Microstructure and property development in low density rapidly solidified Al?Li alloys

D. Sampath, R. Dashwood, H.B. McShane, T. Sheppard

Research output: Contribution to journalArticle

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Abstract

The development of microstructure and properties during the consolidation and heat treatment of low density rapidly solidified Al–Li alloys is discussed in this paper. The effects of Zr and Mn as ternary additions to a binary Al–3·5Li base are investigated, the additions being made in an attempt to improve the strength and fracture toughness of the base alloy. Microstructural evolution was closely monitored and the mechanical properties have been related to the changes in microstructure. Three rapidly solidified inert gas atomised powder alloys were prepared, namely, Al–3·5Li, Al–3·5Li–0·3Zr, and Al–3·5Li–0·7Mn. These alloys were consolidated via cold compaction followed by hot extrusion. Microstructural development from the powder through consolidation to the final heat treated product was investigated using a combination of X-ray diffraction, differential scanning calorimetry, and transmission electron microscopy. Tensile properties and fracture toughness were evaluated in the as extruded and heat treated conditions. It was found that by careful selection of the solution treatment conditions a desirable distribution of cross-slip promoting hard particles could be achieved in both the transition element containing alloys. These dispersoids were identified as being the metastable ZrAl3 and stable MnAl6 phases. The addition of transition elements was found to enhance the yield strengths of the alloy with increases up to 20% exhibited in the underaged condition. With respect to the fracture toughness of the materials, the Mn additions had the most pronounced effect, producing an improvement of almost 100% in this property.
Original languageEnglish
Pages (from-to)218-227
Number of pages10
JournalMaterials Science and Technology (United Kingdom)
Volume9
Issue number3
DOIs
Publication statusPublished - 1993

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microstructure
Microstructure
Transition Elements
fracture strength
Fracture toughness
consolidation
toughness
Consolidation
Powders
transition metals
Noble Gases
heat
solidified gases
tensile properties
Microstructural evolution
yield strength
Inert gases
Tensile properties
Extrusion
Yield stress

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Microstructure and property development in low density rapidly solidified Al?Li alloys. / Sampath, D.; Dashwood, R.; McShane, H.B.; Sheppard, T.

In: Materials Science and Technology (United Kingdom), Vol. 9, No. 3, 1993, p. 218-227.

Research output: Contribution to journalArticle

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abstract = "The development of microstructure and properties during the consolidation and heat treatment of low density rapidly solidified Al–Li alloys is discussed in this paper. The effects of Zr and Mn as ternary additions to a binary Al–3·5Li base are investigated, the additions being made in an attempt to improve the strength and fracture toughness of the base alloy. Microstructural evolution was closely monitored and the mechanical properties have been related to the changes in microstructure. Three rapidly solidified inert gas atomised powder alloys were prepared, namely, Al–3·5Li, Al–3·5Li–0·3Zr, and Al–3·5Li–0·7Mn. These alloys were consolidated via cold compaction followed by hot extrusion. Microstructural development from the powder through consolidation to the final heat treated product was investigated using a combination of X-ray diffraction, differential scanning calorimetry, and transmission electron microscopy. Tensile properties and fracture toughness were evaluated in the as extruded and heat treated conditions. It was found that by careful selection of the solution treatment conditions a desirable distribution of cross-slip promoting hard particles could be achieved in both the transition element containing alloys. These dispersoids were identified as being the metastable ZrAl3 and stable MnAl6 phases. The addition of transition elements was found to enhance the yield strengths of the alloy with increases up to 20{\%} exhibited in the underaged condition. With respect to the fracture toughness of the materials, the Mn additions had the most pronounced effect, producing an improvement of almost 100{\%} in this property.",
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AB - The development of microstructure and properties during the consolidation and heat treatment of low density rapidly solidified Al–Li alloys is discussed in this paper. The effects of Zr and Mn as ternary additions to a binary Al–3·5Li base are investigated, the additions being made in an attempt to improve the strength and fracture toughness of the base alloy. Microstructural evolution was closely monitored and the mechanical properties have been related to the changes in microstructure. Three rapidly solidified inert gas atomised powder alloys were prepared, namely, Al–3·5Li, Al–3·5Li–0·3Zr, and Al–3·5Li–0·7Mn. These alloys were consolidated via cold compaction followed by hot extrusion. Microstructural development from the powder through consolidation to the final heat treated product was investigated using a combination of X-ray diffraction, differential scanning calorimetry, and transmission electron microscopy. Tensile properties and fracture toughness were evaluated in the as extruded and heat treated conditions. It was found that by careful selection of the solution treatment conditions a desirable distribution of cross-slip promoting hard particles could be achieved in both the transition element containing alloys. These dispersoids were identified as being the metastable ZrAl3 and stable MnAl6 phases. The addition of transition elements was found to enhance the yield strengths of the alloy with increases up to 20% exhibited in the underaged condition. With respect to the fracture toughness of the materials, the Mn additions had the most pronounced effect, producing an improvement of almost 100% in this property.

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