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Morphology and morphometry of two hybridizing buntings at their hybrid zone in northern Iran reveal intermediate and transgressive morphotypes

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Avian Research 2023年第4期14卷 523-532页

作者： Ali Gholamhosseini Mansour Aliabadian Till Topfer Glenn-Peter Sætre Ornithology Research Laboratory Department of BiologySchool of ScienceShiraz UniversityShirazIran Department of Biology Faculty of SciencesFerdowsi University of MashhadMashhadIran Leibniz Institute for the Analysis of Biodiversity Change Zoological Research Museum Alexander KoenigCentre for Taxonomy and MorphologyBonnGermany Centre for Ecological and Evolutionary Synthesis(CEES) Department of BiosciencesUniversity of OsloNorway

The closely related Black-headed Bunting(Emberiza melanocephala,a western Palearctic lineage)and Red-headed Bunting(Emberiza bruniceps,an eastern Palearctic lineage)hybridize and replace each other south of the Caspian *** parental species have distinct phenotypes and therefore morphology is useful for assessing hybridization in the contact *** the years of 1940 and 1977,quite a few hybrids were collected and studied *** then,the hybrid zone appears to have expanded westwards,but there has been a time gap in the collection of morphological *** we reanalyze bunting specimens morphologically and compare the historical data with recent *** and phenotypic traits from three time periods(1940,1977 and recent)were studied to assess phenotypic variation of hybrids,pattern of hybridization,and transgressive traits in the hybrid *** results show that most of the birds in the hybrid zone exhibit intermediate phenotypes(both colors and morphometric characters),ranging from the pure phenotype of either of the parental ***,hybridization has also produced novel phenotypes not seen in any of the *** a canonical discriminant function analysis,the morphometric characters separated each parental species and the hybrids quite *** results showed morphometric intermediacy of hybrids in accordance with *** observe a time trend in which recent hybrids are more similar to Red-headed Buntings phenotypically compared to historical *** pattern is likely a signature of a westward expansion of the Red-headed Bunting into the breeding range of the Black-headed Bunting.

关键词： Bunting Hybridization Intermediate phenotypes Transgressive traits

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New insights into microstructural changes during transient liquid phase bonding of GTD-111 superalloy

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Transactions of Nonferrous Metals Society of China 2021年第9期31卷 2703-2715页

作者： Javad ASADI Seyed Abdolkarim SAJJADI Hamid OMIDVAR Materials and Metallurgical Engineering Department Faculty of EngineeringFerdowsi University of MashhadMashhadIran Department of Materials and Metallurgical Engineering Amirkabir University of Technology(Tehran Polytechnic)TehranIran

The effects of joining temperature(TJ)and time(tJ)on microstructure of the transient liquid phase(TLP)bonding of GTD-111 superalloy were *** bonding process was applied using BNi-3 filler at temperatures of 1080,1120,and 1160℃ for isothermal solidification time of 195,135,and 90 min,*** heat treatment was also applied to all of the *** results show that intermetallic and eutectic compounds such as Ni-rich borides,Ni−B−Si ternary compound and eutectic-γcontinuously are formed in the joint region during *** increasing tJ,intermetallic phases are firstly reduced and eventually eliminated and isothermal solidification is completed as *** the increase of the holding time at all of the three bonding temperatures,the thickness of the athermally solidified zone(ASZ)and the volume fraction of precipitates in the bonding area decrease and the width of the diffusion affected zone(DAZ)*** results are also obtained by increasing TJ from 1080 to 1160℃ at tJ=90 ***,increasing the TJ from 1080 to 1160℃ leads to the faster elimination of intermetallic phases from the ***,these phases are again observed in the joint region at 1180℃.It is observed that by increasing the bonding temperature,the bonding width and the rate of dissolution of the base metal *** on these results,increasing the homogenization time from 180 to 300 min leads to the elimination of boride precipitates in the DAZ and a high uniformity of the concentration of alloying elements in the joint region and the base metal.

关键词： TLP bonding joint GTD-111 superalloy isothermal solidification microstructure homogenization

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Standard heat treatment effects on TLP bonded IN-738LC superalloy using BNi-9 filler:An approach to make an ideal joint

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Transactions of Nonferrous Metals Society of China 2022年第1期32卷 192-205页

作者： Danesh AMIRI Ata KAMYABI-GOL Seyed Abdolkarim SAJJADI Department of Materials Science and Engineering Engineering FacultyFerdowsi University of MashhadMashhadIran

The present research is focused on the effects of standard heat treatment on the microstructure and mechanical properties of diffusion brazed IN-738 LC *** distinct heat treatment cycles of full solution annealing,partial solution annealing,and aging treatment were applied to the bonded specimens,*** results reveal that bonding at 1120℃for 5 min leads to incomplete isothermal solidification and formation of eutectic phases including Ni-and Cr-rich borides in the joint *** the holding time to 45 min leads to the full isothermal solidification and formation of a nickel proeutectic solid-solution phase(γ)in the *** standard heat treatment of isothermally solidified and non-isothermally solidified specimens results in the complete elimination of the boride phases in the diffusion-affected zone and also the formation ofγ’precipitates in the isothermally solidified ***,discontinuously re-solidified products are observed in joint district in the non-isothermally solidified *** highest shear strength(~801 MPa)is achieved for isothermally solidified specimen after standard heat treatment;this strength is approximately 99%that of the substrate material.

关键词： IN738LC standard heat treatment diffusion brazing isothermal solidification γ’precipitates mechanical properties

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