陈淼
,
陆光达
,
张桂凯
,
张延志
,
王小英
,
任大鹏
金属学报
doi:10.3321/j.issn:0412-1961.2009.10.021
为了解Pd及其合金贮氚(T)老化后,~3He在材料中的存在形式及分布状态,利用XRD与TEM分别分析了贮T老化1.6和3.5 a的Pd粉,以及贮T老化41和295 d的Pd_91.31Y_8.50Ru_0.19合金膜的结构变化.结果表明:T老化使得Pd粉的XRD峰变宽且峰强降低,品格发生畸变,同时,衍射峰略向低角度偏移,品格发生膨胀,1.6和3.5 a老化后,晶格常数分别增加0.095%和0.11%;在老化41 d的Pd_91.31Y_8.50Ru_0.19合金膜中,观察到分布均匀,直径约为1 nm的He泡,同时存在高密度的位错及位错环,在老化295 d的样品中,He泡直径略微增加,达1.2-1.4 nm,且分布均匀,位错及位错环密度降低.
关键词:
Pd
,
Pd_91.31Y_8.50Ru_0.19
,
氚老化
,
~3He
,
He泡
ZHANG Lei WANG Peixuan TAO Rong MA Ruzhang ZHANG Guoguang University of Science and Technology Beijing
,
Beijing
,
China professor
,
Department of Materials Physics.University of Science and Technology Beijing.Beijing 100083
,
China
金属学报(英文版)
Nucleation and growth of He bubbles at different annealing temperatures T≤1023 K in stain- less steels HR-2 and SS321,implanted with He~+(40-70 keV.1×10~(16)-6× 10~(17) He~+/cm~2),were ohserved under TEM.T=0.45T_m seems to be a transition temperature.The He bubbles continue mainly their nucleation at 0.3T_m< T<0.45T_m,and grow predominantly at T≥0.45T_m,due probably to migration and coalescence by surface diffusion of metal atoms around the bubbles.The apparent activation energies for the growth are found to he 0.41 and 0.31 eV for HR-2 and SS321 respectively.The bubble density in HR-2 is greater than that in SS321 within whole measuring temperature range,and the onset temperature of rapid swelling is also higher.It is believed that the resistance of HR-2 to He is superior to that fo SS321.
关键词:
stainless steel
,
null
,
null
,
null
,
null
