Microstructure Evolution of Ni3Al-Based Intermetallic Alloy Strips After Hot Rolling

TL;DR

This paper studies how hot rolling temperature and strain rate affect the microstructure of a Ni3Al-based alloy containing Zr and B.

Contribution

The study identifies the initiation of dynamic recrystallization in Ni3Al alloy at 1100 °C and evaluates its dependence on temperature and strain rate.

Findings

Dynamic recrystallization begins at 1100 °C during hot rolling of the Ni3Al alloy.

The fraction of dynamically recrystallized grains increases with higher temperature and strain rate.

A non-stationary heat transfer model was used to estimate heat losses during hot rolling.

Abstract

The effect of the temperature and strain rate during the hot rolling process on the microstructural evolution in fine-grained Ni3Al intermetallic alloy doped with Zr and B was examined in this work. The hot rolling process was carried out at an initial temperature range of 1000, 1100, and 1280 °C and at a strain rate between 3.9 × 10−1 s−1 and 2.5 s−1. The results of the EBSD microstructural analyses revealed that dynamic recrystallization phenomena are initiated at the rolling temperature of 1100 °C, while a fraction of the dynamically recrystallized grains further increases with both the rising temperature and strain rate of the deformation process. Furthermore, to estimate the heat losses during the hot rolling processing, a non-stationary heat transfer model was formulated and then used to evaluate the experimentally received data.

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