Acta Metallurgica最新文献_第6页

The temperature dependence of grain boundary segregation in NiIn bicrystals studied with auger electron spectroscopy 用俄歇电子能谱研究了Ni双晶中晶界偏析的温度依赖性

Acta Metallurgica Pub Date : 1989-11-01 DOI: 10.1016/0001-6160(89)90326-X

T. Muschik, W. Gust, S. Hofmann, B. Predel

{"title":"The temperature dependence of grain boundary segregation in NiIn bicrystals studied with auger electron spectroscopy","authors":"T. Muschik, W. Gust, S. Hofmann, B. Predel","doi":"10.1016/0001-6160(89)90326-X","DOIUrl":"10.1016/0001-6160(89)90326-X","url":null,"abstract":"<div>Auger electron spectroscopy has been used to study indium grain boundary segregation in symmetric «110å tilt boundaries and randomly oriented boundaries in bicrystals as well as polycrystals of NiIn containing 0.l–1.4 at. % In. Quench-induced non-equilibrium segregation of In, caused by fluxes of In vacancy complexes to the interfaces, influenced the results for quenching temperatures above 1000–1100 K. A careful analysis of sputtering profiles supplied additional informations for the discussion with respect to current models of QINS. From the equilibrium segregation behaviour for the symmetric boundaries both the segregation enthalpies (ΔHse = 38 ± 3 kJ/mol and ΔHseg = 39 ± 3 kJ/mol) and the mean segregation entropy [ΔSseg = (0 ± 0.5)R] have been determined for the first time. The segregation free energy for 970 K is ΔGseg = 50 ± 5 kJ/mol for the polycrystals. The symmetric atomic arrangement along the tilt boundaries is assumed to be responsible for the low segregation entropy.</div>","PeriodicalId":6969,"journal":{"name":"Acta Metallurgica","volume":"37 11","pages":"Pages 2917-2925"},"PeriodicalIF":0.0,"publicationDate":"1989-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0001-6160(89)90326-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81613577","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: 18

Estimation of the geometrical rate constant in idealized three dimensional grain growth 理想三维晶粒生长几何速率常数的估计

Acta Metallurgica Pub Date : 1989-11-01 DOI: 10.1016/0001-6160(89)90333-7

W.W. Mullins

引用次数: 81

Toughening in composites of Al2O3 reinforced with Al Al增强Al2O3复合材料的增韧研究

Acta Metallurgica Pub Date : 1989-11-01 DOI: 10.1016/0001-6160(89)90336-2

B.D. Flinn, M. Rühle , A.G. Evans

引用次数: 180

Microcrack-enhanced creep in polycrystalline material at elevated temperature 高温下多晶材料的微裂纹增强蠕变

Acta Metallurgica Pub Date : 1989-11-01 DOI: 10.1016/0001-6160(89)90346-5

N.K. Sinha

引用次数: 30

A test procedure for characterizing the toughening of brittle intermetallics by ductile reinforcements 用韧性增强物表征脆性金属间化合物增韧的试验程序

Acta Metallurgica Pub Date : 1989-11-01 DOI: 10.1016/0001-6160(89)90332-5

H.C. Cao, B.J. Dalgleish, H.E. Dève, C. Elliott, A.G. Evans, R. Mehrabian, G.R. Odette

引用次数: 90

Radiation-enhanced phase separation in amorphous Fe40Ni40P20 辐射增强非晶Fe40Ni40P20的相分离

Acta Metallurgica Pub Date : 1989-11-01 DOI: 10.1016/0001-6160(89)90331-3

R. Gerling, F.P. Schimansky, R. Wagner

引用次数: 8

Thermodynamics of the bainitic transformation in a CuZn alloy CuZn合金贝氏体相变热力学

Acta Metallurgica Pub Date : 1989-11-01 DOI: 10.1016/0001-6160(89)90344-1

T.Y. Hsu (Xu Zuyao), Zhou Xiaowang

引用次数: 1

The influence of Mn dispersoid content and stress state on ductile fracture of 2134 type Al alloys Mn弥散体含量和应力状态对2134型铝合金韧性断裂的影响

