新聞資訊
5A90鋁鋰合金超塑變形的不均勻性及其對(duì)空洞演化的影響
發(fā)布人：上海艾荔艾金屬材料有限公司bt990.com.cn
更新時(shí)間：2015-08-22
在475 ℃、初始應(yīng)變速率為3×10-4~1×10-3 s-1的變形條件下對(duì)5A90鋁鋰合金試樣進(jìn)行拉伸，研究合金超塑變形的應(yīng)變分布以及其對(duì)空洞演化的影響。
5A90鋁鋰合金超塑變形的不均勻性及其對(duì)空洞演化的影響Inhomogeneity of 5A90 Al-Li alloy during superplastic
deformation and its effect on evolution of cavity
在475 ℃、初始應(yīng)變速率為3×10-4~1×10-3
s-1的變形條件下對(duì)5A90鋁鋰合金試樣進(jìn)行拉伸，研究合金超塑變形的應(yīng)變分布以及其對(duì)空洞演化的影響。結(jié)果表明：合金超塑變形是不均勻的，應(yīng)變和空洞沿著拉伸方向呈梯度分布。應(yīng)變量、空洞的尺寸與體積分?jǐn)?shù)由肩部到斷口逐漸增大。在不同的應(yīng)變速率條件下，空洞的長(zhǎng)大機(jī)制不同。在較高的應(yīng)變速率(1×10-3
s-1)條件下，空洞以塑性控制長(zhǎng)大為主。降低應(yīng)變速率至8×10-4
s-1以下時(shí)，空洞以擴(kuò)散長(zhǎng)大機(jī)制為主。而在同一局部應(yīng)變區(qū)域，橫截面與縱截面空洞長(zhǎng)大機(jī)制也不同，橫截面空洞呈球狀，為擴(kuò)散控制的長(zhǎng)大機(jī)制；縱截面空洞呈不規(guī)則狀，且沿拉伸方向被拉長(zhǎng)，為塑性控制的長(zhǎng)大機(jī)制。
The local strain distribution during superplastic
deformation of 5A90 Al-Li alloy and its effect on the evolution of cavity were
studied through uniaxial tension at constant temperature of 475 ℃ and different
initial strain rates of 3×10-4-1×10-3 s-1. The
results demonstrate that the deformation of alloy is inhomogeneity, the strain
and cavity remains non-uniform throughout the gauge. The strain, cavity size and
volume fraction were found to increase from the shoulder section to the fracture
tip. The cavity growth is different under different initial strain rates. In the
case of high strain rate (1×10-3 s-1), the cavity growth
is controlled by plastic deformation, and reducing the strain rate to
8×10-4 s-1, the cavity growth is controlled by diffusional
process. And in the region with same local strain, the cavity growth mechanism
in longitudinal section is different from transverse section. The transverse
section with spherical is controlled by diffusional process cavity, while the
same longitudinal section with elongated cavity is controlled by plastic
deformation.
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