采用电子探针、二次离子质谱、无汞真空套管测氢仪等检测手段,并配合金相分析及试样孔隙度的测定,鉴定出含稀土的Al-Si合金中有稀土氢化物的存在,确认在多元稀土金属间化合物中氢的富集,提出稀土具有较强固氢作用的观点。对加稀土前后Al-Si合金中各形态氢的相对含量变化作了定性分析,对稀土净化Al合金的原因进行了探讨,指出固氢是降低游离氢含量、减少氢致缺陷的重要原因。
Occurrence of RE hydride was identified in the Al-Si alloy containing RE andenrichment of hydrogen in polynary RE intermetallic compound was determined by means ofEPMA, secondary ion mass spectrography, Hg-free vacuum drivepipe hydrogen-meter to-gether with metallography and porosity measurement. The relative contents of various formsof hydrogen before and after RE added in Al-Si alloy have been qualitatively analysed. Aconcept about firm fixation of hydrogen by RE was suggested. It is believed that the hydrogenfixation is the major cause of reducing free hydrogen content and decreasing hydrogen-in-duced defects.
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