镍锗尖晶石位错域的高温蠕变实验研究

doi:10.3321/j.issn:0001-5733.2001.05.013

CORC > 北京大学 > 地球与空间科学学院

	镍锗尖晶石位错域的高温蠕变实验研究; High-temperature dislocation creep in Ni2GeO4 spinel
	赵永红
刊名	地球物理学报
	2001
关键词	流变性镍锗尖晶石扩散蠕变实验研究 rheology germanate spinel dislocation creep experimental study
DOI	10.3321/j.issn:0001-5733.2001.05.013
英文摘要	利用人工合成的多晶材料研究了镍锗尖晶石在位错域的高温蠕变性质 .多晶材料的颗粒尺寸约 8μm .单轴压缩试件为圆柱状 ,使用气体介质围压筒 .常压蠕变试验过程中 ,围压为 3 0 0MPa ,温度为 1 3 73— 1 5 2 3K ,应力在 5 5— 3 3 0MPa范围内 .从实验结果得出了镍锗尖晶石在位错域的流动律 ,应力指数n =2 9± 0 1 ,表明流动的微观机制为位错蠕变 .与其他尖晶石进行对比可以发现一个力学同构群 ,虽然在正尖晶石和反尖晶石之间存在一定的差异 .在位错蠕变域 ,尖晶石与橄榄石归一化的强度类似 .由于尖晶石的剪切模量比橄榄石高5 0 % ,其实际强度也比橄榄...; Rheological property of upper mantle materials is a critical factor for us: to understand the geodynamic process of the earth. However, it is still very hard to perform the deformation experiment on earth material with high precision. Therefore the analogue material was used to model the deformation behavior of the earth material. In this study, high-temperature dislocation creep behavior in Ni2GeO4 spinel was investigated using synthetic polycrystalline aggregates with average grain-size about 8 micron. Cylindrical samples were deformed at constant load in a gas-medium apparatus at temperatures ranging from 1373 K to 1523 K and stresses ranging from 55 to 330 MPa. The deformation mechanism was identified, characterized by the flow law with the stress exponent: n = 2.9 +/- 0.1. The flow law suggests deformation by dislocation creep. A comparison with other spinels shows that an isomechanical group can be defined for spinels, although some differences between normal and inverse spinels can be identified. When creep data for olivine and spinel are normalized, their normalized strengths are comparable. The actural flow stress of spinel is higher than that of olivine because of higher shear modulus. Spinel (ringwoodite) has a similar strength to olivine in the dislocation creep regime. When extrapolated to Earth-like conditions, olivine ( n approximate to 3.5) may be stronger than spinel (n approximate to 3) due to it's higher stress exponent.; SCI(E); 中文核心期刊要目总览(PKU); 中国科学引文数据库(CSCD); 2; 05; 696-703; 44
语种	中文
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/86251]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	赵永红. 镍锗尖晶石位错域的高温蠕变实验研究, High-temperature dislocation creep in Ni2GeO4 spinel[J]. 地球物理学报,2001.
APA	赵永红.(2001).镍锗尖晶石位错域的高温蠕变实验研究.地球物理学报.
MLA	赵永红."镍锗尖晶石位错域的高温蠕变实验研究".地球物理学报 (2001).