Thermal–Mechanical Working of Spark Plasma Sintered Preforms Fabricated from Aluminum 2219 Powder
| Autor: | Babak Shalchi Amirkhiz, M. Y. Amegadzie, Donald Paul Bishop, Bruce W. Williams, Ian W. Donaldson |
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| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Materials science Structural material Metallurgy 0211 other engineering and technologies Metals and Alloys Oxide Sintering Spark plasma sintering chemistry.chemical_element 02 engineering and technology Condensed Matter Physics 01 natural sciences Forging chemistry.chemical_compound chemistry Mechanics of Materials Aluminium 0103 physical sciences Ultimate tensile strength Elongation 021102 mining & metallurgy |
| Zdroj: | Metallurgical and Materials Transactions A. 51:4647-4661 |
| ISSN: | 1543-1940 1073-5623 |
| DOI: | 10.1007/s11661-020-05865-3 |
| Popis: | The effects of spark plasma sintering (SPS) coupled with hot upset forging of aluminum 2219 powder were studied. SPS was found to be an effective means of consolidating the powder as select specimens achieved full theoretical density. Although these as-sintered products also demonstrated a reasonable combination of tensile properties, they were greatly improved after forging. The most acute gains were observed in tensile ductility wherein three to four times improvements transpired. TEM analyses confirmed that forging manifested an appreciable disruption of the residual oxide networks present in the as-sintered product which was believed to be the primary driver of tensile property enhancements. SPS + forge products were also responsive to T87 heat treatment. Typical T87 values for tensile yield strength, UTS, and elongation to fracture were 350 MPa, 465 MPa, and 10 pct, respectively. Interestingly, these values were attainable over a wide range of sintering and forging temperatures. TEM analyses confirmed that θ′ was the dominant precipitate present in the SPS + forge-T87 products. |
| Databáze: | OpenAIRE |
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