Friend Links



Your Current Location : Home news
Microstructure and Thermal Stability of Rapidly Solidified Hypereutectic Al-Si Alloy

Source: Time:2015-05-15 17:09:42 frequency:

A report, published in the journal The Chinese Journal of Nonferrous Metals,wrote:
A report, published in the journal The Chinese Journal of Nonferrous Metals,wrote:

The microstructure characteristics of rapidly solidified hypereutectic Al-Si alloy were analyzed as function of annealing temperature and holding time by scanning electron microscopy (SEM), differential scanning calorimetry (DSC) and X-ray diffractometry (XRD). 

The precipitation and coarsening of supersaturated Si element were also investigated. The results indicate that the microstructure of rapidly solidified Al-Si alloy is composed of fine block-like primary and needle-like eutectic Si phase dispersed homogeneously in the α(Al) matrix. The structural distortion of the α(Al) matrix is observed owing to large solidification rate as a result of gas atomization. While, the structural distortion is released after annealing. The studies of coarsening of supersaturated Si in the matrix suggest that the precipitated Si phase coarsens with increasing annealing temperature or prolonging holding time. 

However, the coarsening behavior is different to the classical LSW theory. The coarsening mechanism is more likely to be controlled by interface diffusion with coarsening exponent. Additionally, the annealing temperature only affects the coarsening rate constant and activation energy, but less affects the coarsening exponent.

Home   |  About us   |  news   |  Products   |  Honor   |  Factory   |  Market   |  Feedback   |  Contact   | 

Cored Wire

all right reserved © 2013 Anyang Tiefa Metallurgy Co., Ltd
Add:Longquan Development area , Long'an District, Anyang, Henan, China
Tel Phone:86-372-5055522      Fax:86-372-5055500

National ministry of industry and information website Record
Numbers   Henan ICP Record  ...... No
Technical support:Star source network