Strength and stability through variable micro segregation behaviour of Ta and Zr solutes at intermetallic interfaces in Al-Cu alloys
Source abstract
Abstract
A small amount of Zr and Ta are added to aluminium-copper (Al-Cu) alloys, and the evolution of strengthening phases with multi-step heat-treatment and their stability after prolonged thermal exposure at 250 °C has been studied. The L1 2 ordered (Al,Cu) 3(Zr,Ta) precipitates were formed in the Al-matrix, followed by preferential nucleation of Cu-rich θ"/θ` plates on the L1 2 /matrix interfaces. Transmission electron microscopy and atom probe tomography studies established the segregation of Zr and Ta at θ` plate/matrix in the aged alloys. It is shown that Zr segregates at coherent broad interfaces of θ` plate and inhibits the growth of these interfaces. Segregation of Ta primarily occurs at the growing θ` plate interface in the lengthening direction (semi-coherent interface) along with Zr and restricts the lengthening of the plate. The restricted growth triggers sympathetic nucleation of newer plates at the plate edges to sustain the growth process. A yield strength of ∼475 MPa at room temperature is recorded due to the presence of ordered precipitates and the growth restriction of θ` plate. Segregation of slow diffusing elements (Zr and Ta) also enhances the thermal stability of the microstructure.
Source: expertdata · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Aluminum Alloy Microstructure Properties · Aluminum Alloys Composites Properties · Microstructure and mechanical properties
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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