Materials Transactions Jim最新文献_第7页

Glass Transition, Viscosity of the Supercooled Liquid and Crystallization Behaviour of Zr–Al–Cu–Ni–Fe Metallic Glasses Zr-Al-Cu-Ni-Fe金属玻璃的玻璃化转变、过冷液粘度和结晶行为

Materials Transactions Jim Pub Date : 2000-11-20 DOI: 10.2320/MATERTRANS1989.41.1415

J. Eckert, A. Kübler, A. Reger-Leonhard, A. Gebert, M. Heilmaier

{"title":"Glass Transition, Viscosity of the Supercooled Liquid and Crystallization Behaviour of Zr–Al–Cu–Ni–Fe Metallic Glasses","authors":"J. Eckert, A. Kübler, A. Reger-Leonhard, A. Gebert, M. Heilmaier","doi":"10.2320/MATERTRANS1989.41.1415","DOIUrl":"https://doi.org/10.2320/MATERTRANS1989.41.1415","url":null,"abstract":"The effect of iron on the glass transition, the viscosity of the supercooled liquid and the crystallization behaviour of (Zr 0.650 Al 0.075 Cu 0.175 Ni 0.100 ) 100-x Fe x and (Zr 0.55 Al 0.10 Cu 0.30 Ni 0.05 ) 100-x Fe x metallic glasses (0 ≤ x ≤ 15) was investigated using parallel plate rheometry, differential scanning calorimetry and X-ray diffraction. Iron additions shift the glass transition as well as the crystallization to higher temperatures, and increase the viscosity of the supercooled liquid. Increasing iron content reduces the extension of the supercooled liquid region. This mainly results from a stronger composition dependence of the glass transition than the crystallization temperature. The results are discussed with respect to the kinetics and thermodynamics of the supercooled liquid suggesting that changes in the atomic arrangement and in the free volume are the microscopic origin for the differences in the viscosity and the thermal stability of the alloys. All investigated alloys are rather strong glasses as expressed by a relatively high melt viscosity, a low Vogel-Fulcher Tammann (VFT) temperature and a rather high fragility parameter, but in general (Zr 0.55 Al 0.10 Cu 0.30 Ni 0.05 ) 100-x Fe x alloys are slightly stronger glasses than (Zr 0.650 Al 0.075 Cu 0.175 Ni 0.100 ) 100-x Fe x alloys.","PeriodicalId":18264,"journal":{"name":"Materials Transactions Jim","volume":"1 1","pages":"1415-1422"},"PeriodicalIF":0.0,"publicationDate":"2000-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90204147","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 9

Effects of Thermal Treatment on Structure of Fe-Co-Ni-Zr-B Glassy Alloy with a Large Supercooled-Liquid Region Studied by Mossbauer Spectroscopy 穆斯堡尔光谱研究热处理对Fe-Co-Ni-Zr-B大过冷区玻璃合金组织的影响

Materials Transactions Jim Pub Date : 2000-11-20 DOI: 10.2320/MATERTRANS1989.41.1392

T. Itoi, H. Onodera, S. Miura, A. Inoue

{"title":"Effects of Thermal Treatment on Structure of Fe-Co-Ni-Zr-B Glassy Alloy with a Large Supercooled-Liquid Region Studied by Mossbauer Spectroscopy","authors":"T. Itoi, H. Onodera, S. Miura, A. Inoue","doi":"10.2320/MATERTRANS1989.41.1392","DOIUrl":"https://doi.org/10.2320/MATERTRANS1989.41.1392","url":null,"abstract":"Structural change in the supercooled-liquid region of Fe 58 Co 7 Ni 7 Zr 8 B 20 glassy alloy has been examined by Mossbauer spectroscopy Analyses of the Mossbauer spectra showed that the hyperfine field distribution patterns in quenched states from supercooled-liquid state differ from that in the as-melt-spun state. As the quenching temperature increases, the hyperfine field distribution tends to show several peaks some of whose hyperfine field values seem to correspond well to those in crystalline Fe, Fe 3 B, Fe 2 B and Fe 2 Zr, although these distribution peaks are quite broad. These results as well as the initial crystallization behavior indicate that the thermal treatment in the supercooled-liquid region causes a compositional short-range order. It is, however, supposed that the chemical bond strengths are competitive among the Fe 3 B-Fe 2 B-, FeZr 2 - and Fe-Zr-B-type compositional short-range order, and their growth frustrate each other in the supercooled-liquid region. This competitive frustration should be one of the reasons for the thermal stability against crystallization that occurs in the glassy alloys with a large supercooled-liquid region.","PeriodicalId":18264,"journal":{"name":"Materials Transactions Jim","volume":"5 1","pages":"1392-1396"},"PeriodicalIF":0.0,"publicationDate":"2000-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80906334","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Solidification behaviour of rapidly quenched Cu-Sn alloys 快速淬火Cu-Sn合金的凝固行为

