Bulk nanostructured Al-4Cu alloy was synthesized by high energy ball milling followed by vacuum hot pressing. Its thermal stability was investigated up to 450°C using differential scanning calorimetry, X-ray diffraction, and transmission electron microscopy. The results showed that grain growth in this Al-4Cu alloy was very limited and grain sizes in the range of 100 nm were still present in the alloys after exposure to 450 °C corresponding to a temperature as high as 0.77 T/Tm. The TEM investigations reveal that such a high thermal stability against grain growth observed in this alloy is attributed to the presence of ultrafine dispersoids. © (2011) Trans Tech Publications.

V. Subramanya Sarma

Department of Metallurgical and Materials Engineering

Budaraju Srinivasa Murty

AL-CU ALLOYS

grain size

High thermal stability

HIGH-ENERGY BALL MILLING

Nano-structured

Ultrafine

Vacuum hot pressing

Alloys

Aluminum

Ball milling

Cerium alloys

Crystalline materials

Differential scanning calorimetry

Grain growth

Grain size and shape

High energy physics

Hot pressing

Milling (machining)

MILLING MACHINES

Thermodynamic stability

Transmission electron microscopy

vacuum

Vanadium

X ray diffraction

Copper alloys

IIT Madras is a public technical and research university located in Chennai, Tamil Nadu. Founded in 1959, it is recognised as an Institute of National Importance.

IIT Madras has been ranked as the top engineering institute in India for four years in a row by the National Institutional Ranking Framework of the MHRD

It currently offers undergraduate, postgraduate and research degrees across 16 disciplines in Engineering, Sciences, Humanities and Management. About 596 faculty belonging to science and engineering departments and centres of the Institute are engaged in teaching, research and industrial consultancy.

IIT Madras

Materials Science Forum

In the present work influence of annealing on precipitation phenomena, thermal stability and grain growth kinetics of a bulk ultrafine grained (UFG) Al 2014 alloy has been studied. As-received solution treated Al 2014 alloy is subjected to cryorolling (CR) to develop ultrafine grained microstructure and subsequently, annealing treatment in the range of 323 K (50 °C) to 673 K (400 °C) for the duration of 30 min is done to study its thermal stability. The recrystallization process of the cryorolled Al 2014 alloy starts at 373 K (100 °C) and completes at 523 K (250 °C). The UFG microstructure is retained in the CR Al 2014 alloy up to 623 K (350 °C). The high thermal stability of the UFG grained Al 2014 alloy is due to pinning action of precipitate particles of Cu2Al and AlCuMgSi phases which are within the range of 100 nm and lying along the grain boundaries. The activation energy required for grain growth of the CR Al 2014 alloy is found to be exceptionally high as compared to other processing routes. © 2015 Elsevier B.V. All rights reserved.

Journal of Alloys and Compounds

Precipitation phenomena, thermal stability and grain growth kinetics in an ultra-fine grained Al 2014 alloy after annealing treatment

Thermal stability of vacuum hot pressed bulk nanostructured Al-Cu alloys

Bulk nanostructured Al-4 wt pct Cu alloy with high compression strength (879 MPa) was produced by mechanical alloying followed by vacuum hot pressing (VHP). The hot-pressed compacts were nanostructured with a grain size of 50 nm and were densified to more than 99 pct of the theoretical density. Contributions from different strengthening mechanisms were estimated using simplified models and were compared with the experiment. © 2009 The Minerals, Metals & Materials Society and ASM International.

Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science

Microstructure and mechanical properties of nanostructured Al-4Cu alloy produced by mechanical alloying and vacuum hot pressing

Metallurgical and Materials Transactions A

Mechanical behavior and microstructure of a thermally stable bulk nanostructured Al alloy

Scripta Materialia

Grain growth kinetics of a mechanically milled nanocrystalline Al

Encyclopedia of Materials: Science and Technology

Spray Casting: Applications

Journal	Materials Science Forum
Publisher	Trans Tech Publications Ltd
ISSN	02555476
Open Access	No