{"title":"Stacking faults in fatigued titanium single crystals","authors":"Tan Xiao-Li, Gu Hai-Cheng","doi":"10.1016/0956-716X(95)00422-R","DOIUrl":"10.1016/0956-716X(95)00422-R","url":null,"abstract":"","PeriodicalId":101150,"journal":{"name":"Scripta Metallurgica et Materialia","volume":"33 12","pages":"Pages 1977-1980"},"PeriodicalIF":0.0,"publicationDate":"1995-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0956-716X(95)00422-R","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83029927","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}
{"title":"Electromigration activation energy in pure aluminum films deposited by partially ionized beam technique","authors":"O.V. Kononenko, E.D. Ivanov, V.N. Matveev, I.I. Khodos","doi":"10.1016/0956-716X(95)00450-A","DOIUrl":"10.1016/0956-716X(95)00450-A","url":null,"abstract":"","PeriodicalId":101150,"journal":{"name":"Scripta Metallurgica et Materialia","volume":"33 12","pages":"Pages 1981-1986"},"PeriodicalIF":0.0,"publicationDate":"1995-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0956-716X(95)00450-A","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74750406","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}
{"title":"On the mechanism of ± 13 〈211〉 dipole formation in TiAl","authors":"B.J. Inkson","doi":"10.1016/0956-716X(95)00440-7","DOIUrl":"10.1016/0956-716X(95)00440-7","url":null,"abstract":"<div><p><span><math><mtext>〈</mtext><mtext>1</mtext><mtext>01〉></mtext></math></span> superdislocations in TiAl can dissociate on discrete segments of the dislocation line and generate trailing <span><math><mtext>± </mtext><mtext>1</mtext><mtext>6</mtext><mtext> 〈</mtext><mtext>11</mtext><mtext>2〉</mtext></math></span> or <span><math><mtext>± </mtext><mtext>1</mtext><mtext>3</mtext><mtext> 〈</mtext><mtext>2</mtext><mtext>11〉</mtext></math></span> dipoles. A mechanism for <span><math><mtext>± </mtext><mtext>1</mtext><mtext>3</mtext><mtext> 〈</mtext><mtext>2</mtext><mtext>11〉</mtext></math></span> dipole formation from a <span><math><mtext>〈</mtext><mtext>1</mtext><mtext>01〉</mtext></math></span> superdislocation dissociated on two adjacent (111) planes is discussed. The non-coplanar <span><math><mtext>〈</mtext><mtext>1</mtext><mtext>01〉</mtext></math></span> core structure may arise either from direct dissociation by the cross-slip of a <span><math><mtext>1</mtext><mtext>2</mtext><mtext> 〈</mtext><mtext>1</mtext><mtext>01〉</mtext></math></span> superpartial, or by an initial <span><math><mtext>〈</mtext><mtext>1</mtext><mtext>01〉 → </mtext><mtext>1</mtext><mtext>2</mtext><mtext> 〈</mtext><mtext>1</mtext><mtext>10〉 + </mtext><mtext>1</mtext><mtext>2</mtext><mtext> 〈</mtext><mtext>11</mtext><mtext>2〉</mtext></math></span> decomposition of the superdislocation and the subsequent pinning of the <span><math><mtext>1</mtext><mtext>2</mtext><mtext> 〈</mtext><mtext>1</mtext><mtext>10〉</mtext></math></span> perfect dislocation by an immobile <span><math><mtext>1</mtext><mtext>6</mtext><mtext> 〈</mtext><mtext>11</mtext><mtext>2〉</mtext></math></span> delocalised partial associated with a non-coplanar <span><math><mtext>1</mtext><mtext>2</mtext><mtext> 〈</mtext><mtext>11</mtext><mtext>2〉</mtext></math></span> superdislocation core.</p></div>","PeriodicalId":101150,"journal":{"name":"Scripta Metallurgica et Materialia","volume":"33 12","pages":"Pages 1929-1932"},"PeriodicalIF":0.0,"publicationDate":"1995-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0956-716X(95)00440-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81176540","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}
{"title":"Time-resolved SR study on evolution of dislocation structures in polycrystalline copper under uniaxial loading","authors":"C.H. Chang , Y.M. Koo , B.P. Tolochko","doi":"10.1016/0956-716X(95)00445-2","DOIUrl":"10.1016/0956-716X(95)00445-2","url":null,"abstract":"","PeriodicalId":101150,"journal":{"name":"Scripta Metallurgica et Materialia","volume":"33 12","pages":"Pages 1955-1960"},"PeriodicalIF":0.0,"publicationDate":"1995-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0956-716X(95)00445-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74967934","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}
{"title":"Author index of volume 33ager, Jr., and C.F. Windisch, Jr., Mater. Sci. and Eng., in press.","authors":"","doi":"10.1016/0956-716X(95)90034-H","DOIUrl":"https://doi.org/10.1016/0956-716X(95)90034-H","url":null,"abstract":"","PeriodicalId":101150,"journal":{"name":"Scripta Metallurgica et Materialia","volume":"33 12","pages":"Pages 2075-2082"},"PeriodicalIF":0.0,"publicationDate":"1995-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0956-716X(95)90034-H","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"137351324","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}
S.A. Oliver, R.J. Willey, H.H. Hamdeh, G. Oliveri, G. Busca
