Isothermal and athermal martensitic transformations in a zirconia–yttria alloy
Isothermal and athermal martensitic transformations in a zirconia–yttria alloy
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氧化锆-氧化钇合金中的等温和非热马氏体转变
DOI：
10.1016/s0921-5093(99)00373-1
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发表时间：
1999
期刊：
影响因子：
6.4
通讯作者：
T. Onda
中科院分区：
文献类型：
--
作者：
M. Hayakawa;K. Nishio;J. Hamakita;T. Onda
测量了块体样品的四方相变到单斜相(t-m)的马氏体相变开始温度(Ms)随Y2O组分的变化。当Y2O3量达到1.75mol.%时，随着Y2O3量的增加，相变几乎呈线性下降，但当Y2O3量超过2.0mol.%时，相变突然停止。MS有被快速降温抑制的趋势。事实上，对于Y_2O_3含量为1.6mol.%的小样品，水淬法完全抑制了相变。用这种方法制备的高度不稳定的四方相样品在高温下既有等温转变，又有在零度以下冷却到液氮温度时的非热转变。得到了等温转变的C曲线和非热转变的温度。
The Ms(martensite start temperature) of the tetragonal to monoclinic (t–m) transformation in the ZrO2–Y2O3system has been measured for bulk specimens as a function of Y2O3composition. It decreased nearly linearly with increasing Y2O3content up to 1.75 mol.%, but the transformation suddenly ceased to exist beyond 2.0 mol.% of Y2O3. The Msshowed a tendency to be suppressed by rapid cooling. In fact with a small specimen containing 1.6 mol.% of Y2O3, the transformation was completely suppressed by water quenching. The highly unstable tetragonal specimen prepared by such a method was found to exhibit both an isothermal transformation at elevated temperature and an athermal transformation during subzero cooling to liquid nitrogen temperature. The C-curve for the isothermal transformation and the Mstemperature for athermal transformations were obtained.