The 500℃ isothermal section of the phase diagram of the Cu Be Ag (Cu≥50 at%) ternary system was investigated by X ray powder diffraction. The isothermal section consists of two single phase regions (namely α C...The 500℃ isothermal section of the phase diagram of the Cu Be Ag (Cu≥50 at%) ternary system was investigated by X ray powder diffraction. The isothermal section consists of two single phase regions (namely α Cu and CuBe), two two phase regions (namely α Cu+Ag and CuBe+α Cu) and one three phase region (namely α Cu+Ag+CuBe). The maximum solubility of Be in α Cu and Ag in α Cu are about 6.6 at% and 0.8 at% respectively.展开更多
The influence of aging treatment on the microstructure,mechanical properties and electrical conductivity of Cu-0.5 wt pct Be alloy for connector material applications was investigated.The properties of mechanical stre...The influence of aging treatment on the microstructure,mechanical properties and electrical conductivity of Cu-0.5 wt pct Be alloy for connector material applications was investigated.The properties of mechanical strength and electrical conductivity increase with increasing aging temperature and time.Microstructure of the aged Cu-Be alloy revealed that grain size and fraction of low angle and high angle grain boundary were not greatly changed;however,transmission electron microscopy （TEM） analysis exhibited that beryllides precipitation （CoBe and NiBe） with a size of 50 nm were distributed in grains.It was,therefore concluded that these beryllide precipitates improved the mechanical strength and also it was favor in improvement of electrical conductivity.展开更多
利用X射线衍射(XRD)及差热分析(DSC)等方法研究了添加B对Zr Ti Cu Ni Be块状非晶合金的形成、结晶及热稳定性的影响·结果表明:在Zr Ti Cu Ni Be合金系中添加B可明显改变该合金的玻璃转变温度Tg,一次结晶温度Tx及过冷液相区ΔT等参...利用X射线衍射(XRD)及差热分析(DSC)等方法研究了添加B对Zr Ti Cu Ni Be块状非晶合金的形成、结晶及热稳定性的影响·结果表明:在Zr Ti Cu Ni Be合金系中添加B可明显改变该合金的玻璃转变温度Tg,一次结晶温度Tx及过冷液相区ΔT等参数·当y(B)≤3%时,B的添加可使合金保持块状非晶,提高Tg、Tx并扩大过冷液相区,使非晶热稳定性增加;当y(B)≥6%时,B的添加将诱导大量的粗大Zr2Cu及ZrB2等晶体的析出·由于它们非纳米晶,尺寸较大,形状不规整,不能作为非晶复合材料的增强体·展开更多
In this paper,the evolutions of microstructure and mechanical properties of Cu-l.9Be-0.3Ni-0.15Co alloy were studied.The alloys in the condition of the solution treated（soft state） and 37% cold rolled（hard state） ...In this paper,the evolutions of microstructure and mechanical properties of Cu-l.9Be-0.3Ni-0.15Co alloy were studied.The alloys in the condition of the solution treated（soft state） and 37% cold rolled（hard state） were aged at 320 ℃for different time,respectively.The mechanical properties,electrical conductivity and microstructure of the alloy aged for different time were analyzed.Additionally,the precipitation kinetics of Cu-1.9Be-0.3Ni-0.15Co alloys was investigated.X-ray diffraction and transmission electron microscopy results reveal that both continuous precipitation and discontinuous precipitation existed in the hard-state Cu-l.9Be-0.3Ni-0.15Co alloy during the whole aging process;the sequence of continuous precipitation is G.P.zone →γ″→γ′→γ.Furthermore,the precipitation transformation mechanism of softstate alloy is homogeneous nucleation,while hard-state alloy shows the heterogeneous nucleation（interface nucleation）with the nucleation rate of both states decaying rapidly to zero during aging at 320 ℃.展开更多
The effects of Ni content(0−2.10 wt.%)on the precipitated phase,strength and electrical conductivity of Cu−0.4wt.%Be alloy were investigated,and the influencing mechanism was analyzed.The results showed that the addit...The effects of Ni content(0−2.10 wt.%)on the precipitated phase,strength and electrical conductivity of Cu−0.4wt.%Be alloy were investigated,and the influencing mechanism was analyzed.The results showed that the addition of Ni promoted the precipitation of strengthening phase in the alloy and remarkably enhanced the strengthening effect.When the Ni content was increased from 0 to 2.10 wt.%,the strength of the aged alloy initially increased and then decreased,and approached the maximum when the Ni content was 1.50 wt.%.The peak-aging parameters of the alloy containing 1.50 wt.%Ni were the aging temperature of 400℃ and the aging time of 60 min,where the tensile strength and yield strength of the aged alloy were 611 and 565 MPa,respectively,which were 2.8 times and 6.1 times those of the alloy without Ni.The electrical conductivity of the alloy with Ni increased with the aging time,and decreased with the increase of Ni content.With an increase of the aging time at 400℃,phase transition sequence of the Cu−0.4Be−1.5Ni alloy wasγ″phase→γ′phase→γphase.For the aging time of 60 min,a large number of dispersed nano-scale coherentγ″phase andγ′phase formed in the alloy with a remarkable strengthening effect,which was mainly responsible for the high strength of the alloy.展开更多
文摘The 500℃ isothermal section of the phase diagram of the Cu Be Ag (Cu≥50 at%) ternary system was investigated by X ray powder diffraction. The isothermal section consists of two single phase regions (namely α Cu and CuBe), two two phase regions (namely α Cu+Ag and CuBe+α Cu) and one three phase region (namely α Cu+Ag+CuBe). The maximum solubility of Be in α Cu and Ag in α Cu are about 6.6 at% and 0.8 at% respectively.