{"title":"Structure and magnetic properties of magnesium ferrite fine powders","authors":"S.A. Oliver, R.J. Willey, H.H. Hamdeh, G. Oliveri, G. Busca","doi":"10.1016/0956-716X(95)00412-O","DOIUrl":"10.1016/0956-716X(95)00412-O","url":null,"abstract":"<div><p>Fine powders of magnesium ferrite, MgFe<sub>2</sub>O<sub>4</sub>, were produced through the sol-gel supercritical drying method, with two portions then being calcined at 773 K and 1073 K. The powder structural and magnetic properties were determined from transmission electron microscope micrographs, x-ray diffraction, Mössbauer effect spectroscopy and magnetometry measurements. The powder structure matched the MgFe<sub>2</sub>O<sub>4</sub> spinel phase, with small amounts of α-Fe<sub>2</sub>O<sub>3</sub> being observed in heated samples. As-produced powders were superparamagnetic at room temperature, with single magnetic domain particle behavior being observed at low temperatures, and for the 1073 K heated sample. The particle size distribution for the as-produced powder was evaluated separately from the micrographs, by fitting the magnetization data to a weighted Langevin function, and by fitting Mössbauer spectra taken at temperatures from 25 K to 298 K. Very similar particle size distributions were found from all three methods. The average particle diameter was 11 nm for the as-produced powder, and increased for heated samples. The saturation magnetization and magnetocrystalline anisotropy energy density values were both consistent with bulk values, in contrast to the large differences between particle and bulk values described for other fine particle systems.</p></div>","PeriodicalId":101150,"journal":{"name":"Scripta Metallurgica et Materialia","volume":"33 10","pages":"Pages 1695-1701"},"PeriodicalIF":0.0,"publicationDate":"1995-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0956-716X(95)00412-O","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83246382","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}
{"title":"Soft magnetic nanocrystalline materials","authors":"Giselher Herzer","doi":"10.1016/0956-716X(95)00397-E","DOIUrl":"10.1016/0956-716X(95)00397-E","url":null,"abstract":"<div><p>The microstructure property relationship in soft magnetic nanocrystalline Fe-base materials is surveyed: The basic mechanism is that the magneto-crystalline anisotropy of the small, randomly oriented bcc-Fe grains is averaged out by exchange interaction. The resulting magnetic behaviour can be well described with the random anisotropy model. The latter has been extended to multiphase materials including the case that the grain size exceeds the exchange length and, is able now to describe the hardening mechanism in the overannealed nanocrystalline state due to the precipitation of borides. Further, the crucial role of the coupling mechanism between the grains is discussed. Thus, as a function of temperature, a single sample combines a variety of phenomena ranging from soft, over hard to finally superparamagnetic behaviour. Finally it is shown, how the structural phases present lead to low or vanishing magnetostriction; the random anisotropy effect guarantees an essentially isotropic behaviour comparable to the amorphous case. Together with the suppressed magneto-crystalline anisotropy, the low magnetostriction provides the basis for the superior soft magnetic properties observed in particular compositions.</p></div>","PeriodicalId":101150,"journal":{"name":"Scripta Metallurgica et Materialia","volume":"33 10","pages":"Pages 1741-1756"},"PeriodicalIF":0.0,"publicationDate":"1995-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0956-716X(95)00397-E","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87533978","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}
{"title":"Ferromagnetic grain boundary signature in die-upset Re-Fe-B magnets","authors":"L.Henderson Lewis, Yimei Zhu, D.O. Welch","doi":"10.1016/0956-716X(95)00410-W","DOIUrl":"10.1016/0956-716X(95)00410-W","url":null,"abstract":"<div><p>Previous nanostructural and nanocompositional studies performed on the boundaries of deformed grains in two die-upset rare earth magnets with bulk compositions Nd<sub>13.75</sub>Fe<sub>80.25</sub>B<sub>6</sub> and Pr<sub>13.75</sub>Fe<sub>80.25</sub>B<sub>6</sub> indicate that the intergranular phase in many grain boundaries is enriched in iron relative to the bulk. We present here preliminary magnetic data that provide further evidence that this grain boundary phase is indeed iron-rich, and in fact appears to be ferromagnetic. Hysteresis loops were performed at 800 K on die-upset magnets with the above compositions. Each sample showed a clear hysteresis with coercivities between 34 and 40 Oe and an average remanence 4πB<sub>R</sub> of 6.8 G for the Nd-based sample and 10.3 G for the Pr-based sample. The ferromagnetic signals measured at high temperature in these magnets are attributed to the iron-rich grain boundary phase. The implications of this conclusion with respect to coercivity are discussed.</p></div>","PeriodicalId":101150,"journal":{"name":"Scripta Metallurgica et Materialia","volume":"33 10","pages":"Pages 1775-1780"},"PeriodicalIF":0.0,"publicationDate":"1995-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0956-716X(95)00410-W","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87852877","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}