Zr對(duì)擠壓鑄造Al-5.0Cu-0.4Mn合金顯微組織和力學(xué)性能的影響
發(fā)布人：上海艾荔艾合金股份有限公司www.shailiai.cn
更新時(shí)間：2016-01-29
采用拉伸力學(xué)性能測(cè)試、宏觀腐蝕、掃描電鏡(SEM)、透射電鏡(TEM)等，研究不同Zr含量對(duì)擠壓鑄造Al-5.0Cu-0.4Mn合金顯微組織和力學(xué)性能的影響，并與重力鑄造的合金的顯微組織和力學(xué)性能進(jìn)行對(duì)比分析。
Zr對(duì)擠壓鑄造Al-5.0Cu-0.4Mn合金顯微組織和力學(xué)性能的影響Effect of Zr on microstructures and mechanical properties of squeeze cast Al-5.0Cu-0.4Mn alloy采用拉伸力學(xué)性能測(cè)試、宏觀腐蝕、掃描電鏡(SEM)、透射電鏡(TEM)等，研究不同Zr含量對(duì)擠壓鑄造Al-5.0Cu-0.4Mn合金顯微組織和力學(xué)性能的影響，并與重力鑄造的合金的顯微組織和力學(xué)性能進(jìn)行對(duì)比分析。結(jié)果表明：針對(duì)鑄態(tài)合金，無(wú)論是擠壓鑄造還是重力鑄造，在Zr含量(質(zhì)量分?jǐn)?shù))為0.25%時(shí)，合金獲得最佳的抗拉強(qiáng)度、屈服強(qiáng)度和伸長(zhǎng)率；而對(duì)于熱處理態(tài)合金，當(dāng)Zr含量從0增加到0.35%時(shí)，合金的抗拉強(qiáng)度和屈服強(qiáng)度都隨著Zr含量的增加而增加，但伸長(zhǎng)率在Zr含量為0.15%時(shí)達(dá)到最大值。擠壓鑄造可以顯著改善不同Zr含量合金的伸長(zhǎng)率，但對(duì)鑄態(tài)合金伸長(zhǎng)率的提升幅度明顯優(yōu)于熱處理態(tài)合金的。Zr在鑄態(tài)合金中的強(qiáng)化作用主要是細(xì)晶強(qiáng)化，而合金經(jīng)T6熱處理后，固溶強(qiáng)化以及Al3Zr粒子和θ?相的彌散強(qiáng)化是主要強(qiáng)化機(jī)制，擠壓鑄造可以顯著改善Al3Zr粒子的彌散強(qiáng)化效果。
The effect of Zr on the microstructures and mechanical properties of Al-5.0Cu-0.4Mn alloy prepared by squeeze casting was studied by tensile test, macro corrosion test, scanning electron microscopy (SEM), transmission electron microscopy (TEM), and took comparative analysis with the gravity cast alloy. The results show that the best tensile strength, yield strength and elongation are obtained for both the squeeze cast and gravity cast alloys in as-cast state when the Zr content is 0.25% (mass fraction). As for the heat-treated alloys, the tensile strength and yield strength increase when Zr content increases from 0 to 0.35%. However, the elongation reaches the maximum value when Zr content is 0.15%. Squeeze casting can significantly improve the elongation of the alloys with different Zr contents, but the improvement of the elongation of the as-cast alloys is significantly better than that of the heat-treated alloys. The dominant strengthening mechanism of Zr in the as-cast alloy is the grain refinement. However, the solid solution strengthening and dispersive strengthening of Al3Zr particles and q? phase are the main strengthening mechanisms in the alloy after T6 heat treatment. Squeeze casting can significantly improve the dispersion strengthening effect of Al3Zr particles.
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