最新色国产精品精品视频,中文字幕日韩一区二区不卡,亚洲有码转帖,夜夜躁日日躁狠狠久久av,中国凸偷窥xxxx自由视频

Copper-mold suction casting was employed for the Cu40Zr44Ti8Al8 bulk metallic glasses (BMGs) preparation. X-ray diffraction (XRD) and differential scanning calorimetry (DSC) were used to analyze the microstructure evlution and crystallization kinetics of the samples. Results show that Al3Zr and Cu10Zr7 precipetate from the amorphous matrix successively. The activation enevey of the first crystallization peak calcultaiton by the Kissinger and Ozawa method are 315.69 kJ/mol and 312.65 kJ/mol, so the BMGs are highly thermal stable. Crystallization process of the BMGs shows obvious kinetic effect. The dependence of the characteristic temperatures on the heating rate follows Lasocka equation. But crystallization mechanism of the BMGs hardly shows any kinetic effect and has nothing to do with heating rate. Parameters fitted by the GM medol under the heating rate of 30 K/min change form λi=5.2,n=3.4 to λi=2.5,n=4, indicating that the BMGs experienced an increasing nucleation and growth rates in the primary crystallization process.