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形狀記憶晶相/銅基非晶復(fù)合材料的組織和微觀力學(xué)行為研究
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蘭州理工大學(xué),蘭州理工大學(xué),蘭州理工大學(xué),蘭州理工大學(xué),蘭州理工大學(xué),蘭州理工大學(xué)

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國家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃（973計(jì)劃）


Microstructure and micro-mechanical properties of Cu based amorphous composites with shape-memory crystals
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Lanzhou University of Technology,Lanzhou University of Technology,Lanzhou University of Technology,Lanzhou University of Technology,Lanzhou University of Technology,Lanzhou University of Technology

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    摘要:

    本文采用懸浮熔煉-水冷銅模吸鑄法制備Cu50Zr42Al8錐形試樣，研究了合金不同直徑處的組織和微觀力學(xué)行為，分析了尺寸效應(yīng)和裂紋自愈合行為。結(jié)果表明，復(fù)合材料組織中包括非晶基體相、金屬間化合物AlCu2Zr相、奧氏體B2-ZrCu相和熱致馬氏體 B19’-ZrCu相。納米壓痕結(jié)果表明，單一非晶結(jié)構(gòu)的試樣心部硬而表面較軟，呈現(xiàn)越小越軟趨勢，而較大尺寸的非晶復(fù)合材料由于析出相的存在，心部軟而表面較硬。形狀記憶晶相由TRIP效應(yīng)對非晶基體增強(qiáng)增韌，而AlCu2Zr相析出使基體脆化。經(jīng)150 oC 10mins退火后，微觀壓痕產(chǎn)生的裂紋表現(xiàn)出自愈合行為。加載時，形變誘導(dǎo)B2奧氏體向B19’馬氏體相轉(zhuǎn)變并伴隨著體積的膨脹，而高于逆轉(zhuǎn)變溫度退火，B19’轉(zhuǎn)變?yōu)锽2相，體積收縮并驅(qū)動裂紋愈合。

    Abstract:

    Tapered Cu50Zr42Al8 alloy with good glass-forming ability were fabricated by copper mould suction casting. Cubic AlCu2Zr and B2-ZrCu, thermal-induced martensitic B19’-ZrCu phases form on the glass matrix along the radial direction structure. Size effects on micro-mechanical properties and a unique crack healing behavior were studied. Micro-hardness of monolithic BMG displays "smaller is softer" trend, that is, the softer surface and harder center. Whereas the lager size composites possess a softer center and harder surface, due to the integrative action of the secondary phases. Amorphous matrix is toughened by TRIP effect of shape-memory phase as well as weakened and embrittled by AlCu2Zr crystal. After annealed, self-heal of Vickers indentation crack occurs as the thermoelastic transformation of shape-memory crystals. As loading, stress-induced martensites transform from B2 to B19’, along with volume expansion. Annealed upon the reverse transformation temperature, B19’ to B2 transform accompanied by a volume shrinkage, and a restoring force is set up to drive the crack closure.

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袁小鵬,趙燕春,寇生中,趙志平,李春燕,袁子洲.形狀記憶晶相/銅基非晶復(fù)合材料的組織和微觀力學(xué)行為研究[J].稀有金屬材料與工程,2017,46(1):35~38.[yuanxiaopeng, zhaoyanchun, koushengzhong, zhaozhiping, lichunyan, yuanzizhou. Microstructure and micro-mechanical properties of Cu based amorphous composites with shape-memory crystals[J]. Rare Metal Materials and Engineering,2017,46(1):35~38.]
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  • 收稿日期:2014-09-14
  • 最后修改日期:2014-11-01
  • 錄用日期:2014-12-02
  • 在線發(fā)布日期: 2017-03-16
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