Mechanical properties and microstructure of aluminum alloy 2618 with Al3(Sc, Zr) phases

Yu, Kun; Li, Wenxian; Li, Songrui; Zhao, Jun

doi:10.1016/j.msea.2003.09.092

Cited by 113 publications

(31 citation statements)

References 7 publications

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“…The average hardness values obtained are in the range of 133.5 -135.5 HB. These average hardness values are relatively higher compared to the hardness value of the forged product of Al-Alloy 2618 with the temper condition of T-61 in which its hardness value is 115.0 HB [3,6] . Temper T-61 is a type of heat treatment in which Al-Alloy 2618 is solution heat treated and then artificially aged.…”

Section: Hardness Test and Analysismentioning

confidence: 69%

Penelitian Dan Analisis Metalurgi Pada Cacat Permukaan Lubang Utama Dari Komponen Paduan Aluminium Hasil Permesinan Untuk Bagian Sayap Pesawat Terbang (Aileron) [Metallurgical Assesment of Main Bore Surface Defect of A Machined Aluminum Alloy Aileron Block]

Adnyana¹

2017

metal.

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A newly machined aileron block was reportedly exhibiting several pits on its particular main bore area after it has been subjected to sulfuric anodizing process. This IntisariSebuah aileron block hasil proses permesinan dilaporkan memperlihatkan sejumlah sumuran pada dinding bagian dalam dari lubang utama setelah diberi proses anodisasi sulfurik. Aileron block yang cacat tersebut terbuat dari paduan aluminium AA 2618 hasil proses tempa dan dirancang untuk mengakomodasi pergerakan komponenkomponen di dalamnya yang terhubung dengan suatu mekanisme sehingga memungkinkan terjadi gerakan pada aileron di bagian sayap pesawat terbang. Untuk menentukan jenis dan faktor-faktor yang mungkin telah menyebabkan terjadinya cacat permukaan pada bagian lubang utama dari aileron block tersebut, maka diperlukan untuk melakukan pengujian dan analisis metalurgi. Sejumlah benda uji disiapkan untuk pengujian laboratoriumya itu terdiri dari uji makroskopik, analisa komposisi kimia, uji metalografi, uji kekerasan dan uji SEM (scanning electron microscopy) yang dilengkapi dengan analisa EDS (energy dispersive spectroscopy). Hasil pengujian dan analisis metalurgi yang diperoleh menunjukkan bahwa cacat permukaan yang terjadi pada dinding bagian lubang utama aileron block tersebut utamanya dipengaruhi oleh pembentukan endapan partikel (presipitat) berukuran besar di dalam matrik fasa aluminium aileron block tersebut. Pembentukan partikel/presipitat yang besar tersebut telah menurunkan ikatan koherensi dengan matrik fasa aluminium dan mengakibatkan pertikel tersebut mudah terlepas dari permukaan selama proses permesinan dan membentuk/meninggalkan sejumlah lubang sumuran di sana.Kata Kunci: Aileron block, paduan aluminium AA 2618 hasil tempa, cacat permukaan, presipitat, sumuran

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Section: Hardness Test and Analysismentioning

confidence: 69%

Penelitian Dan Analisis Metalurgi Pada Cacat Permukaan Lubang Utama Dari Komponen Paduan Aluminium Hasil Permesinan Untuk Bagian Sayap Pesawat Terbang (Aileron) [Metallurgical Assesment of Main Bore Surface Defect of A Machined Aluminum Alloy Aileron Block]

Adnyana¹

2017

metal.

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“…Raju et al [119] and Yu et al [120] independently observed cubic morphologies of A^Sci-jZr*) precipitates. By means of high-resolution electron microscopy, Fuller et al proposed a faceted structure whose facets were parallel to the (100) and (110) Recent studies revealed that A^Sci^Zr*) crystals consisted of a AI3SC core surrounded by a Zr-rich shell [118,121,122].…”

Section: Ahcscijzr) Phasementioning

confidence: 99%

Developing Sc and Zr containing Al-B C metal matrix composites for high temperature applications /

Lai¹

2011

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RESUMEDans cette étude, nous nous intéressons principalement au développement de la coulée, et au durcissement structrural des composites à matrice métallique AI-B4C pour des applications à haute temperature. Le scandium et le zirconium ont été introduits dans le système AI-B4C, comme éléments d'alliage, et leurs effets sur la microstrcture, la réponse au vieillissement, les propriétés mécaniques et la stabilité thermique ont été étudiés.Afin de réaliser cette étude, un microscope optique, un microscope électronique à balayage et un microscope électronique à transmission ont été utilisés dans le but d'observer la microstructure de brut de coulée et celle obtenue après vieillissement, d'analyser les réactions interfaciales, la distribution des éléments d'alliage entre l'interface et la matrice ainsi que pour examiner l'évolution des précipités lors de la couleé et le vieillissement.La réponse au vieillissement et le durcissement structural de la matrice ont été suivis par des mesures de dureté 'Vickers'. Les propriétés mécaniques et la stabilité thermique à long terme des composites contenant Se et Zr ont été évaluées en utilisant des essais de dureté Vickers et Rockwell ainsi que des essais de compression.Dans le premier chapitre de cette étude, des plaques de B4C ont été immergées dans l'aluminium liquide contenant Se, Zr et Ti afin d'étudier les réactions interfaciales entre le B4C et l'aluminium liquide. Les effets de Se, Zr et Ti à l'interface en terme d'apports individuels et combinés ont été examinés. Les résultats montrent que les trois éléments réagissent avec B4C et forment des couches interfaciales, qui agissent comme des barrières de diffusion, dans le but de limiter la décomposition du B4C dans l'aluminium liquide. Ainsi, les réactions interfaciales et les produits de réaction dans chaque système ont été identifiés. En combinant le Se, Zr et Ti, une grande quantité de Ti est enrichie à l'interface, qui non seulement offre une protection appropriée au B4C mais aussi une réduction de la consomation de Se et Zr à l'interface.Dans le second chapitre, le scandium et le zirconium ont été introduits dans le composite Al-15vol.% B4C, présaturé par Ti et huit composites à diférents teneurs en Se et Zr ont été préparés par couleé conventionelle. Il a été constaté que le scandium favorise les réactions interfaciales avec B4C qui consomme partiellement le Se. L'ajout de Se procure un durcissement structural considerable dans les conditions de couleé conventionnelle et du pic de veiellissement. Afin d'obtenir un durcissement equivalent de Se dans les alliages binaires, environ le double de la quantité de Se est nécessaire pour les composites AI-B4C. Par contre, aucun produit de réaction majeur de Zr n'a été trouvé aux interfaces. En effet, la majeure partie de Zr se concentre dans la matrice pour le durcissenent structurale. La combinaison de Se et Zr augmente de manière significative le durcissement structural. Deux types de précipités nanométriques, AI3SC et Al3(Sc, Zr), ont été observés dans la 11 microstructu...

