Tan Zhao
,
Dong Wang
,
Jian Zhang
,
Guang Chen
,
Langhong Lou
材料科学技术（英文）
The precipitates at grain boundary in a directionally solidified Ni base superalloy after heat treatment, aging at 975°C, and creep rupture test have been characterized. Besides the primary MC carbides and fine particles of μ phase, the Re-containing M23C6 was observed. The precipitation kinetics revealed that the formation of M23C6 was associated with the dissolution of μ phase and MC carbides. TEM image shows that the continuous precipitation of M23C6 particles effectively hinders the dislocation movement and strengthens the grain boundaries. The high strength of the alloy suggests that M23C6 carbides are beneficial to the properties although Re as an important matrix strengthening element was consumed.
关键词:
Ni-base Superalloys
,
null
,
null
,
null
汪文云
,
张朝晖
黄金
doi:10.3969/j.issn.1001-1277.2008.06.003
通过对贵州水银洞卡林型金矿苔藓植物野外全面调查,发现贵州水银洞金矿共有苔藓植物15科42属102种,其中苔类植物4科4属5种,藓类植物10科37属96种,角苔类植物1科1属1种. 短柄小曲尾藓Dicranella gonoi Card.、纤毛丝瓜藓Pohlia hisaet. Kop et J.S.Lou、纤枝短月藓Brachymenium exile (Doz.et.Molk) Bosch et Lac.、真藓Bryum argenteum Hedw.为该矿区裸地大量生长的种类,可利用它们作为金属矿山生态恢复进一步研究的素材.通过与露天开采的金矿区苔藓植物丰富度比较,埋藏型金矿区的苔藓植物较露天开采的金矿区的丰富.该区苔藓植物区系地理成分共9种,世界广布和中国特有分布占主要优势(各22种,都占21.57%),其次是东亚成分(共17种,都占16.67%),再次为热带亚洲成分(共16种,都占15.69%).
关键词:
苔藓植物
,
丰富度指数
,
区系
,
水银洞卡林型金矿
