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熱處理對(duì)Mg94Zn2Y4合金微觀組織與力學(xué)性能的影響
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濟(jì)南大學(xué),濟(jì)南大學(xué),濟(jì)南大學(xué),濟(jì)南大學(xué)

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TG146.2

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the Special Joint Funds of Natural Science Foundation of Shandong Province, China [ZR2013EML004]


Effect of heat treatment on microstructure and me-chanical properties of Mg94Zn2Y4 alloy
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University of Jinan,University of Jinan,University of Jinan,University of Jinan

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    摘要:

    研究了在773 K、48h 條件下熱處理對(duì)Mg94Zn2Y4合金的微觀組織與力學(xué)性能的影響。研究結(jié)果表明，塊形和板條結(jié)構(gòu)的18R 長(zhǎng)周期堆垛結(jié)構(gòu)相可直接從熔體凝固過(guò)程中形成。熱處理后，絕大多數(shù)的塊形和板條結(jié)構(gòu)相轉(zhuǎn)變?yōu)榧?xì)片狀或針狀的14H相。在熱處理過(guò)程中，有相當(dāng)體積分?jǐn)?shù)的 LPSO（長(zhǎng)周期堆垛結(jié)構(gòu)）相由 18R 轉(zhuǎn)變?yōu)?14H。結(jié)果還表明，經(jīng)過(guò)熱處理，塊形和板條結(jié)構(gòu)相與針狀相可以在 α-Mg 基體中共存，并作為影響因素，使合金晶粒得到細(xì)化，晶粒尺寸為14-24 μm（平均晶粒尺寸為19 μm），使極限拉伸強(qiáng)度、屈服強(qiáng)度以及伸長(zhǎng)率分別由鑄態(tài)時(shí)的 182 MPa、135 Mpa 和 10.2% 提高至 245 MPa、157 MPa 和 13.8%.

    Abstract:

    In the present work, the effect of heat treatment at 773 K for 48h on microstructure and mechanical properties of as-cast Mg94Zn2Y4 (at.%) alloy has been investigated. The results showed that block shaped and laths structures 18R long period stacking ordered (LPSO) phase forms directly from the melt. After heat treatment, vast majority of the block shaped and laths structures LPSO phase changed into fine lamellar or needle-like shaped 14H. During heat treatment, a great fraction of LPSO phase was transformed from 18R structure to 14H type. Both 18R and 14H can co-exist within the α-Mg matrix after solution treatment. As a result, with grain sizes of 14-24 μm (the average grain size is about 19 μm), the co-existence of the block shaped and laths structures phase and needle-like shaped phase helps to improve the ultimate tensile strength, yield strength and elongation from 182 MPa, 135 Mpa and 10.2% in as-cast alloy to 245 MPa, 157 MPa and 13.8%, respectively.

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許敏,滕新營(yíng),楊超平,張金洋.熱處理對(duì)Mg94Zn2Y4合金微觀組織與力學(xué)性能的影響[J].稀有金屬材料與工程,2016,45(11):2804~2808.[xu min, teng xin ying, yang chao ping, zhang jin yang. Effect of heat treatment on microstructure and me-chanical properties of Mg94Zn2Y4 alloy[J]. Rare Metal Materials and Engineering,2016,45(11):2804~2808.]
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  • 收稿日期:2014-07-30
  • 最后修改日期:2014-09-11
  • 錄用日期:2014-10-30
  • 在線發(fā)布日期: 2016-12-08
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