PA N JinChangsha Institute of Technology
,
ChinaLI Jihong
,
NING Xiaoguang
,
YE HengqiangLab. of Atomic Imaging of Solids
,
Institute of Metal Research
,
Chinese Academy of Sciences. Shenyang
,
China Manuscript received 28 February
,
1994
金属学报(英文版)
A newly developed whisker K_(2)O 6TiO_(2) reinforced 6061 Al composite was prepared by squeeze casting process. The flexural strength of the composite is 518MPa, and decreases to 490 M Pa after T6 treatment.The hardness of the composite also shows the similar change while T6 treating. The results of HRTEMobservation may explaine this property change. It was considered that there is a continuous TiO layer at the whisker-matrix interface, which is easily to react with the segregated Mg and to form MgTi_(2)O_(4), MgAl_(2)O_(4). The thickening of TiO layer after T6 treatment is the main reason resulting in strength degradation of composite.
关键词:
potassium titanate. whisker
,
null
,
null
MA Zhongyi
,
LU Yuxiong
,
BI JingInstitute of Metal Research
,
Chinese Academy of Sciences. Shenyang
,
ChinaZHANG YuzhengNortheastern University
,
Shenyang. China Manuscript received 16 May
,
1994
金属学报(英文版)
The tensile tests on the silicon carbide whisker and paniculate reinforced 2124A1 and 2024Al alloy composites fabricated by P/ M technique were carried out at the temperatures ranging from room temperature to - 196C . and the fracture surfaces were examined. The cryogenic strength of the composites increases with the decreasing test temperature. Clean interface is beneficial to the improvement in cryogenic strength of the composites. The effect of the interface characteristics on the paniculate composite is less than that on the whisker composite. With the decreasing temperature, the increase in strength of the whisker composite is more than that of the paniculate composite, which could be attributed to different strengthening mechanism.
关键词:
composite
,
null
,
null
,
null
