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Comparative behavior of carbon in b.c.c. and f.c.c. iron 碳在b.c.c和f.c.c铁中的比较行为
Acta Metallurgica Pub Date : 1989-10-01 DOI: 10.1016/0001-6160(89)90310-6
V. Rosato
{"title":"Comparative behavior of carbon in b.c.c. and f.c.c. iron","authors":"V. Rosato","doi":"10.1016/0001-6160(89)90310-6","DOIUrl":"10.1016/0001-6160(89)90310-6","url":null,"abstract":"<div><p>We have investigated the different behavior of a carbon atom in b.c.c. and f.c.c. metal lattices (α and γ iron lattices) by means of Molecular Dynamics computer simulations. We have evaluated the structural response or the host to the presence of the intrusion in terms of lattice distortion and the relevant thermodynamic properties related to the solute-solvent interaction (site energy, migration energy, diffusion paths, interaction with the host point defects).</p></div>","PeriodicalId":6969,"journal":{"name":"Acta Metallurgica","volume":"37 10","pages":"Pages 2759-2763"},"PeriodicalIF":0.0,"publicationDate":"1989-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0001-6160(89)90310-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82908108","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: 60
The characterization of misfit dislocations at {100} heterojunctions in III–V compound semiconductors III-V型化合物半导体{100}异质结错配位错的表征
Acta Metallurgica Pub Date : 1989-10-01 DOI: 10.1016/0001-6160(89)90312-X
B.C. De Cooman, C.B. Carter, Kam Toi Chan, J.R. Shealy
{"title":"The characterization of misfit dislocations at {100} heterojunctions in III–V compound semiconductors","authors":"B.C. De Cooman,&nbsp;C.B. Carter,&nbsp;Kam Toi Chan,&nbsp;J.R. Shealy","doi":"10.1016/0001-6160(89)90312-X","DOIUrl":"10.1016/0001-6160(89)90312-X","url":null,"abstract":"<div><p>Strain localization at near-lattice-mismatched (100) semiconductor heterojunctions results in the formation of dislocations due to plastic deformation of the epilayer at low temperatures. A geometric model for this deformation has been presented which predicts the main features of these dislocation arrays at the heterojunction. In a full analysis of these dislocations, both the dissociated nature of the dislocations and their <span><math><mtext>α</mtext><mtext>β</mtext></math></span>character must be taken into account. The model has been tested by analyzing the arrangement and character of dislocations present in (Ga,In)As/GaAs and (Ga, In)P/GaAs heterostructures. It is shown that the dislocations geometries differ significantly depending on whether the epilayer was in tension or compression during growth.</p></div>","PeriodicalId":6969,"journal":{"name":"Acta Metallurgica","volume":"37 10","pages":"Pages 2779-2793"},"PeriodicalIF":0.0,"publicationDate":"1989-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0001-6160(89)90312-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73728717","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: 22
Temperature dependence of the shape of ZnO grains in a liquid matrix 液体基质中ZnO晶粒形状的温度依赖性
Acta Metallurgica Pub Date : 1989-10-01 DOI: 10.1016/0001-6160(89)90304-0
Joo-Hwan Han , Young-Keun Chung , Doh-Yeon Kim , Sang-Hee Cho , Duk N. Yoon
{"title":"Temperature dependence of the shape of ZnO grains in a liquid matrix","authors":"Joo-Hwan Han ,&nbsp;Young-Keun Chung ,&nbsp;Doh-Yeon Kim ,&nbsp;Sang-Hee Cho ,&nbsp;Duk N. Yoon","doi":"10.1016/0001-6160(89)90304-0","DOIUrl":"10.1016/0001-6160(89)90304-0","url":null,"abstract":"<div><p>The shape of ZnO grains in Bi<sub>2</sub>O<sub>3</sub> liquid solution is investigated as a function of temperature. The grains of a characteristic angular shape at low temperature become spherical with the increase of temperature. The grain shape dispersed in liquid is discussed in terms of interfacial energy minimization and growth (dissolution) rate during Ostwald ripening.</p></div>","PeriodicalId":6969,"journal":{"name":"Acta Metallurgica","volume":"37 10","pages":"Pages 2705-2708"},"PeriodicalIF":0.0,"publicationDate":"1989-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0001-6160(89)90304-0","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76012805","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: 20
The role of grain boundary compatibility in fatigue cracking of aluminum bicrystals 晶界相容性在铝双晶疲劳开裂中的作用
Acta Metallurgica Pub Date : 1989-10-01 DOI: 10.1016/0001-6160(89)90297-6
Chingshen Li , T. Bretheau