Materials Transactions Jim Pub Date : 2000-11-20 DOI: 10.2320/MATERTRANS1989.41.1575

J. Mahmoudi, H. Fredriksson

引用次数: 2

Role of atomic size on glass formability and thermal stability of Al-based amorphous alloys : Special issue on bulk amorphous, nano-crystalline and nano-quasicrystalline alloys 原子尺寸对al基非晶合金玻璃成形性和热稳定性的影响:大块非晶、纳米晶和纳米准晶合金专刊

Materials Transactions Jim Pub Date : 2000-11-20 DOI: 10.2320/MATERTRANS1989.41.1406

F. Guo, S. Enouf, G. Shiflet, J. Poon

引用次数: 23

Thermal expansion and specific volume of Pd40Cu30Ni10P20 alloy in various states Pd40Cu30Ni10P20合金在不同状态下的热膨胀和比容

Materials Transactions Jim Pub Date : 2000-11-20 DOI: 10.2320/MATERTRANS1989.41.1432

N. Nishiyama, M. Horino, A. Inoue

{"title":"Thermal expansion and specific volume of Pd40Cu30Ni10P20 alloy in various states","authors":"N. Nishiyama, M. Horino, A. Inoue","doi":"10.2320/MATERTRANS1989.41.1432","DOIUrl":"https://doi.org/10.2320/MATERTRANS1989.41.1432","url":null,"abstract":"We measured the thermal expansion and specific volume of the Pd 40 Cu 30 Ni 10 P 20 alloy by thermomechanical analyzer (TMA), fluid (H 2 O) displacement and volume dilatometric methods. At room temperature (293 K), the specific volumes of the Pd 40 Cu 30 Ni 10 P 20 alloy in the relaxed glassy and crystalline states are 0.1070 and 0.1065 m 3 /Mg, respectively. The average linear coefficients of thermal expansion are 17.0 x 10 -6 K -1 at 323 to 523 K in the relaxed glassy state (α relax ), 14.2 x 10 -6 K -1 at 323-673 K in the crystalline state (α cry ) and 39.9 x 10 -6 K -1 at 873-1223 K in the liquid (α liq ). Based on these results, the specific volume of the Pd 40 Cu 30 Ni 10 P 20 alloy as a function of temperature, V(T), is estimated. The extrapolation line of the specific volume for the equilibrium liquid is smoothly connected to the specific volume for the supercooled liquid. On the other hand, the intersection point of the specific volume between the extrapolation of equilibrium liquid and crystal is evaluated at 527 K. In the assumption that the temperature of the intersection point corresponds to the entropic stability limit for the undercooled liquid, it is much lower than that of previous thermodynamic study.","PeriodicalId":18264,"journal":{"name":"Materials Transactions Jim","volume":"21 1","pages":"1432-1434"},"PeriodicalIF":0.0,"publicationDate":"2000-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87351909","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 30

Calculations of mixing enthalpy and mismatch entropy for ternary amorphous alloys : Special issue on bulk amorphous, nano-crystalline and nano-quasicrystalline alloys 三元非晶合金混合焓和失配熵的计算:大块非晶、纳米晶和纳米准晶合金专刊

Materials Transactions Jim Pub Date : 2000-11-20 DOI: 10.2320/MATERTRANS1989.41.1372

