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退火處理對(duì)預(yù)變形Mg-5.3Nd合金壓縮強(qiáng)度的影響
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西安工業(yè)大學(xué)材料與化工學(xué)院,西安工業(yè)大學(xué)材料與化工學(xué)院,西安工業(yè)大學(xué)材料與化工學(xué)院,西安工業(yè)大學(xué)材料與化工學(xué)院,西安工業(yè)大學(xué)材料與化工學(xué)院

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國家自然科學(xué)基金資助(項(xiàng)目號(hào)51471123和51371132);國家自然科學(xué)基金項(xiàng)目（面上項(xiàng)目，重點(diǎn)項(xiàng)目，重大項(xiàng)目）


Annealing treatment on compress strength of pre-deformed Mg-5.3Nd alloy
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Xi'an Technlogical Unioversity,,,,

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    摘要:

    通過光學(xué)顯微鏡、XRD、SEM/EDS以及常溫壓縮試驗(yàn)等方法對(duì)Mg-5.3Nd合金的金相組織、退火強(qiáng)化行為以及壓縮變形機(jī)制等進(jìn)行了研究，結(jié)果表明：550 ℃×8 h固溶處理后，鑄態(tài)Mg-5.3Nd合金的第二相Mg12Nd基本消除。經(jīng)預(yù)壓縮-卸載-再壓縮試驗(yàn)，固溶Mg-5.3Nd合金的壓縮強(qiáng)度沒有明顯變化，而預(yù)壓縮-卸載-退火處理-再壓縮試驗(yàn)后，合金的壓縮強(qiáng)度明顯提高，并獲得最佳強(qiáng)化效果的退火工藝為180 ℃×4 h。原位金相分析發(fā)現(xiàn)，未退火試樣的再壓縮變形機(jī)制表現(xiàn)為預(yù)變形孿晶的明顯長大。而預(yù)變形試樣退火后，由于釹元素對(duì)預(yù)變形孿晶的釘扎作用，其再壓縮變形機(jī)制以新變形孿晶的形成為主。

    Abstract:

    The microstructure, annealing strengthen and compressive deformation mechanism of Mg-5.3Nd alloy were investigated by using of OM, XRD, SEM/EDS and room temperature compression test, the results showed that the main second phase on as-casting Mg-5.3Nd alloy was Mg12Nd and the optimal solution treatment was 550 ℃×8 h for eliminating the second phases. Not subsequent unload and recompression but annealling treatment between pre-compression and recompression could markedly increase the compression strength of pre-deformed Mg-5.3Nd solid solution and the optimal annealing process was 180℃×4 h to reach the strength increament of 47MPa. The in-situ optical micrographs indicated that the preformed twins in the pre-compressed Mg-5.3Nd alloy untreated by annealing obviously grew up during the subsequent compression, whereas after annealing treatment the second compression deformation proceeded by the initiation of the new twins rather than the growth of the prefromed ones for the diffusion segregation of Nd element in the twin grainboudary during annealing process.

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要玉宏,何益可,陳建,王偉,劉江南.退火處理對(duì)預(yù)變形Mg-5.3Nd合金壓縮強(qiáng)度的影響[J].稀有金屬材料與工程,2016,45(11):2999~3003.[Yao Yu-hong, He Yi-ke, Chen Jian, Wang Wei, Liu Jiang-nan. Annealing treatment on compress strength of pre-deformed Mg-5.3Nd alloy[J]. Rare Metal Materials and Engineering,2016,45(11):2999~3003.]
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  • 收稿日期:2016-06-22
  • 最后修改日期:2016-09-01
  • 錄用日期:2016-09-14
  • 在線發(fā)布日期: 2016-12-08
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