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2024變形鋁合金半固態(tài)漿料在連續(xù)冷卻和保溫過程中的組織演變
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更新時間：2015-08-25
采用液淬法研究2024變形鋁合金半固態(tài)漿料在連續(xù)冷卻和不同溫度保溫過程中的組織演變。
2024變形鋁合金半固態(tài)漿料在連續(xù)冷卻和保溫過程中的組織演變Microstructure evolutions of semisolid slurry of 2024
wrought aluminum alloy during continuous cooling and isothermal holding
采用液淬法研究2024變形鋁合金半固態(tài)漿料在連續(xù)冷卻和不同溫度保溫過程中的組織演變。結(jié)果表明：在連續(xù)冷卻過程中，漿料固相率、初生固相顆粒尺寸及形狀因子均隨溫度降低而連續(xù)增大；不同溫度保溫時，漿料固相率在對應(yīng)值作微小波動，初生固相顆粒尺寸連續(xù)增大，形狀因子先減小后增大，最后減小到1.3~1.4之間。連續(xù)冷卻前期漿料固相率的增加主要受固相顆粒的析出控制，而后期主要由固相顆粒的長大控制。保溫過程中漿料組織演變可分為聚集組織分解、顆粒合并粗化和顆粒熟化3個階段，初生固相顆粒的長大規(guī)律符合動力學(xué)方程
。
The microstructure evolutions of 2024 wrought aluminum
alloy slurry during continuous cooling and isothermal holding were investigated
by a simple technique of water quenching. The results show that during the
continuous cooling course, the solid fraction, average particle size and shape
factor increase continuously with temperature decreasing. While during the
isothermal holding stage, the solid fraction of the slurry fluctuates at the
corresponding values, the particle size of the primary solid phase increases
continuously, and the shape factor decreases firstly, then increases and finally
decreases to a value between 1.3 and 1.4. The increase of solid fraction during
continuous cooling is dominated mainly by the precipitation of solid-phase
particles in the early stage, and by the growth of solid-phase particles at
last. The evolution process of isothermal holding can be divided into three
steps: disaggregation of the chain structure, mergence and coarsening, and the
final ripening of primary particles. These primary solid particles grow by
obeying the kinetic law in the whole isothermal holding process.
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