Microstructural evaluation and mechanical properties of bulk nanostructured Al86Cu6Y6La2 (at.%) alloy produced by hot consolidation of amorphous melt-spun flakes
Source abstract
Abstract
Amorphous melt- spun Al 86Cu 6Y 6La 2 (at.%) alloy is hot consolidated at T = 723 K and P = 700 MPa. The glassy ribbons show three devitrification steps which fcc-Al phase is precipitated during the first crystallization stage, and formation of intermetallic compounds (Al 3Y, AlCu, AlCu 3 and Al 3Y 5) take place in the next steps. The calculated Avrami exponent (n ∼ 2.6) shows the first crystallization reaction is governed by the diffusional growth process and increasing nucleation rate. Moreover, the activation energy calculated with different methods show that Ea for the primary crystallization are in the range of about 254- 267 KJ.mol −1. Amorphous ribbons exhibit a remarkably tensile strength of 910 ± 7 MPa. Combined rapid solidification and hot consolidation produce a bulk sample with high hardness (345.1 ± 12.3 HV), compressive strength (460 ± 10 MPa) and 4 pct plastic strain. These high mechanical properties are due to ultrafine microstructure induced by the rapid solidification process.
Source: expertdata · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Metallic Glasses and Amorphous Alloys · Aluminum Alloys Composites Properties · Nonlinear Optical Materials Studies
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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