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U-Ti合金的動態(tài)壓縮性能及剪切特征
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Dynamic Compression Performances and Adiabatic Shearing Characters of U-Ti Alloys
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    摘要:

    采用分段式霍普金森桿（SHPB）及材料試驗機(jī)測試200 ℃時效4 h的U-Ti合金在室溫下的動靜態(tài)壓縮力學(xué)性能，采用掃描電鏡和金相顯微鏡分析U-Ti合金動態(tài)壓縮后的絕熱剪切特征。結(jié)果表明，U-Ti合金是應(yīng)變速率敏感材料，產(chǎn)生了應(yīng)變速率強(qiáng)化效應(yīng)；當(dāng)應(yīng)變速率為3600 s-1時，U-Ti合金已經(jīng)發(fā)生45°剪切斷裂；當(dāng)應(yīng)變速率達(dá)到5000 s-1時，U-Ti合金剪切斷裂的同時產(chǎn)生燒蝕變形，剪切斷口上出現(xiàn)塑性金屬的韌窩特征；當(dāng)應(yīng)變速率為7300 s-1時，U-Ti合金45°剪切斷面上出現(xiàn)了重熔現(xiàn)象。

    Abstract:

    The quasi-static and dynamic compression mechanical performances of the U-Ti alloys aged at 200 oC for 4 h were tested by a mechanical equipment and Split Hopkinson Pressure Bar (SHPB) at room temperature. The adiabatic shearing characters of U-Ti alloys after dynamic compression were analyzed by SEM and OM. The results show that the U-Ti alloys are sensitive to strain rate because there is strengthening effect of strain rate. The 45o shear fracture had been yielded in the U-Ti alloys at the strain rate of 3600 s-1. Both the 45o shear fracture and ablative deformation were observed in U-Ti alloys when the strain rate reached 5000 s-1. Refusion phenomenon was found on the 45o fracture surface at the strain rate of 7300 s-1. The fracture morphology exhibits dimple character of plastic metal.

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劉婷婷,張鵬程,何立峰,白 彬. U-Ti合金的動態(tài)壓縮性能及剪切特征[J].稀有金屬材料與工程,2010,39(5):800~803.[Liu Tingting, Zhang Pengcheng, He Lifeng, Bai Bin. Dynamic Compression Performances and Adiabatic Shearing Characters of U-Ti Alloys[J]. Rare Metal Materials and Engineering,2010,39(5):800~803.]
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  • 收稿日期:2009-05-20
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