317(02)00004-4
A. Knuutinen, K. Nogita, S.D. McDonald, A.K. Dahle
{"title":"Modification of Al–Si alloys with Ba, Ca, Y and Yb","authors":"A. Knuutinen,&nbsp;K. Nogita,&nbsp;S.D. McDonald,&nbsp;A.K. Dahle","doi":"10.1016/S1471-5317(02)00004-4","DOIUrl":"https://doi.org/10.1016/S1471-5317(02)00004-4","url":null,"abstract":"<div><p>Modification of Al–Si alloys is known to result in a depression of the eutectic arrest temperature. It has been suggested that a larger depression is related to increased modification. The effects of different concentrations of separate additions of Ba, Ca, Y and Yb on the eutectic arrest in an A356.0 (Al–7%Si–Mg) alloy have been studied by thermal analysis. All of these elements cause a depression of the eutectic arrest, however Ba and Ca result in fibrous eutectic Si while Y and Yb result in a refined plate-like eutectic silicon. Analysis of the effects of the elements on eutectic nucleation and growth temperatures and the recalescence shows two different trends. Addition of Ba and Yb both causes linear changes with increased concentration, while addition of Ca and Y result in an instantaneous effect with the first addition and no further significant changes with increased concentration.</p></div>","PeriodicalId":100798,"journal":{"name":"Journal of Light Metals","volume":"1 4","pages":"Pages 229-240"},"PeriodicalIF":0.0,"publicationDate":"2001-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1471-5317(02)00004-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72110106","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 218
The aluminum–silicon eutectic reaction: mechanisms and crystallography 铝硅共晶反应:机理与晶体学
Journal of Light Metals Pub Date : 2001-11-01 DOI: 10.1016/S1471-5317(02)00003-2
M. Makhlouf, H. Guthy
{"title":"The aluminum–silicon eutectic reaction: mechanisms and crystallography","authors":"M. Makhlouf, H. Guthy","doi":"10.1016/S1471-5317(02)00003-2","DOIUrl":"https://doi.org/10.1016/S1471-5317(02)00003-2","url":null,"abstract":"","PeriodicalId":100798,"journal":{"name":"Journal of Light Metals","volume":"19 1","pages":"199-218"},"PeriodicalIF":0.0,"publicationDate":"2001-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88046789","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 218
Porosity formation in aluminium alloy A356 modified with Ba, Ca, Y and Yb Ba、Ca、Y和Yb改性A356铝合金中气孔的形成
Journal of Light Metals Pub Date : 2001-11-01 DOI: 10.1016/S1471-5317(02)00006-8
A. Knuutinen, K. Nogita, S.D. McDonald, A.K. Dahle
{"title":"Porosity formation in aluminium alloy A356 modified with Ba, Ca, Y and Yb","authors":"A. Knuutinen,&nbsp;K. Nogita,&nbsp;S.D. McDonald,&nbsp;A.K. Dahle","doi":"10.1016/S1471-5317(02)00006-8","DOIUrl":"https://doi.org/10.1016/S1471-5317(02)00006-8","url":null,"abstract":"<div><p><span>An increased level of porosity is normally reported to accompany modification of Al–Si alloys. In this study, the effects of additions of barium, calcium, yttrium and </span>ytterbium on porosity formation in an A356.0 (Al–7%Si–Mg) alloy are examined. The permanent mould casting consisted of a vertical plate connected directly to a runner at a hot-spot junction. Casting defects observed include surface shrinkage and internal porosity in the hot spot and also hot tearing of the casting and runner. All additions increased the porosity level compared to the unmodified alloy and it increased with increased addition level. The results show that additions of Ca and Y caused porosity to become increasingly concentrated in the hot spot. Additions of Ba and Yb resulted in small, round, dispersed porosity. When porosity formation is considered based on the feeding mechanisms, particularly interdendritic feeding, it is possible to rationalise the effects of the elements on porosity distribution based on their impact on the eutectic solidification mode. In Ca and Y containing alloys the eutectic evolves from the surface towards the centre of the hot spot, while heterogeneous nucleation of eutectic grains across the hot spot occurs with additions of Ba and Yb.</p></div>","PeriodicalId":100798,"journal":{"name":"Journal of Light Metals","volume":"1 4","pages":"Pages 241-249"},"PeriodicalIF":0.0,"publicationDate":"2001-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1471-5317(02)00006-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72115449","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 48
Effect of key alloying elements on the feeding characteristics of aluminum–silicon casting alloys 关键合金元素对铝硅铸造合金进给特性的影响
Journal of Light Metals Pub Date : 2001-11-01 DOI: 10.1016/S1471-5317(02)00002-0
Manas Dash, Makhlouf Makhlouf
{"title":"Effect of key alloying elements on the feeding characteristics of aluminum–silicon casting alloys","authors":"Manas Dash,&nbsp;Makhlouf Makhlouf","doi":"10.1016/S1471-5317(02)00002-0","DOIUrl":"https://doi.org/10.1016/S1471-5317(02)00002-0","url":null,"abstract":"<div><p>The most common and serious defect in aluminum castings is porosity, which is a result of two phenomena, insufficient feeding and/or hydrogen precipitation during solidification. These defects cause costly scrap loss and limit the use of castings in critical, high-strength applications. In this paper, the effect of alloying elements Si, Fe, Mg, Mn, Cu, Sr, and Ti as well as the cooling rate on the amount of porosity retained in aluminum castings has been quantified. The density of samples taken from locations along the length of a plate cast in sand is measured using Archimedes' principle following <em>ASTM</em><span> procedures. Hot isostatically pressed samples are used to determine the theoretical density of each of the alloys. The percent porosity is calculated from the difference between theoretical and measured density. The relative contribution of each of the alloying elements to porosity formation is calculated using analysis of variance. Scanning electron microscopy of some samples is performed to correlate the results obtained from analysis of variance to the intermetallics formed. It is observed that the morphology of the intermetallics greatly affects feedability of the alloy.</span></p></div>","PeriodicalId":100798,"journal":{"name":"Journal of Light Metals","volume":"1 4","pages":"Pages 251-265"},"PeriodicalIF":0.0,"publicationDate":"2001-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1471-5317(02)00002-0","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72110108","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 72
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