摘要
利用原位XRD及Rietveld法对Ti-Mo合金fccδ相氢化物在293—1173 K脱氢过程中的晶格参数、晶粒尺寸及微观应变进行了分析．在退火过程中,δ相逐渐脱氢转变为bccβ相固溶体．两相晶格参数的变化大体随Mo含量的增加和温度的升高而缩小,且β相的变化率大于δ相的变化率．两相的晶粒尺寸和微观应变在温度升高时都显示了先变大再变小的趋势．从微观结构对上述现象进行了解释和讨论．
The in situ XRD and Rietveld refinement have been used to study the dehydrogenation of fcc δ phase hydrides of Ti-Mo alloys in the temperature range of 293 to 1173 K, including lattice parameters, crystallite sizes and mirostrains. During annealing, δ phase transformed to bcc β phase solid solution. Lattice parameters of the δ andβ phases decrease with increasing Mo content and rising temperatures, and the changes of parameter ofβ phase are greater than that of the δ phase. With increasing temperatures, the crystallite sizes and microstrains of the two phases both show a trend of a small-large-small sequence. The observed phenomena have been explained and discussed based on the influences of micro defects, misfit of lattices and thermal expansions etc.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2006年第8期850-856,共7页
Acta Metallurgica Sinica
基金
国家自然科学基金50371086
