“…The distribution of the α precipitates, which were embedded in the β grains and the ternary MgLiAl 2 phase, was homogenized by ECAP processing. The existence of the MgLiAl 2 phase was confirmed using various diffraction methods [14], which disagrees with other findings, in which the MgLi 2 Al phase was observed [10,13].…”
MICROSTRUCTURE AND TEXTURE CHANGES OF MgLiAl ALLOYS COMPOSED OF α OR α + β PHASES AFTER TWIST CHANNEL ANGULAR PRESSING TCAPTwo MgLiAl alloys of composition 4.5% Li and 1.5% Al (in wt.%) composed of α phase and of 9% Li, 1.5% Al composed of α (hcp) + β (bcc) phases were subjected to twist channel angular pressing (TCAP) deformation. Such deformation of α + β alloys caused less effective grain refinement than that of single α phase alloy. However, with increasing number of passes, grain size of single α phase alloy increased and that of β phase in two phase α + β alloy also grew, which suggested the effect of dynamic recrystallization. TEM studies allowed identifying particles of Li 2 MgAl phase of size of few μm. {001}<100> texture was observed in extruded alloy. Texture studies of extruded and TCAPed single phase hcp alloy indicated texture with {101 -0} plane perpendicular to the extrusion direction and {0002} plane parallel to the extrusion direction. Duplex α + β alloys showed poor texture development.
“…The distribution of the α precipitates, which were embedded in the β grains and the ternary MgLiAl 2 phase, was homogenized by ECAP processing. The existence of the MgLiAl 2 phase was confirmed using various diffraction methods [14], which disagrees with other findings, in which the MgLi 2 Al phase was observed [10,13].…”
MICROSTRUCTURE AND TEXTURE CHANGES OF MgLiAl ALLOYS COMPOSED OF α OR α + β PHASES AFTER TWIST CHANNEL ANGULAR PRESSING TCAPTwo MgLiAl alloys of composition 4.5% Li and 1.5% Al (in wt.%) composed of α phase and of 9% Li, 1.5% Al composed of α (hcp) + β (bcc) phases were subjected to twist channel angular pressing (TCAP) deformation. Such deformation of α + β alloys caused less effective grain refinement than that of single α phase alloy. However, with increasing number of passes, grain size of single α phase alloy increased and that of β phase in two phase α + β alloy also grew, which suggested the effect of dynamic recrystallization. TEM studies allowed identifying particles of Li 2 MgAl phase of size of few μm. {001}<100> texture was observed in extruded alloy. Texture studies of extruded and TCAPed single phase hcp alloy indicated texture with {101 -0} plane perpendicular to the extrusion direction and {0002} plane parallel to the extrusion direction. Duplex α + β alloys showed poor texture development.
“…The compilation of tensile YSs and elongations of Mg-Li-based alloys from Refs. [24,46,[247][248][249][250][251][252][253][254] is shown in Figure 35.…”
Section: Mg-li-based Alloysmentioning
confidence: 99%
“…The compilation of tensile YSs and elongations of Mg–Li-based alloys from Refs. [24,46,247–254] is shown in Figure 35.Figure 35.Tensile yield strengths and elongations of Mg–Li-based alloys [24,46,247–254]. …”
Magnesium (Mg) alloys have received a significant interest in the past 20 years, owing to a nonlinearly increasing demand for lightweight structural materials. Magnesium extrusions alloys to date have had lower industrial uptake than their counterpart aluminium extrusion alloys, predominantly due to lower extrudability and formability, tension-compression yield asymmetry and no clear advantage in the specific strength. Any improvement in extrusion alloy properties requires a better understanding of the effects of alloy composition and processing conditions; and how these dictate the final alloy microstructure. This review sheds insightful information on the processing-microstructure-property relationships of extruded magnesium alloys. Historical and recent progress in magnesium extrusion alloys is critically reviewed, including the advances in extrudability, mechanical properties and microstructural characterisation. The challenges associated with the 'gap' in properties between the magnesium and aluminium extrusion alloys are identified, and prospects discussed regarding the development of high performance magnesium extrusion alloys.
“…Normally, the mechanical behavior and corrosion resistance of the MgLi alloy can be improved by alloying, 4) post-processing (i.e. hot rolling, extrusion, and heat treatment), 5,6) and surface coating. 7) Simultaneously increase strength and corrosion resistance by alloying, but it is easy to cause elemental pollution and waste.…”
The effects of ultrasonic nanocrystal surface modification (UNSM) treatments on the microstructure, mechanical, and corrosion behavior of LZ91 MagnesiumLithium (MgLi) alloy were systematically investigated. The results show that UNSM treatments have greatly positive effects on the mechanical and corrosion behavior improvements. As compared to the bare sample (BS), the near-surface grains were refined and the surface roughness (R a ) of the sample was reduced from 0.514 µm to 0.082 µm; and the maximum hardness and tensile yield strength remarkable increased by 70% and 65.4% after UNSM treatments, respectively. In addition, the corrosion behavior of LZ91 MgLi alloy was also improved after UNSM treatments. The mechanical and corrosion behavior improvements can be attributed to the introduced thick hardening layer with low roughness and smaller grains by UNSM treatments.
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