MICROSTRUCTURAL EXAMINATION OF A SUPERPLASTIC YTTRIA-STABILIZED ZIRCONIA - IMPLICATIONS FOR THE SUPERPLASTICITY MECHANISM

被引:73
作者
PRIMDAHL, S
THOLEN, A
LANGDON, TG
机构
[1] TECH UNIV DENMARK, DEPT PHYS, DK-2800 LYNGBY, DENMARK
[2] UNIV SO CALIF, DEPT MAT SCI, LOS ANGELES, CA 90089 USA
[3] UNIV SO CALIF, DEPT MECH ENGN, LOS ANGELES, CA 90089 USA
来源
ACTA METALLURGICA ET MATERIALIA | 1995年 / 43卷 / 03期
基金
美国能源部;
关键词
D O I
10.1016/0956-7151(94)00307-4
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
A detailed microstructural examination was conducted on specimens of high purity superplastically-deformed 3Y-TZP (tetragonal ZrO2 stabilized with similar to 3 mol.% Y2O3). Several of the microstructural features were similar to conventional superplastic metallic alloys including the retention of an equiaxed grain configuration, evidence for only limited dislocation activity within the grains and the concurrent development of internal cavitation. There was no detectable amorphous phase at any of the grain boundaries or at the triple junctions but there was some segregation of yttria to the boundary regions. It is concluded that there are two types of superplastic Y-TZP materials depending upon whether there is an amorphous phase at the grain boundaries. When an amorphous phase is absent, the behavior is fairly similar to superplastic metals except that an additional mechanism operates at the lower stress levels to impede grain boundary sliding.
引用
收藏
页码:1211 / 1218
页数:8
相关论文
共 42 条
  • [1] [Anonymous], JPN J APPL PHYS, V57
  • [2] BLANDIN JJ, 1990, STRUCTURAL CERAMICS, P199
  • [3] BRAVOLEON A, 1993, 3RD EUROCERAMICS, V3, P877
  • [4] CARRY C, 1990, MATER RES SOC SYMP P, V196, P313, DOI 10.1557/PROC-196-313
  • [5] CARRY C, 1989, P MATERIALS RES SOC, V7, P199
  • [6] EFFECT OF IMPURITY CONTENT ON SUPERPLASTIC FLOW IN THE ZN-22-PERCENT AL-ALLOY
    CHAUDHURY, PK
    MOHAMED, FA
    [J]. ACTA METALLURGICA, 1988, 36 (04): : 1099 - 1110
  • [7] DEVELOPMENT OF SUPERPLASTIC STRUCTURAL CERAMICS
    CHEN, IW
    XUE, LA
    [J]. JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 1990, 73 (09) : 2585 - 2609
  • [8] SUPERPLASTICITY IN FINE-GRAINED CERAMICS AND CERAMIC COMPOSITES - CURRENT UNDERSTANDING AND FUTURE-PROSPECTS
    CHOKSHI, AH
    [J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 1993, 166 (1-2): : 119 - 133
  • [9] SUPERPLASTICITY IN ADVANCED MATERIALS
    CHOKSHI, AH
    MUKHERJEE, AK
    LANGDON, TG
    [J]. MATERIALS SCIENCE & ENGINEERING R-REPORTS, 1993, 10 (06) : 237 - 274
  • [10] THE NUCLEATION AND GROWTH OF CAVITIES IN A SUPERPLASTIC QUASI-SINGLE PHASE COPPER ALLOY
    CHOKSHI, AH
    LANGDON, TG
    [J]. ACTA METALLURGICA ET MATERIALIA, 1990, 38 (05): : 867 - 877