Microstructural evolution and intermetallic formation in Zn-3Mg (wt%) powder mixture processed by high-pressure torsion

被引:4
|
作者
Rahman, Tanzilur [1 ]
Yilmazer, Hakan [2 ,3 ]
Dikici, Burak [4 ]
Edalati, Kaveh [5 ]
Poplawsky, Jonathan D. [6 ]
Boehlert, Carl J. [1 ]
机构
[1] Michigan State Univ, Dept Chem Engn & Mat Sci, E Lansing, MI 48824 USA
[2] Yildiz Tech Univ, Dept Met & Mat Engn, Istanbul, Turkiye
[3] Hlth Biotechnol Joint Res & Applicat Ctr Excellenc, Istanbul, Turkiye
[4] Ataturk Univ, Fac Engn, Dept Met & Mat Engn, Erzurum, Turkiye
[5] Kyushu Univ, Int Inst Carbon Neutral Energy Res WPI I2CNER, WPI, Fukuoka, Japan
[6] Oak Ridge Natl Lab, Ctr Nanophase Mat Sci, Oak Ridge, TN USA
基金
美国国家科学基金会;
关键词
High-pressure torsion; Zinc; Magnesium; Zn -Mg intermetallics; Ultrafine-grained biomaterial; SEVERE PLASTIC-DEFORMATION; PURE METALS; GRAIN-SIZE; DYNAMIC RECRYSTALLIZATION; PHASE-TRANSITIONS; CU; CONSOLIDATION; BEHAVIOR; ALLOYS; COLD;
D O I
10.1016/j.jallcom.2023.172101
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Severe plastic deformation (SPD) techniques have been used extensively over the past 40 years for producing strong metals and alloys. High-pressure torsion (HPT) is one of the most promising SPD techniques for achieving high strength through nanoscale grain refinement and phase transformation. In this research, a mixture of pure zinc (Zn) and magnesium (Mg) powders, Zn-3Mg (wt%), was HPT-processed under a pressure of 6 GPa for 1, 5, 10, 20, and 30 turns at room temperature to achieve a high strength biodegradable material. In order to un-derstand the effects of pre-consolidation on the resulting microstructure and hardness, HPT processing was performed on loose powders placed in the die and also on a pre-compacted powder mixture and the resulting HPT disks were characterized by X-ray diffraction, scanning electron microscopy, atom probe tomography, and Vickers microhardness. In both cases, the HPT disk microstructures contained nanoscale grains, and stable and metastable strain-induced intermetallics, but an unusual softening appeared at large shear strains. Grain size, grain morphology, and the formation of different intermetallics were analyzed to explain the unusual hardness distribution, and it was found that an inverse Hall-Petch relationship between hardness and grain size exists. It is suggested that thermally-activated phenomena such as grain boundary sliding contributed to the strain-induced softening of this nano-structured biomaterial due to its low melting point. The current results are compared with those for HPT-processed cast alloys and hybrids of the same composition.
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页数:13
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