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“…x Ti) may act as nucleation sites for the age-hardening phases during the aging process, ultimately leading to further improvement in strength. 139 ' 185 ' 186 According to a different study, 187 there is also a possibility that Zr modifies the S-phase precipitates due to the high binding energy (0.24±0.02 eV) between Zr atoms and vacancies in aluminum. As the Zr content increases, it is expected that the degree of improvement will also increase with it.…”

Section: >58mentioning

confidence: 99%

Influence of zirconium and scandium on the microstructure, tensile properties, and hot-tearing susceptibility of Al-2WT%Cu-based alloys /

Nabawy¹

2010

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In the second alloy category, seventeen alloy compositions were prepared, using different additions of Zr, Sc, Ti-B, Sr, Ag, and Si These alloys were further divided into four groups, namely, the Zr-Ti, Zr-Sr, Zr-Sc, and Si alloy groups. Tensile test bars (cooling rate 7°C/s) prepared from these alloys were solutionized for 8h at 490°C then age-hardened at temperatures of 180°C and 220°C for aging times of 2, 4, 6, 10,16, 24, and 48h, and 0.5,1, 1.5, 2, 4, 6, 10, 16, 24, and 48h, respectively. It was observed that combined additions of Zr-Ti Zr-Sr, or Zr-Sc refined the grain size of the base alloy considerably, from 219 um to 104-46 urn, since these elements form primary trialuminide intermetallics including Al3(Sci-x Zr x ), Al3(Sci-x -yZr x Tiy), and AlaZr which act as nucleation sites for o-Al grains, thereby producing fine non-dendritic structures. The refined non-dendritic morphology produced by the combined additions of Zr-Ti Zr-Sr, or Zr-Sc caused a reduction of about 65% in the amount of the AliCu phase in the base alloy, and a reduction in porosity of about 50%. The addition of 2 wt% Si also produced the same reduction levels in the amount of AfeCu and porosity, brought about by the increase in the Al-Si eutectic content. Age-hardening peaks were observed after aging for lOh and 24h at 180°C, and after aging for Ih and 2h at 220°C. The Zr-Sr and Zr-Ti alloy groups displayed the highest level of improvement in the tensile properties of the Al-2wt%Cu base alloy followed by the Zr-Sc and Si alloy groups, in that order. The 0.02wt%Sr-0.7wt%Zr containing alloy produced the highest ultimate tensile and yield strength values of 383 MPa and 326 MPa, respectively, after 4h of aging at 180°C. The strength of the base alloy increased in the Zr-Ti alloy group with an increase in Zr content from 0.15wt% to 0.7wt% after aging at 180°C for lOh. This increase may be variously attributed to Al$Zr and Al3(Zri. x Ti x ) dispersoids acting as heterogeneous nucleation sites for age-hardening phases; to the modifying action of Zr on the S' (AfeCuMg) phase; and to the action of Zr-Ti in producing a refined non-dendritic grain structure. Combined additions of Zr-Sr and Sr-Ti displayed the best elongation levels of all the alloys investigated, as witnessed by the 0.02wt%Sr-0.15wt%Ti-containing alloy and, 0.02wt%Sr-0.7wt%Zr-containing alloy. These improved levels may be the result of the modifying effects of Sr on o-Fe particles, as well as of the roles of Zr and Ti in producing a fine non-dendritic os-Al structure. The 0.02wt%Sr-0.15wt%Ti-containing alloy displayed the highest resistance to softening during aging at 220°C because of the respective modifying and refining effects of Sr and Ti on the microstructure.

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Mechanical properties and microstructure of aluminum alloy 2618 with Al3(Sc, Zr) phases

Cited by 113 publications

References 7 publications

Penelitian Dan Analisis Metalurgi Pada Cacat Permukaan Lubang Utama Dari Komponen Paduan Aluminium Hasil Permesinan Untuk Bagian Sayap Pesawat Terbang (Aileron) [Metallurgical Assesment of Main Bore Surface Defect of A Machined Aluminum Alloy Aileron Block]

Penelitian Dan Analisis Metalurgi Pada Cacat Permukaan Lubang Utama Dari Komponen Paduan Aluminium Hasil Permesinan Untuk Bagian Sayap Pesawat Terbang (Aileron) [Metallurgical Assesment of Main Bore Surface Defect of A Machined Aluminum Alloy Aileron Block]

Developing Sc and Zr containing Al-B C metal matrix composites for high temperature applications /

Influence of zirconium and scandium on the microstructure, tensile properties, and hot-tearing susceptibility of Al-2WT%Cu-based alloys /

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