IIT Jodhpur reports a lighter niobium alloy with improved laboratory oxidation resistance at 1,000°C

Rocket nozzles, hypersonic vehicle leading edges and turbine hot sections all need metals that stay strong in extreme heat. Most metals that survive those temperatures are heavy, expensive or oxidise quickly in air. A team at the Indian Institute of Technology Jodhpur says it has made progress on all three problems with a new niobium-based alloy, which the institute presented on 10 November 2026.

The group is led by Dr Saurabh Nene, an associate professor in IIT Jodhpur's Department of Metallurgical and Materials Engineering. It describes the material as a niobium-based Refractory Complex Lean Alloy (RCLA). According to coverage of the institute's announcement, the work has been published in the journal Materials & Design.

The numbers

As reported in coverage of the announcement, which was based on a PIB-sourced summary:

• Oxidation: After 24 hours of continuous exposure to air at 1,000°C, the alloy gained only 43.48 mg/cm² in weight from oxidation. Mass gain can help compare oxidation under matched conditions, alongside checks for scale loss and other damage.
• Strength: It has a room-temperature yield strength of 1.13 GPa, and it withstood about 29% compressive strain before failure, which points to useful ductility as well as strength.
• Density: The reported density is about 7.6 g/cm³. The announcement compared this with commercial niobium alloys such as C-103 and WC-3009, which it described as weighing around 9–10 g/cm³. The density advantage depends on the reference alloy and its composition. It is still significant for flight hardware.

DeepTech India has not reviewed the full journal paper. The figures above are as reported in news coverage of the institute's release.

Why niobium, and why "lean"

Niobium is a refractory metal: it melts at about 2,477°C and keeps its strength at temperatures where nickel superalloys begin to soften. That is why niobium alloys such as C-103 have been used for decades in rocket thruster nozzles and nozzle extensions, including on spacecraft engines. Their weakness is oxidation. Unprotected niobium reacts quickly with oxygen at high temperature, so components usually need silicide coatings, and if the coating cracks the part can fail fast.

The past two decades of alloy research have produced "high-entropy" and "complex concentrated" alloys that mix four or five principal elements in roughly equal amounts. Some of these show remarkable high-temperature properties, but they often rely on costly or heavy elements such as tantalum, tungsten and hafnium, and they can be brittle.

A lean alloy strategy goes the other way. It uses fewer alloying additions, in smaller amounts, chosen so they encourage protective oxide layers and lighter phases while keeping niobium as the base. The aim is a material that is cheaper to make, lighter and more oxidation-resistant than a classic refractory alloy, without the cost and brittleness of a full high-entropy composition.

Where it could matter

High-temperature structural materials are a strategic bottleneck for India. They are needed for:

• Space propulsion: nozzle extensions and thruster chambers on upper stages and satellite propulsion systems, where every gram saved adds payload.
• Hypersonics and missiles: leading edges, control surfaces and combustor liners for vehicles such as scramjet demonstrators, which face sustained aerodynamic heating.
• Aero-engines: turbine and exhaust components, an area where India's push for an indigenous fighter-engine programme depends on mastering hot-section materials.

Much of this material science is controlled by a few countries, and specialised refractory alloys and their processing know-how are often export-restricted. A domestically designed alloy with a published property set gives Indian agencies and industry a starting point that does not depend on licensed foreign compositions.

The caveats

A promising coupon test in a laboratory is far from a flight-qualified material. Before engineers could specify the alloy for real hardware, it would need data on creep at temperature, fatigue, behaviour under thermal cycling, weldability and formability, performance with and without protective coatings, and reproducible production at scale, typically by vacuum arc melting followed by forging or additive manufacturing. Oxidation tests over 24 hours are a useful screen, but components may need to survive hundreds of hours or many cycles.

The next steps to watch are collaborations with ISRO, DRDO laboratories such as the Defence Metallurgical Research Laboratory, or Mishra Dhatu Nigam (MIDHANI), the public-sector producer of special alloys, which could take the composition from the lab towards qualified mill products.

Why it matters

India's deep-tech ambitions in launch vehicles, hypersonics and jet engines all run into the same limit: materials that can take the heat. Work like IIT Jodhpur's lean-alloy programme is the slow, foundational science that determines whether those systems are designed around imported metals or Indian ones. One alloy will not close the gap, but it shows academic groups now publishing competitive results in a field long dominated by a few national laboratories abroad.

Sources

• ETV Bharat: https://www.etvbharat.com/en/bharat/iit-jodhpur-indigenously-developed-alloy-could-revolutionise-india-defence-aviation-space-sectors-enn26111005558
• Indian Defence News: https://www.indiandefensenews.in/2026/11/iit-jodhpurs-indigenous-high.html
• Current Affairs summary of the PIB release (10 November 2026): https://cracktarget.com/current-affairs-10-november-2026/
• IIT Jodhpur Advanced Materials Design and Processing Group: https://sites.google.com/view/amdpiitj/home
• Materials Horizons (earlier TiAl complex alloy work): https://pubs.rsc.org/en/Content/ArticleLanding/2026/MH/D5MH01514F
• C-103 technical data (Golden Sunbird Metals): https://gsalloy.com/niobium-c-103-alloy-uns-r04295-nb-10hf-1ti-a-technical-guide/