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金属学报  1996, Vol. 32 Issue (3): 289-293    
  论文 本期目录 | 过刊浏览 |
预氧化对Ni_3Al合金中温塑性的影响
叶长江;李铁藩
中国科学院金属腐蚀与防护研究所腐蚀与防护国家重点实验室;暨南大学
EFFECT OF PREOXIDATION ON DUCTILITY OF Ni_3Al BASE ALLOYS AT ELEVATED TEMPERATURE
YE Changiiang; LI Tiefan(State Key Laboratory for Corrosion and Protection; Institute of Corrosion and Protection of Metals; Chinese Academy of Sciences; Shenyang 110015 )( Jinan University; Guangzhou 510632 )(Manuscript received 1 995-0 1-27; in revised form 1995-08-09)
引用本文:

叶长江;李铁藩. 预氧化对Ni_3Al合金中温塑性的影响[J]. 金属学报, 1996, 32(3): 289-293.
, . EFFECT OF PREOXIDATION ON DUCTILITY OF Ni_3Al BASE ALLOYS AT ELEVATED TEMPERATURE[J]. Acta Metall Sin, 1996, 32(3): 289-293.

全文: PDF(428 KB)  
摘要: 细晶Ni-11.82Al-1.3Zr-0.1B合金在空气中1000℃预氧化15min后,由于活性元素Zr的作用,氧化膜外层形成富Ni氧化膜,使空气环境下600℃的动态脆性加剧,真空下600℃拉伸时,预氧化处理后的细晶试样塑性仅略有降低.当预氧化环境由空气改为氩气气氛(pO2=l0-1Pa)时,Ni的氧化速率约降低三个数量级Al的氧化速率片数实际上与外部施加的氧分压无关,在氩气中二者的氧化速率接近,且Al203较NiO的标准生成自由能低,故在氩气环境下预氧化时形成富Al的氧化膜粗晶合金的动态脆化减弱,但在真空下600℃拉伸时,预氧化后的粗晶试样与未经预氧化处理的试样相比,其延伸率明显降低
关键词 预氧化富Ni氧化膜富Al氧化膜动态脆化    
Abstract:The fine-grained Ni-11 .82Al-1 .03Zr-0. 1B alloy formed Ni-rich oxide layer after preoxidized in air at 1000℃ for 15 min. This kind of preoxidation caused a severe embrittlement at 600℃ in air, and did not affect the ductility under vacuum. When the environment of preoxidation changed from air to argon atmosphere (po2 =10-1 Pa), the oxidation rate constant decreased by a factor of 103, but the oxidation rate constant for Al is expected to be independent of the externally applied oxygen partial pressure. Free energy of the formation for Al2O3 is more negative than that for NiO. The preoxidation at the argon atmosphere , by which Al-rich oxide layer formed on the large-grain specimens, retarded the embrittlement in air, but caused a ductility loss under vacuum. Correspondent: LI Tiefan, professor, Institute of Corrosion and Protection of Metals, Chinese Academy of Sciences, Shenyang 110015
Key words preoxidation    Ni-rich oxide layer    Al-rich oxide layer    dynamic embrittlement
收稿日期: 1996-03-18     
基金资助:国家863计划资助;;国家自然科学基金
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