IIT Gandhinagar research paves the way for Indigenous high-strength aluminium alloys for defence, aerospace, and strategic sector applications

When we think of aluminium, we realise its presence in everything from ordinary kitchen foil, beverage cans, and bicycles, to massive automobiles and aircraft components. Behind these products lies decades of sophisticated materials research that determines how strong, lightweight, durable, and corrosion-resistant aluminium (Al) can be. However, developing aluminium that is both lightweight and exceptionally strong has remained a longstanding challenge. Producing such advanced alloys has traditionally required years of trial-and-error experimentation, making innovation both time-consuming and expensive. The research at Indian Institute of Technology Gandhinagar (IITGN) is advancing this  domain through simulation-driven materials design that has the potential to accelerate the development of next-generation engineering materials, leading to stronger manufacturing ecosystems and strategic industries in India.   

This work is the foundation of a three-year research project funded by the Ministry of Mines, Government of India, that is being carried out by Prof Amit Arora in the Department of Materials Engineering. The research has earned international recognition, with Mr Sagar Kumar Deb, PhD scholar from IIGN, being granted the prestigious Larry Kaufman Scholarship 2026, a globally recognised award in the domain of computational thermodynamics. The scholarship is conferred by CALPHAD Inc. annually to only about 20 researchers worldwide, with Sagar being one among the very few Indian researchers and the first PhD scholar from IITGN to receive this honour. The award also enabled Sagar to present his research before leading scientists from around the world at the 53rd CALPHAD Conference, held in Quebec, Canada.

Many critical sectors in India, including defence, aerospace, transportation, and strategic infrastructure, rely on a commercial aluminium alloy (AA) from the 6xxx series known as AA6082. As one of the most widely used alloys, AA6082 is valued for its excellent combination of strength, corrosion resistance, and weldability. These features make it suitable for strategic applications such as radar telescopic masts, airport lighting systems, bomb disposal robots, heavy-duty tripods, structural frames, and various automotive and aerospace components. However, this AA6082 alloy, especially in the form of tubes, is heavily imported into India for our strategic sector applications. Although Indian aluminium industries are trying to substitute these imports with an indigenous alloy and products, a relatively lower strength of AA6082 alloy in the cold drawn tube format limits its application. At the same time, even the strength of the imported AA6082 is relatively low when compared to 2xxx and 6xxx series aluminium alloys.  Many researchers are trying to enhance the strength of 6xxx-series aluminium alloys, especially the AA6082, by adding copper and zinc. However, the addition of these elements reduces corrosion resistance, making components more susceptible to degradation over time. 

Sagar’s research involved the design of a new Aluminium-Magnesium-Silicon (Al-Mg-Si) based 6xxx series aluminium alloy that is free of copper and zinc. The designed alloy delivers higher strength than the AA6082 and any other Cu and Zn free 6xxx series alloys with good ductility while maintaining excellent corrosion resistance. This makes it an excellent indigenous alternative for our strategic sector applications without compromising long-term durability and eventually to reduce imports.

One of the most significant aspects of this research is not just the alloy itself, but how it was developed. Conventionally, developing a new alloy involves preparing hundreds of metal compositions in laboratories, testing each one individually, and gradually refining the composition—a process that may take several years. Instead, Sagar first designed the alloy virtually using advanced computer simulations followed by experimental validation.

This research is based on CALPHAD (CALculation of PHAse Diagrams), an advanced computational methodology that predicts how different metallic elements interact during melting, solidification, heating, and cooling and form different phases. In simple terms, CALPHAD functions like a virtual laboratory, allowing researchers to evaluate thousands of possible alloy compositions digitally before manufacturing the most promising candidates.

Once the computational design was finalised, the alloy was experimentally manufactured and characterised using advanced analytical techniques, including X-ray diffraction (XRD) and electron microscopy, to verify that its microstructure and mechanical properties matched the simulation predictions.

This simulation-driven approach significantly reduces research time, lowers development costs, minimises material wastage, and enables researchers to design alloys with far greater precision than conventional trial-and-error methods.

The project has now reached Technology Readiness Level (TRL) 4, indicating that the alloy prototype has been successfully validated under laboratory conditions and is now progressing towards industrial-scale validation.

To facilitate this transition, the research is being carried out in collaboration with the Jawaharlal Nehru Aluminium Research Development and Design Centre (JNARDDC), Nagpur, and Siddhi Engineers, Ahmedabad, where the alloy has been successfully processed for further validation. The next phase of the project will focus on industrial-scale testing for cold-drawn tubes, followed by technology transfer to the Indian aluminium industry and eventual commercialisation. A provisional Indian patent (Application No. 202621017676) has also been filed for the technology, with the complete patent specification scheduled for submission shortly. 

Commenting on the significance of the research, Prof Arora, Associate Professor, Department of Materials Engineering at IITGN, said, "Developing indigenous high-performance aluminium alloys is an important step towards strengthening India's manufacturing ecosystem and reducing reliance on imports for strategic applications. Sagar's work demonstrates how computational materials engineering can accelerate materials discovery while addressing real industrial challenges. It exemplifies the kind of translational research we strive to promote at IIT Gandhinagar—research that combines scientific excellence with tangible industrial and national impact."

Beyond its scientific contribution, the research addresses an important national requirement. If successfully commercialised, the newly developed alloy could enable Indian manufacturers to produce advanced aluminium components domestically, reducing dependence on imported strategic materials and products while strengthening India's manufacturing ecosystem. The technology directly supports national initiatives such as Make in India and Atmanirbhar Bharat by promoting the indigenous development of advanced engineering materials that are currently sourced internationally.

Because the alloy combines higher strength, lower weight, excellent corrosion resistance, and compatibility with existing industrial manufacturing infrastructure, lighter structural components developed from it can also improve fuel efficiency, reduce material consumption, lower manufacturing costs, and contribute to reduced carbon emissions across multiple industries.

The research exemplifies how fundamental scientific research can be translated into practical engineering solutions with real industrial impact. When asked about the next step related to this research, Sagar said, “The immediate goal is to complete industrial-scale validation of the alloy for cold-drawn tubes, secure the complete patent, and transfer the technology to the Indian aluminium industry”. Beyond the scholarship, Sagar’s academic journey includes several notable achievements, including the Outstanding Graduate Teaching Fellow Award (2025) at IITGN, the University Gold Medal during his MTech at Tripura University, travel grants from IITGN for international conferences and research visits, and the filing of a patent arising from his doctoral research.

For Sagar, who comes from Tripura, a state in the Northeastern part of India, the recognition carries a special significance. “I hope my journey inspires more students from Northeast India and other underrepresented regions of our country to pursue advanced scientific research despite resource and financial constraints,” he added.