Preparation of Fe–As alloys by mechanical alloying and vacuum hot‐pressed sintering: microstructure evolution, mechanical properties, and mechanisms
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Bibliographic record
Abstract
Abstract Arsenic materials have attracted great attention due to their unique properties. However, research concerning iron–arsenic (Fe–As) alloys is very scarce due to the volatility of As at low temperature and the high melting point of Fe. Herein, a new Fe–As alloy was obtained by mechanical alloying (MA) followed by vacuum hot‐pressed sintering (VHPS). Moreover, a systematic study was carried out on the microstructural evolution, phase composition, leaching toxicity of As, and physical and mechanical properties of Fe–As alloys with varying weight fractions of As (20%, 25%, 30%, 35%, 45%, 55%, 65%, and 75%). The results showed that pre‐alloyed metallic powders (PAMPs) have a fine grain size and specific super‐saturated solid solution after MA, which could effectively improve the mechanical properties of Fe–As alloys by VHPS. A high density (> 7.350 g·cm −3 ), low toxicity, and excellent mechanical properties could be obtained for Fe–As alloys sintered via VHPS by adding an appropriate amount of As, which is more valuable than commercial Fe–As products. The Fe‐25% As alloy with low toxicity and a relatively high density (7.635 g·cm −3 ) provides an ultra‐high compressive strength (1989.19 MPa), while the Fe‐65% As alloy owns the maximum Vickers hardness (HV 0.5 899.41). After leaching by the toxicity characteristic leaching procedure (TCLP), these alloys could still maintain good mechanical performance, and the strengthening mechanisms of Fe–As alloys before and after leaching were clarified. Changes in the grain size, microstructure, and phase distribution induced significant differences in the compressive strength and hardness.
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it