A. Takeuchi, A. Inoue

{"title":"Calculations of mixing enthalpy and mismatch entropy for ternary amorphous alloys : Special issue on bulk amorphous, nano-crystalline and nano-quasicrystalline alloys","authors":"A. Takeuchi, A. Inoue","doi":"10.2320/MATERTRANS1989.41.1372","DOIUrl":"https://doi.org/10.2320/MATERTRANS1989.41.1372","url":null,"abstract":"Chemical mixing enthalpy (ΔH chem ) and mismatch entropy normalized by Boltzmann constant (S σ /k B ) corresponding to the three empirical rules for the achievement of high amorphous-forming ability (AFA) were calculated with thermodynamical functions for the gross number of 6450 alloys in 351 ternary amorphous systems. The temary amorphous alloys have ΔH chem of -86 to 25 kJ/mol and S σ /k B of 1.0 × 10 -3 to 5.7. The average values of ΔH chem and S σ /k B are calculated to be -33 kJ/mol and 0.33, respectively. The 30 alloys in 9 ternary amorphous systems including 10 alloys in Ag-Cu-Fe system have positive values of ΔH chem . Most of the ternary amorphous alloys have the values of ΔH chem and S σ /k B inside a trapezoid regicn in ΔH chem - log(S σ /k B ) chart except mainly for the H- and the C-containing alloys. Si-W-Zr system and the 32 alloys having positive values of ΔH chem . The analysis of AFA was carried out for typical five ternary amorphous systems. The following four results are derived. 1) Al-La-Ni and B-Fe-Zr alloys have high AFA in accordance with the concept of the three empirical rules. 2) The further multiplication of alloy components causes an increase in the AFA of Al-B-Fe alloys. 3) Thermodynamical factors represented by melting temperature and viscosity at the melting temperature are required for evaluation of AFA for Mg- and Pd-based amorphous alloys. 4) A tendency for log(S σ /k B ) to increase with decreasing ΔH chem is recognized in each alloys system, implying the stabilization of an amorphous phase against solid solution and intermediate phase.","PeriodicalId":18264,"journal":{"name":"Materials Transactions Jim","volume":"49 1","pages":"1372-1378"},"PeriodicalIF":0.0,"publicationDate":"2000-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82202389","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 631

Single Crystal Solidification of Undercooled Single-phase Alloys 过冷单相合金的单晶凝固

Materials Transactions Jim Pub Date : 2000-11-20 DOI: 10.2320/MATERTRANS1989.41.1569

G. S. Song, M. Lee, W. Kim, D. H. Kim, Zhen Zhang, Xin Lin, Gencang Yang, Yaohe Zhou

引用次数: 4

Synthesis and Mechanical Properties of Zr 55 Al 10 Ni 5 Cu 30 Bulk Glass Composites Containing ZrC Particles Formed by the In-Situ Reaction 原位反应制备zr55 Al - 10 Ni - 5 Cu - 30块状玻璃复合材料及其力学性能

Materials Transactions Jim Pub Date : 2000-11-01 DOI: 10.2320/MATERTRANS1989.41.1454

T. Hirano, H. Kato, A. Matsuo, Y. Kawamura, A. Inoue

引用次数: 44

Oxidation Behavior of Ti3Al–xNb (x=0, 3, 7, 11, 13 at%) at 1073–1273 K in Air Ti3Al-xNb (x= 0,3,7,11,13 at%)在1073-1273 K空气中的氧化行为

Materials Transactions Jim Pub Date : 2000-10-20 DOI: 10.2320/MATERTRANS1989.41.1297

Y. Park, W. Fang, Cha-Hurn Bae

引用次数: 4

The Effect of Test Machine Compliance on the Measured Shear Punch Yield Stress as Predicted Using Finite Element Analysis 试验机顺应性对用有限元分析预测的剪切冲床屈服应力的影响

Materials Transactions Jim Pub Date : 2000-10-20 DOI: 10.1520/STP10831S

M. Toloczko, K. Abe, M. L. Hamilton, F. Garner, R. Kurtz

{"title":"The Effect of Test Machine Compliance on the Measured Shear Punch Yield Stress as Predicted Using Finite Element Analysis","authors":"M. Toloczko, K. Abe, M. L. Hamilton, F. Garner, R. Kurtz","doi":"10.1520/STP10831S","DOIUrl":"https://doi.org/10.1520/STP10831S","url":null,"abstract":"In previous research involving the use of the shear punch test, it was assumed that the displacement of the punch tip was only slightly different than the crosshead displacement. The present work explores this assumption and its ramifications by simulating the shear punch test with finite element analysis (FEA). The simulations suggest that punch tip displacement is much less than previously assumed, and that for the test frames which have been used, crosshead displacement is over an order of magnitude greater than punch tip displacement. This difference in displacements is thought to be due to test machine and punch compliance, and a simple elasticity calculation of the compliance of the punch, the test machine, and a specimen gives a result which is in agreement with the FEA simulations. The effect of using punch tip displacement on the observed effective shear yield stress was evaluated using FEA simulated shear punch tests on several different metals. Yield was measured at several different offset shear strains with a 1.0% offset shear yield strength measurement providing the best correlation with 0.2% offset uniaxial yield strength. When using the 1.0% offset shear yield values, the previously observed material-to-material variability in the tensile-shear correlation all butmore » disappeared. Based on this work, it appears that the material-to-material variations in prior correlations between uniaxial yield strength and shear yield strength is due to a combination of large test machine compliance and material-to-material differences in the work hardening exponent.« less","PeriodicalId":18264,"journal":{"name":"Materials Transactions Jim","volume":"34 1","pages":"1356-1359"},"PeriodicalIF":0.0,"publicationDate":"2000-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75339010","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 12