Diffusion Behavior of Mn and Al in Refractory Elements Alloyed Tial-Based Intermetallic Compound with High-Throughput Diffusion Multiple Approach

Abstract

To investigate the impact of alloying elements on the diffusion behavior of Mn and Al in TiAl alloys, a series of diffusion couples were created using the high-throughput diffusion multiple experimental method. The couples consisted of Ti42Al5Mn-M (where M represents 0, 0.8W, 0.8Mo, 2Nb, and 2Zr, at. %), Ti42Al, and Ti54Al were subjected to aging at 1000 °C for 1000 hours. The phase composition of the treated samples, as well as the concentration changes of Al and Mn in the diffusion layers, were systematically analyzed using electron probe microanalysis (EPMA). Subsequently, the diffusion distances of Al and Mn were determined, and the diffusion coefficients of these elements in TiAl alloys containing W, Mo, Nb, and Zr were calculated in accordance with Fick's second law of diffusion. The effects of these alloying elements on the diffusion behavior of Mn and Al were thoroughly analyzed and discussed.

Keywords: TiAl intermetallic compound, high throughput, elemental diffusion, phase transformation, Fick's second law