An as-solution treated Mg-6Gd-1Y-0.4Zr alloy was processed by low temperature thermo-mechanical treatments （LT-TMT）, including cold tension with various strains followed by aging at 200 °C to peak hardness. The...An as-solution treated Mg-6Gd-1Y-0.4Zr alloy was processed by low temperature thermo-mechanical treatments （LT-TMT）, including cold tension with various strains followed by aging at 200 °C to peak hardness. The results show that the precipitation kinetics of the alloy experienced LT-TMT is greatly accelerated and the aging time to peak hardness is greatly decreased with increasing tensile strain. The tensile yield strength, ultimate tensile strength and elongation at room temperature of the alloy after cold tension with strain of 10% and peak aging at 200 °C are 251 MPa, 296 MPa and 8%, respectively, which are superior to the commercial heat-resistant WE54 alloy, although the latter has a higher rare earth element content.展开更多
The hot-compression of Al-IMn-IMg （mass fraction, %） alloy sample was carried out on a Gleeble-1500 thermo-simulator at deformation temperatures from 320 to 400 ℃ and strain rates from 0.1 to 10 s 1 by total strain...The hot-compression of Al-IMn-IMg （mass fraction, %） alloy sample was carried out on a Gleeble-1500 thermo-simulator at deformation temperatures from 320 to 400 ℃ and strain rates from 0.1 to 10 s 1 by total strain of 1.4. Microstructure and texture evolution of the hot-compressed alloy were investigated by optical microscopy and X-ray diffraction analysis, respectively. The results show that the relationship among flow stress a, deformation temperature T and strain rate ε can be expressed in the form of βσ = lnε＋Q/（RT）-lnA. The threshold value of In Z （Z is Zener-Hollomon parameter） characterizing the dynamic recrystallization （DRX） is 46, below which the DRX takes place. A strong P orientation {011}（455） associated with a weak cube orientation { 100} （001） is found in the recrystallized sample during hot-compression.展开更多
基金Projects(50971089,51171113,51001072)supported by the National Natural Science Foundation of ChinaProjects(2012M511089,20090460615,201003267)supported by the Postdoctoral Science Foundation of China
文摘An as-solution treated Mg-6Gd-1Y-0.4Zr alloy was processed by low temperature thermo-mechanical treatments （LT-TMT）, including cold tension with various strains followed by aging at 200 °C to peak hardness. The results show that the precipitation kinetics of the alloy experienced LT-TMT is greatly accelerated and the aging time to peak hardness is greatly decreased with increasing tensile strain. The tensile yield strength, ultimate tensile strength and elongation at room temperature of the alloy after cold tension with strain of 10% and peak aging at 200 °C are 251 MPa, 296 MPa and 8%, respectively, which are superior to the commercial heat-resistant WE54 alloy, although the latter has a higher rare earth element content.
基金Project(2007BAE38B01) supported by National Science and Technology Pillar Program
文摘The hot-compression of Al-IMn-IMg （mass fraction, %） alloy sample was carried out on a Gleeble-1500 thermo-simulator at deformation temperatures from 320 to 400 ℃ and strain rates from 0.1 to 10 s 1 by total strain of 1.4. Microstructure and texture evolution of the hot-compressed alloy were investigated by optical microscopy and X-ray diffraction analysis, respectively. The results show that the relationship among flow stress a, deformation temperature T and strain rate ε can be expressed in the form of βσ = lnε＋Q/（RT）-lnA. The threshold value of In Z （Z is Zener-Hollomon parameter） characterizing the dynamic recrystallization （DRX） is 46, below which the DRX takes place. A strong P orientation {011}（455） associated with a weak cube orientation { 100} （001） is found in the recrystallized sample during hot-compression.
