本文選題：鋁硅銅錳合金 + 顯微組織　； 參考：《鑄造技術(shù)》2017年11期

【摘要】：通過顯微組織觀察和高溫力學(xué)性能測,試研究了Mn含量對近共晶Al-12%Si-4%Cu-x%Mn合金組織與耐熱性的影響。結(jié)果表明,隨著Mn含量的增加,鋁硅銅錳合金鑄態(tài)組織中的Al15Mn3Si2相數(shù)量不斷增多,且初生Al15Mn3Si2相的形態(tài)逐漸從小的塊狀及不發(fā)達(dá)的樹枝狀,轉(zhuǎn)變?yōu)榘l(fā)達(dá)的樹枝狀和細(xì)桿狀。同時發(fā)現(xiàn),添加元素Mn的S2(0.8%Mn)、S3(1.2%Mn)、S4(1.6%Mn)合金室溫和高溫抗拉強(qiáng)度均高于S1合金,說明在Al-12%Si-4%Cu合金中引入的富錳相Al_(15)Mn_3Si_2是有利于改善合金耐熱性的,并且隨著富錳相數(shù)量的增加,合金的高溫抗拉強(qiáng)度不斷增加。但S5(2.0%Mn)合金中的初生Al15Mn3Si2相大部分呈現(xiàn)發(fā)達(dá)的樹枝狀和細(xì)桿狀,脆性很大,耐熱性能反而不如S1合金的。
[Abstract]:The effect of mn content on the microstructure and heat resistance of near eutectic Al-12Si-4 alloy and Cu-xMn alloy was studied by means of microstructure observation and high temperature mechanical properties measurement. The results show that with the increase of mn content, the number of Al _ 15mn _ 3Si _ 2 phase in the as-cast structure of Al-Si-Cu-Mn alloy increases continuously, and the morphology of the primary Al _ 15mn _ 3Si _ 2 phase changes from small block and undeveloped dendriform to developed dendriform and fine rod shape. At the same time, it is found that the tensile strength at room temperature and at high temperature of S _ 2O _ (0.8) and S _ (3N) _ (1.2) mn + mn ~ (2 +) alloy is higher than that of S _ (1) alloy at room temperature and at high temperature, which indicates that the Mn-rich phase Alnn _ (15) and mn _ (3Si) _ 2 introduced in Al-12Si-4Cu alloy is beneficial to improve the heat resistance of the alloy, and with the increase of the number of manganese rich phases, The high temperature tensile strength of the alloy is increasing. However, most of the primary Al _ 15mn _ 3Si _ 2 phases in S _ 5 ~ (2. 0) / mn _ (2) alloy have developed dendriform and fine rod shape, and the brittleness is very large, but the heat resistance of the alloy is not as good as that of S1 alloy.
【作者單位】： 東南大學(xué)材料科學(xué)與工程學(xué)院江蘇省先進(jìn)金屬材料高技術(shù)研究重點(diǎn)實(shí)驗室;瑞聲科技(常州)有限公司;南通環(huán)本制冷設(shè)備有限公司;
【基金】：江蘇省先進(jìn)金屬材料高技術(shù)重點(diǎn)實(shí)驗室創(chuàng)新科研課題資助項目(BM2007204) 東南大學(xué)基本科研業(yè)務(wù)費(fèi)科學(xué)研究基金資助項目(2242016K40011)
【分類號】：TG146.21

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