Speakers

​​​​​High‑temperature alloys used at elevated application temperatures are subject to a slow, time‑dependent deformation known as creep. Understanding this creep behaviour is essential for estimating the operational lifetime of these materials. Traditionally, uniaxial creep tests are used at high temperatures to determine the creep rates that define the deformation. More recently, bending creep experiments on cantilever specimens, combined with digital image correlation (DIC), have emerged as a promising high‑throughput approach for rapidly estimating creep life.

In this work, we compare the uniaxial creep response of directionally solidified Al10Co25Cr8Fe15Ni36Ti6 compositionally complex alloy with its bending creep behaviour at 750 °C using high‑temperature DIC. The bending creep rates are compared with those of uniaxial data across stresses from 300 to 450 MPa. The measured creep exponent is an indicator on how the two methods correlate.

To enable these measurements, we developed an in‑house setup capable of performing high‑temperature bending creep tests with DIC‑based strain measurement. Our findings show that bending creep, when combined with DIC, is a practical and efficient technique for evaluating the creep behaviour of high‑temperature alloys. It requires substantially less time and material than conventional uniaxial creep testing, offering savings in cost, energy, and experimental effort. We anticipate that this method will be particularly valuable for screening newly developed high‑temperature materials. For example, during rapid alloy discovery efforts, creep life could be assessed much more quickly and with minimal material consumption. The approach may also be extended to high‑entropy alloys and additively manufactured alloys designed for high‑temperature applications.​