【摘要】：研究了Nd含量對(duì)活塞用Al-Si合金的組織演變和力學(xué)性能的影響。通過(guò)金相顯微鏡(OM)、掃描電子顯微鏡(SEM)分析了Nd對(duì)該合金凝固過(guò)程中析出相的形貌和分布的影響。并對(duì)其力學(xué)性能進(jìn)行了測(cè)試研究。結(jié)果表明:當(dāng)Nd含量≤0.3%時(shí),隨著Nd含量的增加,α-Al基體得以細(xì)化。在Nd含量0.3%時(shí),初生硅的等積圓直徑較未添加Nd時(shí)減小了73%,當(dāng)Nd含量增加至0.8%及以上時(shí),合金中出現(xiàn)了富稀土相,其力學(xué)性能顯著降低。Nd含量為0.3%的Al-Si合金的350℃抗拉強(qiáng)度較未添加Nd的Al-Si合金提高了29.8%。由于Nd元素聚集在AlCuNi相周?chē)?造成了成分過(guò)冷,抑制了AlCuNi相的長(zhǎng)大,AlCuNi相由粗大的骨骼狀轉(zhuǎn)變?yōu)榧?xì)小的棒狀。
[Abstract]:The effect of Nd content on microstructure evolution and mechanical properties of Al-Si alloy for piston was studied. The effect of Nd on the morphology and distribution of precipitated phases in the solidification process of the alloy was analyzed by (OM), scanning electron microscope (SEM). The mechanical properties were tested and studied. The results show that when the content of Nd is 鈮，

本文編號(hào)：2303992