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Ti49.8Ni50.2合金絲材的熱機(jī)械循環(huán)疲勞和相變研究
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國(guó)家自然科學(xué)基金資助項(xiàng)目(50471021)


Thermo-Mechanical Cycling Fatigue and Transformation Behavior of Ti49.8Ni50.2 Alloy Wire
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    摘要:

    研究了熱處理對(duì)Ti49.8Ni50.2合金絲材的相變、力學(xué)性能以及熱機(jī)械循環(huán)疲勞的影響。結(jié)果表明：隨著退火溫度的升高，R→B19′相變溫度升高，B2→R相變溫度降低，873 K退火時(shí)B2→R和R→B19′相變重合。當(dāng)退火溫度(Ta)低于823 K時(shí)，試樣處于回復(fù)階段，σM隨退火溫度升高有小幅度下降，723 K退火試樣在熱機(jī)械循環(huán)中獲得最大穩(wěn)定回復(fù)應(yīng)變， 疲勞壽命隨退火溫度的升高略有提高；退火溫度高于823 K時(shí)，試樣發(fā)生再結(jié)晶，σM劇烈下降，穩(wěn)定回復(fù)應(yīng)變劇烈降低，而疲勞壽命由103升至104數(shù)量級(jí)

    Abstract:

    The effects of heat treatment on transformation behavior, properties and thermo-mechanical cycling fatigue of Ti49.8Ni50.2 alloy wire were investigated. With increasing of annealing temperature, R→B19′ transformation temperatures increase, while B2→R transformation temperatures decrease. The two transformations temperatures will overlap upon annealing at 823 K. Recovery occurs in the specimen annealed below 823 K, σM decreases slightly with the increase of annealing temperature, The specimen annealed at 723 K shows the largest stable recovery strain while its upon annealing above 823 K, the recrystallization of the specimen will occur, its σM and stable recovery strain decrease sharply, while its fatigue life increases from 103 to 104 magnitudes

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譚 冀,李艷鋒,高寶東,米緒軍. Ti49.8Ni50.2合金絲材的熱機(jī)械循環(huán)疲勞和相變研究[J].稀有金屬材料與工程,2009,38(5):784~787.[Tan Ji, Li Yanfeng, Gao Baodong, Mi Xujun. Thermo-Mechanical Cycling Fatigue and Transformation Behavior of Ti49.8Ni50.2 Alloy Wire[J]. Rare Metal Materials and Engineering,2009,38(5):784~787.]
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  • 收稿日期:2008-05-19
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