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題名 | The Effect of Cr Additions on the Mechanical Behaviors of Ni-19Si-(Nb,B)Alloy=添加鉻元素對Ni-19Si-(Nb,B)合金機械性能之影響 |
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作 者 | 鄭憲清; 曹春暉; | 書刊名 | 材料科學 |
卷期 | 25:4 1993.12[民82.12] |
頁次 | 頁317-320 |
分類號 | 440.39 |
關鍵詞 | 機械性能; 介金屬合金; 高溫; Mechanical behaviors; Intermetallic alloy; Elevated-temperature; |
語文 | 英文(English) |
中文摘要 | 經Cr元素添加後之Ni-19Si-(Nb,B)合金,利用抗拉試驗來探討其機械性質 之變化;並藉由X光繞射分析及掃描電子顯微鏡來檢測該合金的組織變化。研究結 果顯示該合金具有三種組織相,即α(fcc)相,β(L1��)相,及Nb�衹i�特i析出相。 當Cr的添加量超過1at時,將會急劇降低該合金的延性。另外,添加Cr的 Ni-19Si-3Nb-0.2B合金所表現的脆性破裂,推論其原因,可能是添加之Cr元素吸收 了部分B元素,因而降低了晶界的結合強度,導致脆性破裂。 |
英文摘要 | The mechanical properties of Ni-19Si-(Nb, B) poly crystals alloyed with Cr were investigated by tensile tests. The microstructures change varied by the additions of Cr also examined by x-ray diffraction, scanning electron microscopy. The results reveal that there are three phases, α(fcc) and β(L1��)phase, and one precipitate phase of Nb�衹i�特i existing in the cast Ni-19Si-3Nb-0.2B-xCr alloys. The effect of Cr additions in these alloys will decrease their ductility sharply when the additions of Cr exceed1.0 at.. Additionally, the brittle fracture behavior of the Ni-19Si-3Nb-0.2B alloy with Cr additionis presumably to be the effect of Cr element which consumes some part of B element, and reduces the adhesion of grain boundary of the matrix, then results in a brittle fracture. |
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