{"title":"The role of grain boundary compatibility in fatigue cracking of aluminum bicrystals","authors":"Chingshen Li ,&nbsp;T. Bretheau","doi":"10.1016/0001-6160(89)90297-6","DOIUrl":"10.1016/0001-6160(89)90297-6","url":null,"abstract":"<div><p>The effect of grain boundaries on the cyclic deformation and fatigue crack growth in aluminum bicrystals has been studied. The incompatible primary slip by the two sides of a grain boundary creates heterogeneous slips in a narrow area beside the boundary and cracks along the boundary. The area, termed as Grain Boundary Affecting Zone (GBAZ). is characteristic of heterogeneous deformation as well as internal stresses. As an extended stage I crack grows into the GBAZ under constant cyclic stress, the crack branches and splits deviating from the favorable crack path along a primary persistent slip band (PSB). at the same time, it decelerates or even stops to grow. The microstructure-sensitive growth behavior of extended stage I cracks across grain boundaries in aluminum bicrystals accompanying the crack tip sheilding in GBAZs is refered to the compatibility requirement at the boundaries.</p></div>","PeriodicalId":6969,"journal":{"name":"Acta Metallurgica","volume":"37 10","pages":"Pages 2645-2650"},"PeriodicalIF":0.0,"publicationDate":"1989-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0001-6160(89)90297-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77436733","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: 25
Cross-slip patterns by sphere indentations on single crystal MnZn ferrite 单晶MnZn铁氧体球面压痕的交叉滑移模式
Acta Metallurgica Pub Date : 1989-10-01 DOI: 10.1016/0001-6160(89)90295-2
S.E. Kadijk, A.Broese Van Groenou
{"title":"Cross-slip patterns by sphere indentations on single crystal MnZn ferrite","authors":"S.E. Kadijk,&nbsp;A.Broese Van Groenou","doi":"10.1016/0001-6160(89)90295-2","DOIUrl":"10.1016/0001-6160(89)90295-2","url":null,"abstract":"<div><p>The experiments on the deformation of crystals of MnZn ferrite by indentation with a loaded sphere are extended to (111) planes. As shown before on (001) and (110) planes the deformation consists of coupled slip lines. The slip patterns are discussed in terms of the possible slip planes for a Burgers vector along 〈110〉. A complete description is given on the assumption of cross slip between the slip systems, {110}, {111} and {100}. The analysis is supported by calculations of the resolved shear stress (RSS) on the basis of the elastic equations for a halfspace loaded by a sphere. The source of dislocations is located where the RSS is largest. On the assumption that propagation of slip is easier than nucleation, several cases of coupled slip (“pencil glide”) are considered. A check on the model is made by calculating the length of the slip lines on the surface between the start and the cross-over. The experimental data show a wide spread, but on the average they agree with the model. {100} and {111} appear as primary slip systems when the RSS is sufficient. {100} is excited only in cross-slip, at about the same RSS values as for {100} and {111}. The RSS where propagation stops, show a wide spread too, 0.6–1.8 GPa, but the lowest minimum is found for {100}.</p></div>","PeriodicalId":6969,"journal":{"name":"Acta Metallurgica","volume":"37 10","pages":"Pages 2625-2634"},"PeriodicalIF":0.0,"publicationDate":"1989-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0001-6160(89)90295-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90974522","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: 14
Free energies of undercooled phases 过冷相的自由能
Acta Metallurgica Pub Date : 1989-10-01 DOI: 10.1016/0001-6160(89)90313-1
P. Ramachandrarao , K.S. Dubey , S. Lele
{"title":"Free energies of undercooled phases","authors":"P. Ramachandrarao ,&nbsp;K.S. Dubey ,&nbsp;S. Lele","doi":"10.1016/0001-6160(89)90313-1","DOIUrl":"10.1016/0001-6160(89)90313-1","url":null,"abstract":"<div><p>A novel approach for the estimation of the free energies of metastable liquid and allotropie phases has been presented. The method is based on the Taylor series expansion of the free energy différence between stable and metastable phases. The procedure has been applied to arrive at allotropie transformation temperatures in iron and also the isentropic temperature for any two coexisting phases. Results obtained strongly validate the expressions derived which involve only the use of equilibrium heat capacity and entropy data.</p></div>","PeriodicalId":6969,"journal":{"name":"Acta Metallurgica","volume":"37 10","pages":"Pages 2795-2799"},"PeriodicalIF":0.0,"publicationDate":"1989-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0001-6160(89)90313-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76926726","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: 11
The accommodation of misfit at {100} heterojunctions in III–V compound semiconductors by gliding dissociated dislocations 滑动解离位错对III-V型化合物半导体{100}异质结错配的调节
Acta Metallurgica Pub Date : 1989-10-01 DOI: 10.1016/0001-6160(89)90311-8
B.C. De Cooman, C.B. Carter
{"title":"The accommodation of misfit at {100} heterojunctions in III–V compound semiconductors by gliding dissociated dislocations","authors":"B.C. De Cooman,&nbsp;C.B. Carter","doi":"10.1016/0001-6160(89)90311-8","DOIUrl":"10.1016/0001-6160(89)90311-8","url":null,"abstract":"<div><p>The formation of dislocations at lattice-mismatched (100) semiconductor heterojunctions can be understood as a relaxation process involving the low-temperature plastic deformation of the epilayer. A simple model for this deformation shows that the main features of these dislocation arrays at the heterojunction can be predicted. It is shown that the dissociated nature of the dislocations and their <span><math><mtext>α</mtext><mtext>β</mtext></math></span> character must both be taken into account. The type of dislocations involved in this relaxation process depends on whether the epilayer is initially in compression or tension.</p></div>","PeriodicalId":6969,"journal":{"name":"Acta Metallurgica","volume":"37 10","pages":"Pages 2765-2777"},"PeriodicalIF":0.0,"publicationDate":"1989-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0001-6160(89)90311-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72789652","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: 29
