张涛
块状非晶合金等亚材料的的制备与物性
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- 姓名:张涛
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学术头衔:
博士生导师, 国家杰出青年科学基金获得者
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学科领域:
材料科学基础学科
- 研究兴趣:块状非晶合金等亚材料的的制备与物性
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10
【期刊论文】Carbon-Nanotube-Reinforced Zr-Based Bulk Metallic Glass Composites and Their Properties**
张涛, By Zan Bian, Ru Ju Wang, Wei Hua Wang, * Tao Zhang, and Akihisa lnoue
,-0001,():
-1年11月30日
In this paper, we systematically report the preparation of carbon-nanotube (CNT)-reinforced Zr-based bulk metallic glass (BMG) composites. The physical and mechanical properties of the composites were investigated. Compressive testing shows that the composites still display high fracture strength. Investigation also shows that the composites have strong ultrasonic attenuation characteristics and excellent wave absorption ability. The strong wave absorption implies that CNT-reinforced Zr-based BMG composites, besides their excellent mechanical properties, may also have significant potential for applications in shielding acoustic sound or environmental noise.
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【期刊论文】New Bulk Glassy Ni-Based Alloys with High Strength of 3000MPa
张涛, Tao Zhang and Akihisa Inoue
Materials Transactions, Vol. 43, No.4 (2002) pp. 708 to 711,-0001,():
-1年11月30日
A new Ca-based bulk glassy alloy with high tensile fracture strength above 2000 MPa was formed in a (Cuo-6Zro.Btio-I)9sY2 alloy by copper mold casting. The maximum sample thickness for glass formation is 4 mrn for Cu6oZrBoTilo and increases to 5 mm for the 2%Y-containing alloy. The addition of 2%Y also causes an increase in the supercooled liquid region (Tx=Tx-Tg) from 36 to 50 K and in the reduced glass transition temperature (Tg/T1) from 0_62 to 0.63. The increase in the glass-forming ability (GFA) is presumably due to the increase in Atx and Tg/T1. The bulk glassy (Cuo.6Zro.BTio.1)98Y2 alloy exhibits good mechanical properties, i.e., 1780MPa for yield strength, 2030 MPa for tensile fracture strength, 2100 MPa for compressive fracture strength, 1.7% for elastic elongation and 1.5% for plastic elongation. The distinct plastic elongation indicates good ductile nature of the Ca-based bulk glassy alloy. The success of synthesizing the new Ca-based bulk glassy alloy with high GFA and good mechanical properties allows us to expect the extension of application fields as a new engineering material. (Received May 29, 2001; Accepted August 1, 2001)
nickel base alloy,, bulk glassy alloy,, glass transition,, supercooled liquid region,, reduced glass transition temperature,, high strength,, large elongation
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【期刊论文】Thermal and Mechanical Properties of Ca-Based Cu-Zr-Ti-Y Bulk Glassy Alloys
张涛, Tad Zhang, Kei Kurosaka * and Akihisa Indue
Materials Transactions, Vol. 42, No.10 (2001) pp. 2042 to 2045,-0001,():
-1年11月30日
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【期刊论文】Ductile quasicrystalline alloys
张涛, A. Inoue, T. Zhang, M. W. Chen, and T. Sakurai J. Saidaa) and M. Matsushita
,-0001,():
-1年11月30日
An icosahedral (I) quasicrystalline phase with a grain size below 40 nm was formed as a metastable phase in crystallization of the bulk glassy Zr65Al7.5Cu17.52xNi10Mx ~M5Ag, Pd, Au, or Pt; x55 nd 10 at %! alloys. The volume fraction (Vf) of the I phase is about 85% for the 5% M alloy and nearly 100% for the 10% M alloy. The I phase changes to Zr2Cu1Zr2Ni1Zr2Al3 in a fully annealed state. Compressive fracture strength (sc, f) and fracture elongation (e c, f) of the 10% Pd cylinder with a diameter of 2 mm are respectively 1640 MPa and 2.2% for the glassy phase and increase to 1830 MPa and 3.1% for the I phase. The increase in sc, f is due to the suppression effect of the I particles against the shear deformation of the intergranular glassy phase, and the increase in e c, f results from the localization effect of deformation into the glassy layer. The precipitation of the I phase implies that the glassy alloys include randomly oriented I configurations. The present work shows promise for the new class of high-strength nanoquasicrystalline materials.
