Achieving ballistic impact resistance in a lightweight magnesium(Mg)alloy is a requirement of the aerospace and military industries.However,Mg alloy has poor ballistic impact resistance,mainly attributed to its soft n...Achieving ballistic impact resistance in a lightweight magnesium(Mg)alloy is a requirement of the aerospace and military industries.However,Mg alloy has poor ballistic impact resistance,mainly attributed to its soft nature and hexagonal close-packed(HCP)crystal structure.In the current study,we reported that the die-casted Mg-Gd-Y-Zn(WEZ)alloy displayed high ballistic impact resistance against a 7.62 mm steel core projectile under both low and high-velocity impact.Most specifically,a perfect ballistic impact resistance is achieved at velocities of 344 and 605 m s^(-1),having a depth of penetration of~12 and~25 mm,respectively.In addition,for a very high velocity of 810 m s^(-1),the projectile was impeded in the sheet but at the cost of a small hole/scab on the rear face.The potential reason is the“fibrous microstructure”,comprised of profuse blocky type long period stacking order(LPSOs),rod type LPSOs,lamellar LPSOs,and some rare earth(RE)enriched precipitates.These“microstructure features”act like a fiber reinforced α-Mg and play a decisive role in achieving high strength at super elevated temperature compression(500℃)under a high strain rate(~4000 s^(-1)),even much higher compared to 4000 s^(-1) at room temperature.As a result,this characteristic of WEZ Mg alloy leads to a high absorption ca-pacity at elevated temperatures(90.83~MJ m^(-3)).This high absorption capacity due to high strength at elevated temperatures,fibrous microstructure,and hardness(~80 HV)offered high resistance to impact and shock wave propagation.Consequently,the projectile experienced a high resistance against perforation,and therefore,ballistic impact resistance was achieved.Last but not least,the post-deformation features also help in understanding the stress mitigation of WEZ Mg alloy during ballistic impact,which can be advantageous while designing Mg alloys as a ballistic impact-resistant material.展开更多
基金fully supported by the“National Natural Science Foundation of China(Nos.W2433126(RFIS-I),52274401,and 52250410344(RFIS-I))”.
文摘Achieving ballistic impact resistance in a lightweight magnesium(Mg)alloy is a requirement of the aerospace and military industries.However,Mg alloy has poor ballistic impact resistance,mainly attributed to its soft nature and hexagonal close-packed(HCP)crystal structure.In the current study,we reported that the die-casted Mg-Gd-Y-Zn(WEZ)alloy displayed high ballistic impact resistance against a 7.62 mm steel core projectile under both low and high-velocity impact.Most specifically,a perfect ballistic impact resistance is achieved at velocities of 344 and 605 m s^(-1),having a depth of penetration of~12 and~25 mm,respectively.In addition,for a very high velocity of 810 m s^(-1),the projectile was impeded in the sheet but at the cost of a small hole/scab on the rear face.The potential reason is the“fibrous microstructure”,comprised of profuse blocky type long period stacking order(LPSOs),rod type LPSOs,lamellar LPSOs,and some rare earth(RE)enriched precipitates.These“microstructure features”act like a fiber reinforced α-Mg and play a decisive role in achieving high strength at super elevated temperature compression(500℃)under a high strain rate(~4000 s^(-1)),even much higher compared to 4000 s^(-1) at room temperature.As a result,this characteristic of WEZ Mg alloy leads to a high absorption ca-pacity at elevated temperatures(90.83~MJ m^(-3)).This high absorption capacity due to high strength at elevated temperatures,fibrous microstructure,and hardness(~80 HV)offered high resistance to impact and shock wave propagation.Consequently,the projectile experienced a high resistance against perforation,and therefore,ballistic impact resistance was achieved.Last but not least,the post-deformation features also help in understanding the stress mitigation of WEZ Mg alloy during ballistic impact,which can be advantageous while designing Mg alloys as a ballistic impact-resistant material.