Acta Metallurgica Pub Date : 1989-11-01 DOI: 10.1016/S0001-6160(89)80001-X

J.A. Walsh , K.V. Jata , E.A. Starke Jr

{"title":"The influence of Mn dispersoid content and stress state on ductile fracture of 2134 type Al alloys","authors":"J.A. Walsh , K.V. Jata , E.A. Starke Jr","doi":"10.1016/S0001-6160(89)80001-X","DOIUrl":"10.1016/S0001-6160(89)80001-X","url":null,"abstract":"<div>Ductile fracture studies have been conducted on four high purity Al<img>Cu<img>Mg<img>Zr (2134 type) alloys containing 0, 0.31. 0.61 and 1.02 wt% Mn in the under and overaged conditions having similar yield strengths. The second phase particle content, i.e, Mn rich dispersoids and Mn containing large particles, increased with increasing Mn content. In both aging conditions maximum ductility and toughness were observed for the 0.31% Mn alloy and minimum values were observed for the 1.02% Mn alloy, The largest void content or damage accumulation due to void nucleation and growth at any strain level occurred in the 1.02% Mn alloy, consistent with ductility values. The 0.31% Mn alloy showed the highest ductility in both aging conditions, Although the void volume fractions for the 0.31% Mn alloy were similar to those of the 1.02% Mn alloy, accumulation occurred at higher strains. The void nucleation and growth data and microstructural analysis suggest that the 0.31% Mn additions provide sufficient submicrometer Mn-dispersoids to homogenize slip without producing large Mn-rich primary particles which decrease ductility. Ductility was observed to decrease with increasing triaxial constraint which increased void volume fraction and void growth rates. However, the degree of triaxiality had little or no effect on the nucleation rate of voids.</div>","PeriodicalId":6969,"journal":{"name":"Acta Metallurgica","volume":"37 11","pages":"Pages 2861-2871"},"PeriodicalIF":0.0,"publicationDate":"1989-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0001-6160(89)80001-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80064155","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: 78

Cyclic deformation of α-β brass two-phase bicrystals—I. Slip behavior α-β黄铜两相双晶的循环变形。滑移行为

Acta Metallurgica Pub Date : 1989-11-01 DOI: 10.1016/0001-6160(89)90323-4

H. Kawazoe , T. Takasugi , O. Izumi

引用次数: 9

Thermodynamics of the α- and β-phases equilibria and ordering in CuZn system CuZn体系中α-和β-相平衡及有序热力学

Acta Metallurgica Pub Date : 1989-11-01 DOI: 10.1016/0001-6160(89)90342-8

Zhou Xiaowang, T.Y. Hsu (Xu Zuyao)

{"title":"Thermodynamics of the α- and β-phases equilibria and ordering in CuZn system","authors":"Zhou Xiaowang, T.Y. Hsu (Xu Zuyao)","doi":"10.1016/0001-6160(89)90342-8","DOIUrl":"10.1016/0001-6160(89)90342-8","url":null,"abstract":"<div>For both the solid solutions α and β, composed of Cu and Zn, approximated by the regular solutions, the interaction parameters Eα and Eβ of components in the a and β phases are calculated with the experimental activities. By the application of lattice stability parameters ΔGCuβ→α and ΔZnβ→α of Cu and Zn, which are obtained from the phase diagram of CuZn system in this paper, a general formula for ΔGβ→α is derived. On the basis of Inden formula for the change of free energy ΔGβ→β′ in the β→β′ ordering transition, it is proposed, through discussing the critical temperature Tc of ordering and ordering degree as a function of temperature, that the theoretical maximum ordering degree can not be obtained for an alloy with given composition. The maximum ordering degree attained is approximately independent of composition for alloys with XZn = 0.35–0.65, so an approximate equation for ordering degree as a function of temperature is suggested. This equation is used to calculate the <math><mtext>α</mtext><mtext>(α + β′)</mtext></math> and <math><mtext>β′</mtext><mtext>(α + β′)</mtext></math> phase boundaries of CuZn system, and the results are in good agreement with the phase diagram.</div>","PeriodicalId":6969,"journal":{"name":"Acta Metallurgica","volume":"37 11","pages":"Pages 3085-3090"},"PeriodicalIF":0.0,"publicationDate":"1989-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0001-6160(89)90342-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74706400","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: 10