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张涛, Tao Zhang and Akihisa Inoue
Materials Transactions, JIM, Vol. 39, No.8 (1998), pp. 857 to 862,-0001,():
-1年11月30日
Bulk amorphous Zr7o-x-yTixAlyCu20Nilo alloys with a thickness of 2.5 mm were formed in a wide composition range of 0 to 10 at% Ti and 7.5 to 15 at% Al by a squeeze casting process. The bulk amorphous alloys containing 0 to 5%Ti and 12.5 to 15/oAI exhibit good combined properties of high tensiIe fracture strength above 1850 MPa, high specific strength of 28..4 x 105 Nm/kg and high Tg/Tm above 0.60 which have not been obtained for the Zr-based alliorphous alloys reported hitherto. These bulk amorphous alloys have small difference in density of 0.3 to 0.6% between ascast amorphous and crystallized states. The high dense random packing fraction in the multicomponent amorphous structure seems to cause the high glass-for~iiing ability and the high thermal stability of the supercooled liquid region by the decrease in atomic mobility. Furthermore, the crystallized phases change from NiZr2+CuZr+Zr3Al in the range of 5 to 15%A1 and 0 to 2.5%Ti to NiZr I CuZr2 I Zr3A1 in the range of 5 to 15%A1 and 2.5 to 7.5%Ti. The melting temperatures (Tm) of these crystallized compounds increase in the order of ZrNi>ZrENi>ZrECU>ZrCu and hence the crystallized structure of the 5% Ti-containing alloys is composed of ZrNi and Zr2Cu with higher Tm-The change in the auLorphous structure leading to the precipitation of the compounds with higher Tm may be the reason for the higher iLechanical strength in the higher A1 and Zi contents.
bulk amorphous alloy,, high specific tensile strength,, squeeze casting,, low specific weight,, high dense packing fraction,, supercooled liquid,, glass transition,, glass-forming ability
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张涛, Akihisa Inoue, a) Tao Zhang, and Akira Takeuchi
,-0001,():
-1年11月30日
New bulk amorphous alloys exhibiting a wide supercooled liquid region before crystallization were found in Fe-(Co,Ni)-(Zr,Nb,Ta)-(Mo,W)-B systems. The Tg is as high as about 870 K and the supercooled liquid region reaches 88 K. The high thermal stability of the supercooled liquid enabled the production of bulk amorphous alloys with diameters up to 6 mm. These bulk amorphous alloys exhibit a high compressive strength of 3800 MPa, high Vickers hardness of 1360, and high corrosion resistance. Besides, the amorphous alloys exhibit a high magnetic-flux density of 0.74-0.96 T, low coercivity of 1.1-3.2 A/m, high permeability exceeding 1.2 104 at 1 kHz, and low magnetostriction of about 12X 10-6.
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张涛, Akihisa Indue and Tad Zhang
Materials Transactions. JIM, Vol. 37, No.2 (1996), pp. 185 to 187,-0001,():
-1年11月30日
A bulk glassy Zr55Al,oNi5Cu30 alloy in a cylindrical form with a diameter of 30 mm and a length of 50 mm was produced by sucking the molten alloy into a copper mold. The sucking force was generated from the rapid movement (5.O m/s) of piston with a diameter of 30 mm which was set at the center of the copper hearth. The sucking velocity is eval uated to be as high as 22.1 kg/s_ Neither cavity nor hole is seen in the transverse cross section of the bulk glassy alloy. The glass transition temperature (Zg), crystallization temperature (Tx) and supercooled liquid region defined by AXTx(-Tx-Tg) are nearly the same as those for the melt-spun glassy ribbon with a thickness of 30 Bm, in spite of the significant difference in sample thickness by three orders. Furthermore. there is no appreciable difference in Tg, Tx and A Zx over the whole cast sample. The Vickers hardness number is 523, in agreement with that (=510) for the corresponding melt-spun glassy ribbon and cast bulk glassy cylinders with diameters below 15 rim. Thus, the direct production of the bulk glassy alloy with a diameter of 30 mm by the suction casting method is important for the future development of bulk glassy alloys.
