2Si,Ca主要以固溶的形式存在；Si和Ca有一定的晶粒細(xì)化效用。2)隨著凝固速率增加,AZ91-1.5Si-0.4Ca中的Mg2Si相由粗大的多邊形及漢字狀向細(xì)小的多邊形顆粒及短棒轉(zhuǎn)變。3)隨著凝固速率增加,兩種合金試樣的常溫和高溫力學(xué)性能提高,AZ91-1.5Si-0.4Ca常溫和高溫強(qiáng)度受凝固速率影響大于AZ91,伸長(zhǎng)率受凝固速率影響則小于AZ91。當(dāng)壁厚低于2.5mm時(shí),AZ91-1.5Si-0.4Ca的中溫強(qiáng)度高于AZ91；當(dāng)壁厚低于3mm時(shí),AZ91-1.5Si-0.4Ca的常溫強(qiáng)度高于AZ91。"/>

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凝固速率對(duì)壓鑄態(tài)AZ91-1.5Si-0.4Ca鎂合金組織和性能的影響
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重慶大學(xué) 材料科學(xué)與工程學(xué)院,重慶大學(xué) 材料科學(xué)與工程學(xué)院,重慶大學(xué) 材料科學(xué)與工程學(xué)院,重慶大學(xué) 材料科學(xué)與工程學(xué)院,南充兆慶機(jī)械制造有限公司

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重慶大學(xué)大型儀器設(shè)備開放基金(項(xiàng)目號(hào)201512150010.)


Effect of solidification rate on microstructure and mechanical properties of die casting AZ91-1.5Si-0.4Ca magnesium alloy
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College of Materials Science and Engineering,Chongqing University,College of Materials Science and Engineering,Chongqing University,College of Materials Science and Engineering,Chongqing University,College of Materials Science and Engineering,Chongqing University,Nanchong Zhaoqing Machinery Manufacturing Co,Ltd

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    摘要:

    以AZ91-1.5Si-0.4Ca為對(duì)象(以AZ91為參照),通過(guò)設(shè)計(jì)并壓鑄成型4種厚度的板狀試樣獲得了4個(gè)凝固速率。首先對(duì)各壁厚試樣的凝固速率進(jìn)行了數(shù)值模擬,并對(duì)兩種合金試樣的顯微組織、常溫和180℃高溫拉伸性能、拉伸斷口形貌進(jìn)行了對(duì)比研究。結(jié)果表明：1)AZ91-1.5Si-0.4Ca中的Si與Mg生成Mg2Si,Ca主要以固溶的形式存在；Si和Ca有一定的晶粒細(xì)化效用。2)隨著凝固速率增加,AZ91-1.5Si-0.4Ca中的Mg2Si相由粗大的多邊形及漢字狀向細(xì)小的多邊形顆粒及短棒轉(zhuǎn)變。3)隨著凝固速率增加,兩種合金試樣的常溫和高溫力學(xué)性能提高,AZ91-1.5Si-0.4Ca常溫和高溫強(qiáng)度受凝固速率影響大于AZ91,伸長(zhǎng)率受凝固速率影響則小于AZ91。當(dāng)壁厚低于2.5mm時(shí),AZ91-1.5Si-0.4Ca的中溫強(qiáng)度高于AZ91；當(dāng)壁厚低于3mm時(shí),AZ91-1.5Si-0.4Ca的常溫強(qiáng)度高于AZ91。

    Abstract:

    Specimens of AZ91-1.5Si-0.4Ca and AZ91 with different section thicknesses were prepared by HPDC(high pressure die-casting). The solidification rate of the HPDC specimens was numerically simulated. The microstructure, tensile properties and the fracture morphologySat the ambient temperature and 180oC of the specimens were investigated. The results show that: 1) Si and Mg form Mg2Si phase and Ca mainlySdissolves in the matrix. Besides, Si and Ca have some effect of grain refinement on the Mg matrix. 2) The increase of solidification rate causes that the Mg2Si phase in AZ91-1.5Si-0.4Ca turn from bulky polygons and Chinese script type to fine polygons and short rod. 3)The mechanical properties of AZ91-1.5Si-0.4Ca and AZ91 at ambient temperature and 180oC increase with the increase of solidification rate. The influence of section thickness on tensile strength of AZ91-1.5Si-0.4Ca is greater than that of AZ91, but the influence on elongation is less than that of AZ91. Furthermore, the tensile strength of AZ91-1.5Si-0.4Ca at 180oC is higher than that of AZ91 when the section thickness is less than 2.5mm, and the tensile strength of AZ91-1.5Si-0.4Ca at ambient temperature is higher than that of AZ91 when the section thickness is less than 3mm.

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游國(guó)強(qiáng),明玥,閆鵬,馬小黎,童幫華.凝固速率對(duì)壓鑄態(tài)AZ91-1.5Si-0.4Ca鎂合金組織和性能的影響[J].稀有金屬材料與工程,2018,47(8):2392~2403.[YOU Guo-qiang, MING Yue, YAN Peng, MA Xiao-li, TONG Bang-hua. Effect of solidification rate on microstructure and mechanical properties of die casting AZ91-1.5Si-0.4Ca magnesium alloy[J]. Rare Metal Materials and Engineering,2018,47(8):2392~2403.]
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  • 收稿日期:2016-08-03
  • 最后修改日期:2016-09-14
  • 錄用日期:2016-11-10
  • 在線發(fā)布日期: 2018-10-17
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