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首页> 外文期刊>Journal of Materials Research >Microstructural changes in grain interior and grain boundary by formation of metastable and stable phases related to age-hardening in an Au-Cu-Ag-Pd alloy
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Microstructural changes in grain interior and grain boundary by formation of metastable and stable phases related to age-hardening in an Au-Cu-Ag-Pd alloy

机译：与Au-Cu-Ag-Pd合金的时效硬化有关的亚稳态和稳定相的形成，使晶粒内部和晶界的显微组织变化

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摘要

The hardness changes caused by formation of the metastable and stable phases were examined and correlated with the microstructural changes in grain interior and grain boundary during aging at 350 ℃ to clarify the age-hardening and softening mechanism of a low-gold Au-Cu-Ag-Pd dental alloy. Aging in this context refers to the time-delay that occurs wherein such alloys are kept at elevated temperatures for periods upto many hours to allow precipitation or ordering to take place. During the period of increasing hardness, the matrix was separated into the Ag-rich α_1 and AuCu I phases through the metastable phases, forming block-like structure. The apparent hardening was attributed primarily to lattice strain due to the tetragonality of AuCu I' [the primer (') here indicates a metastable phase; likewise (I) and (I') indicate stable AuCu I and metastable AuCu I' phases, respectively] and AuCu I phases along the c-axis, secondarily to the coherency or semicoherency strain between the metastable α_1' and AuCu I' phases and between the α_0 and AuCu I phases along the α-axis. The apparent softening was caused primarily by growth and coarsening of the lamellar structure in the grain boundaries, secondarily by coarsening of the block-like structure in the grain interior.
机译：研究了由亚稳相和稳定相的形成引起的硬度变化，并将其与350℃时效时晶粒内部和晶界的微观结构变化相关，以阐明低金Au-Cu-Ag的时效硬化和软化机理。 -Pd牙科合金。在此上下文中的时效是指发生的时延，其中这种合金在高温下保持长达数小时的时间以允许析出或有序发生。在增加硬度的过程中，基体通过亚稳相分离为富Ag的α_1相和AuCu I相，形成块状结构。表观硬化主要归因于AuCu I'的四方性引起的晶格应变[这里的引物（'）表示亚稳相；同样（I）和（I'）分别表示沿c轴的稳定AuCu I和亚稳AuCu I'相]和AuCu I相，其次是亚稳态α_1'和AuCu I'相之间的相干或半相干应变，沿α轴位于α_0和AuCu I相之间。明显的软化主要是由于晶界中层状结构的生长和粗化，其次是由于晶粒内部的块状结构的粗化。

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  • 来源
    《Journal of Materials Research》 |2013年第9期|1211-1217|共7页
  • 作者

    Su-Yoen Cho; Gwang-Young Lee; Ji-In Jeong; Yong Hoon Kwon; Hyung-Il Kim; Hyo-Joung Seol;

  • 作者单位

    Department of Dental Materials, School of Dentistry and Medical Research Institute. Pusan National University,Beomeo-Ri, Mulgeum-Eup, Yangsan-Si, Gyeongsangnam-Do, 626-814, South Korea;

    Department of Dental Materials, School of Dentistry and Medical Research Institute. Pusan National University,Beomeo-Ri, Mulgeum-Eup, Yangsan-Si, Gyeongsangnam-Do, 626-814, South Korea;

    Department of Dental Materials, School of Dentistry and Medical Research Institute. Pusan National University,Beomeo-Ri, Mulgeum-Eup, Yangsan-Si, Gyeongsangnam-Do, 626-814, South Korea;

    Department of Dental Materials, School of Dentistry and Medical Research Institute. Pusan National University,Beomeo-Ri, Mulgeum-Eup, Yangsan-Si, Gyeongsangnam-Do, 626-814, South Korea;

    Department of Dental Materials, School of Dentistry and Medical Research Institute. Pusan National University,Beomeo-Ri, Mulgeum-Eup, Yangsan-Si, Gyeongsangnam-Do, 626-814, South Korea;

    Department of Dental Materials, School of Dentistry and Medical Research Institute. Pusan National University,Beomeo-Ri, Mulgeum-Eup, Yangsan-Si, Gyeongsangnam-Do, 626-814, South Korea;

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