bulk glassy alloy,, zirconium base alloy system,, suction casting,, high speed casting,, large glass-forming ability,, glass transition,, supercooled liquid region
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【期刊论文】Preparation of 16 mm Diameter Rod of Amorphous Zr65 AI7.5 Ni10 Cu17.5 Alloy
张涛, A. Indue. T. Zhang. N. Nishiyamat. K. Ohbatt and Y. Masumoto
Materials Transactions. JIM. Vol. 34. No.12. (1993). pp. 1234 to 1237,-0001,():
-1年11月30日
Bulky amorphous alloys in a cylindrical shape with diameters up to 16 mm, were found to form by water quenching a Zr65Alv.sNitofU17.5 melt in a quartz tube. The amorphous phase of this alloy has the widest temperature interval of supercooled liquid region before crystallization. The glass transition temperature, crystallization teialperature and Vickers hardness for the bulky amorphous alloy with a diameter of 16 mm are 625 K. 750 K and 465. respectively, being nearly the same as those for the corresponding melt-spun ribbon with a thickness of 30um. The extrei]]ely large glassforming ability is presumably due to a combination of significantly different atomic size ratios among the constituent elements and the necessity of redistribution of A1 for the progress of crystallization. The finding of the extremely large glass-forming ability has a very important implication because it demonstrates the possibility of bulk amorphous alloy production by conventional casting processes.
glass-forming ability,, zirconium base alloy,, bulky amorphous alloy,, water quenching,, low critical cooling rate
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张涛, Tab Zhang*, Akihisa Inoue** and Tsuyoshi Masumoto**
Materials Transactions. JIM. Vol. 32. No.11 (1991). pp. 1005 to 1010,-0001,():
-1年11月30日
Amorphous alloys exhibiting a wide supercooled liquid region above 100 K were found to form in a compositional range from 0 to 3%Co, O to 15%Ni and 10 to 23%Cu in Zr65A17.sCuz.5(Co1-x-yNixCuy)25 systcma by melt spinning. The temperature span AT(-T-Tg) between glass transition temperature (Tg) and crystallization temperature (T)reaches as large as 127 K for Zr65Alv_5Ni1oCu17.5. The Tg and hardness (My) increase from 622 to 685 K and 426 to 502 with increasing Co content while the T~ decreases from 749 to 690 K. resulting in the decrease of ATx from 127 to 30 K with increasing Co content. The compositional effect on Tg, Tx, A T and My indicates that there is no close relation between the magnitude of the attractive bonding force and the stability of the supercooled liquid. The high stability of the supercooled liquid against the nucleation and growth of a crystalline phase in the limited composition range seems to result froxl a highly dense random packing structure consisting of atoms with an optimum atomic size ratio and a large negative enthalpy of mixing.
amorphous phase,, zirconium-aluminum-nickel-copper alloy,, wide supercooled liquid region,, glass transition,, melt spinning,, thermal stability
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张涛, By Akihisa Inoue*, Tao Zhang** and Tsuyoshi Masumoto*
Materials Transactions. JIM. Vol. 31, No.5 (1990), pp. 425 to 428,-0001,():
-1年11月30日
A low pressure casting of a La55Al25Ni20 melt into a copper mold was found to bring about an amorphous bulk in cylindrical or sheet form. The maximum diameter of the amorphous cylinder and the maximum thickness of the amorphous sheet with a width of 5.0 mm were about 3.0 and 2.3 mm, respectively. In comparison with the thermal properties of a melt-spun amorphous La55Al25Ni20 ribbon, the amorphous bulks had a higher onset temperature and a smaller heat evolution of irreversible structural relaxation, but there was no distinct difference in glass transition and crystallization behavior. Thus. the amorphous phase produced by casting had a more relaxed atomic configuration as compared with that for the melt-spun ribbon, but there was no difference in the specific heat curves during reheating for both of the samples heated up to the supercooled liquid region. This is believed to be the first evidence that amorphization takes place by casting into a copper mold. The amorphization allows us to reconfirm an extremely large glass-forming capacity of the La-A1-Ni amorphous alloy as previously found by the present authors.
metallic mold casting,, amorphous phase,, lanthanum-aluminum-nickel alloy,, amorphous bulk., structural relaxation,, glass transition
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