文摘The influence of aging treatment on the microstructure,mechanical properties and electrical conductivity of Cu-0.5 wt pct Be alloy for connector material applications was investigated.The properties of mechanical strength and electrical conductivity increase with increasing aging temperature and time.Microstructure of the aged Cu-Be alloy revealed that grain size and fraction of low angle and high angle grain boundary were not greatly changed;however,transmission electron microscopy （TEM） analysis exhibited that beryllides precipitation （CoBe and NiBe） with a size of 50 nm were distributed in grains.It was,therefore concluded that these beryllide precipitates improved the mechanical strength and also it was favor in improvement of electrical conductivity.
基金National Key Research and Development Program of China(2016YFB0301400)State Key Program of National Natural Science Foundation of China(U1502274)+1 种基金Innovation Scientists and Technicians Troop Construction Projects of Henan Province(C20150014)Program for Innovation Research Team(in Science and Technology)in University of Henan Province(14IRTSTHN007)
文摘利用X射线衍射(XRD)及差热分析(DSC)等方法研究了添加B对Zr Ti Cu Ni Be块状非晶合金的形成、结晶及热稳定性的影响·结果表明:在Zr Ti Cu Ni Be合金系中添加B可明显改变该合金的玻璃转变温度Tg,一次结晶温度Tx及过冷液相区ΔT等参数·当y(B)≤3%时,B的添加可使合金保持块状非晶,提高Tg、Tx并扩大过冷液相区,使非晶热稳定性增加;当y(B)≥6%时,B的添加将诱导大量的粗大Zr2Cu及ZrB2等晶体的析出·由于它们非纳米晶,尺寸较大,形状不规整,不能作为非晶复合材料的增强体·
基金supported by Materials Forming Processing Control and Simulation Laboratory in University of Science and Technology BeijingCNMC Ningxia Orient Group Co.,Ltd.
文摘In this paper,the evolutions of microstructure and mechanical properties of Cu-l.9Be-0.3Ni-0.15Co alloy were studied.The alloys in the condition of the solution treated（soft state） and 37% cold rolled（hard state） were aged at 320 ℃for different time,respectively.The mechanical properties,electrical conductivity and microstructure of the alloy aged for different time were analyzed.Additionally,the precipitation kinetics of Cu-1.9Be-0.3Ni-0.15Co alloys was investigated.X-ray diffraction and transmission electron microscopy results reveal that both continuous precipitation and discontinuous precipitation existed in the hard-state Cu-l.9Be-0.3Ni-0.15Co alloy during the whole aging process;the sequence of continuous precipitation is G.P.zone →γ″→γ′→γ.Furthermore,the precipitation transformation mechanism of softstate alloy is homogeneous nucleation,while hard-state alloy shows the heterogeneous nucleation（interface nucleation）with the nucleation rate of both states decaying rapidly to zero during aging at 320 ℃.
基金The authors would like to thank the support from the National Key R&D Programme of China(No.2016YFB0301404)the National Natural Science Foundation of China(51925401,92066205)the National Ten Thousand Talents Programme of China and Ningbo“Science and Technology Innovation 2025”major project(No.2019B10087).
文摘The effects of Ni content(0−2.10 wt.%)on the precipitated phase,strength and electrical conductivity of Cu−0.4wt.%Be alloy were investigated,and the influencing mechanism was analyzed.The results showed that the addition of Ni promoted the precipitation of strengthening phase in the alloy and remarkably enhanced the strengthening effect.When the Ni content was increased from 0 to 2.10 wt.%,the strength of the aged alloy initially increased and then decreased,and approached the maximum when the Ni content was 1.50 wt.%.The peak-aging parameters of the alloy containing 1.50 wt.%Ni were the aging temperature of 400℃ and the aging time of 60 min,where the tensile strength and yield strength of the aged alloy were 611 and 565 MPa,respectively,which were 2.8 times and 6.1 times those of the alloy without Ni.The electrical conductivity of the alloy with Ni increased with the aging time,and decreased with the increase of Ni content.With an increase of the aging time at 400℃,phase transition sequence of the Cu−0.4Be−1.5Ni alloy wasγ″phase→γ′phase→γphase.For the aging time of 60 min,a large number of dispersed nano-scale coherentγ″phase andγ′phase formed in the alloy with a remarkable strengthening effect,which was mainly responsible for the high strength of the alloy.