Structure-energy correlation for grain boundaries in f.c.c. metals—II. Boundaries on the (110) and (113) planes 氟化金属中晶界的结构-能量关联。(110)和(113)平面上的边界
Acta Metallurgica Pub Date : 1989-10-01 DOI: 10.1016/0001-6160(89)90317-9
D. Wolf
{"title":"Structure-energy correlation for grain boundaries in f.c.c. metals—II. Boundaries on the (110) and (113) planes","authors":"D. Wolf","doi":"10.1016/0001-6160(89)90317-9","DOIUrl":"https://doi.org/10.1016/0001-6160(89)90317-9","url":null,"abstract":"<div><p>The zero-temperature energies and equilibrium volume expansions of point-defect free grain boundaries (GBs) on the third and fourth densest planes of f.c.c. Cu have been determined using an Embedded-Atom-Method (EAM) and a Lennard-Jones (LJ) potential. It is found that the energies and volume expansions of the (110) and (113) boundaries are typically about 50% larger than for the (100) boundaries and about three to four times those of the (111) boundaries investigated earlier. This corelation between planar density, i.e. interplanar spacing, and GB energy as well as volume expansion is shown to be closely related to the structural disorder in the interface region. A practically linear relationship between GB energy and volume expansion is observed. Based on the special geometry and properties of the symmetrical tilt configuration on a given lattice plane (which is obtained for a twist angle of 180°), it is proposed to consider these planar defects as generalized (i.e. inverted) stacking faults rather than high-angle grain boundaries.</p></div>","PeriodicalId":6969,"journal":{"name":"Acta Metallurgica","volume":"37 10","pages":"Pages 2823-2833"},"PeriodicalIF":0.0,"publicationDate":"1989-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0001-6160(89)90317-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134657981","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: 0
Creep crack growth and cavitation damage in a 12% CrMoV steel 12% CrMoV钢蠕变裂纹扩展及空化损伤
Acta Metallurgica Pub Date : 1989-10-01 DOI: 10.1016/0001-6160(89)90307-6
C. Wiesner, J. Earthman, G. Eggeler, B. Ilschner
{"title":"Creep crack growth and cavitation damage in a 12% CrMoV steel","authors":"C. Wiesner, J. Earthman, G. Eggeler, B. Ilschner","doi":"10.1016/0001-6160(89)90307-6","DOIUrl":"https://doi.org/10.1016/0001-6160(89)90307-6","url":null,"abstract":"","PeriodicalId":6969,"journal":{"name":"Acta Metallurgica","volume":"10 1","pages":"2733-2741"},"PeriodicalIF":0.0,"publicationDate":"1989-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79944977","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: 14
The influence of solutes on flow stress plateaus, with emphasis on back stresses and the development of unified constitutive equations 溶质对流动应力高原的影响，重点是背应力和统一本构方程的发展
Acta Metallurgica Pub Date : 1989-10-01 DOI: 10.1016/0001-6160(89)90303-9
G.A. Henshall , A.K. Miller
{"title":"The influence of solutes on flow stress plateaus, with emphasis on back stresses and the development of unified constitutive equations","authors":"G.A. Henshall ,&nbsp;A.K. Miller","doi":"10.1016/0001-6160(89)90303-9","DOIUrl":"10.1016/0001-6160(89)90303-9","url":null,"abstract":"<div><p>To study the plateaus and peaks in the temperature dependence of the flow stress commonly observed in solid solution alloys, the flow stress of pure aluminum and three binary Al-Mg alloys has been measured at temperatures between 77 and 750 K and nonelastic strains between 0.02 and 20%. Both athermal and thermally activated processes were found to contribute to the observed behavior. Plateaus in the stress vs temperature response are largely due to the effects of solutes on the evolution of back stresses, an athermal process. Peaks in the stress-temperature response of the substitutional Al-Mg alloys are caused by the interaction of mobile solutes with dislocations, a thermally activated process which increases the effectiveness of the substructure as a barrier to dislocation motion. Based on these results. a physically plausible and simple method of incorporating solute strengthening within unified physical-phenomenological constitutive equations is outlined.</p></div>","PeriodicalId":6969,"journal":{"name":"Acta Metallurgica","volume":"37 10","pages":"Pages 2693-2704"},"PeriodicalIF":0.0,"publicationDate":"1989-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0001-6160(89)90303-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76694365","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: 22
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