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高低溫循環(huán)對EW94鎂合金組織與力學性能的影響
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更新時間：2015-11-03
研究高低溫循環(huán)熱處理對EW94合金擠壓?T6態(tài)板材組織與力學性能的影響。
高低溫循環(huán)對EW94鎂合金組織與力學性能的影響Effects of high-low temperature cycle on microstructures and?mechanical properties of EW94 magnesium alloy
研究高低溫循環(huán)熱處理對EW94合金擠壓?T6態(tài)板材組織與力學性能的影響。結(jié)果表明：在(?196 ℃, 12 h)+(RT, 12 h)制度下，循環(huán)熱處理對合金的力學性能無明顯影響；經(jīng)(?196 ℃, 12 h)+(≤200 ℃, 12 h)循環(huán)熱處理N(N≤15)次后，樣品抗拉強度有所提高；經(jīng)(?196 ℃, 12 h)+(200 ℃, 12 h)循環(huán)4次后，樣品抗拉強度達到峰值，為413 MPa；經(jīng)(?196 ℃, 12 h)+(250 ℃, 12 h)循環(huán)處理后，樣品抗拉強度略有下降，伸長率略有提高；而經(jīng)(?196 ℃, 12 h)+(300 ℃, 12 h)循環(huán)處理后，樣品抗拉強度,急劇下降至307 MPa，但伸長率由2.8%提高到5.6%；隨循環(huán)次數(shù)的增加，合金力學性能基本保持穩(wěn)定。合金在高低溫循環(huán)過程中的相變是影響其力學性能的主要因素。
The effects of high-low temperature cycle on microstructures and mechanical properties of EW94 alloy with extruded-T6 temper were investigated. The results indicate that there is no effect on the mechanical properties when the aged alloy is held at ?196 ℃ and ambient temperature. There is some increment in ultimate strength of the alloy when it is treated by (?196 ℃, 12 h)+(≤200 ℃, 12 h) regime for N(N≤15) times, the maximum ultimate strength of 413 MPa is derived when the alloy was treated by (?196 ℃, 12 h)+(200 ℃, 12 h) for 4 times. There was some decrease in ultimate strength but some increment in elongation when treated by (?196 ℃, 12 h)+(250 ℃, 12 h). However, the ultimate strength abruptly decreases to 307 MPa and the elongation increases to 5.6% when the samples are treated by (?196 ℃, 12 h)+(300 ℃, 12 h), and the mechanical properties are stable at this level as the number of cycles increases. The phase transformation during the heat-treatment at alternate temperature is the key factor of the variation in mechanical properties.
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